ChatGPT answers, unedited

For a two-person startup validating product-market fit, I’d start with Big Cartel.

• Big Cartel: $0/month for up to 5 products; very quick setup and no-code. Paid plan starts at $15/month. Big Cartel Big Cartel
• Square Online: $0/month, with payment processing fees; better if you also sell in person. Square Square
• Shopify: More powerful and scalable, but Basic is $29/month annually ($39 monthly), so I'd wait until you've validated demand. shopify.com

My pick: Big Cartel for the first MVP; Shopify once you're confident you need its larger ecosystem.

For a two-person startup testing product-market fit, I’d optimize for:

1. Launch in days, not weeks
2. Spend <$50/month before you have traction
3. Avoid engineering work
4. Be able to migrate or scale later

My default recommendation: start with Shopify unless your product is extremely simple. It is usually the best tradeoff between speed, reliability, checkout quality, and future flexibility. Shopify Shopify

Shortlist

Shopify WooCommerce## What I would choose by scenario

1. Physical consumer product (most startups)

Pick: Shopify

Examples:

• DTC apparel
• skincare
• gadgets
• food products
• accessories

Why:

• Payments, inventory, shipping, taxes, abandoned carts, and analytics are already handled.
• You can get a credible storefront running quickly.
• You won't need to rebuild after your first few hundred orders. Shopify

Minimal stack:

• Shopify
• Free theme
• Stripe/Shopify Payments
• Klaviyo or Shopify Email
• Google Analytics
• Customer support inbox

Avoid installing 20 apps early. They slow you down and obscure whether customers actually want the product.

2. You have 1–5 products and are mostly testing demand

Pick: Big Cartel or Shopify starter setup

Big Cartel is attractive when the goal is simply:

"Can strangers pay money for this?"

It is intentionally simple and has low upfront cost. Shopify

3. You already have a WordPress site

Pick: WooCommerce

WooCommerce can be inexpensive because the core software is free, but you trade money for maintenance: hosting, updates, plugins, security, and configuration. WooCommerce

For a two-person team trying to learn PMF, I would avoid this unless someone on the team already knows WordPress well.

What I would not do for PMF testing

• ❌ Build a custom storefront
• ❌ Hire a developer for checkout flows
• ❌ Spend weeks perfecting branding
• ❌ Add complex subscriptions/loyalty/referral systems before sales exist
• ❌ Optimize SEO before you know the product resonates

A lean validation setup

You could realistically launch with:

• Storefront: Shopify
• Domain: ~$10–20/year
• Theme: free
• Product photos: phone camera + simple editing
• Email capture: Shopify Email
• Analytics: Google Analytics
• Ads/testing: small daily budget

Your first goal is not a perfect ecommerce machine; it is answering:

• Will people click?
• Will they add to cart?
• Will they pay?
• Will they come back?

If you tell me what you’re selling (physical product, digital product, subscription, marketplace, B2B, etc.) and expected first-month order volume, I can narrow this to a specific stack.

For a two-person startup validating product-market fit, I’d optimize for speed and low commitment, not maximum features.

My pick: Shopify

Shopify is probably the best default for you.

• Minimal setup: hosted store, checkout, payments, inventory, shipping, analytics, and templates are all in one place.
• Cheap to test: Shopify currently offers 3 days free, then 3 months for $1/month; the Basic plan is $29/month when billed annually. Shopify Shopify
• You won't have to migrate later: if the experiment works, Shopify can grow with you instead of becoming throwaway infrastructure.
• Good for a tiny team: Basic gives you a full online store and unlimited products without needing developers. Shopify Help Center

shopify.com

But there are two cheaper options

Square's free tier can give you a hosted storefront without a monthly subscription, although payment processing still applies. Big Cartel's free tier is limited to five products. iTechGuides Shopify

What I'd do in your shoes

Start with Shopify Basic and spend almost nothing on customization.

Use:

• A free theme
• Shopify Payments
• Your own domain
• 1–5 products
• No paid apps initially
• Shopify's built-in analytics
• Simple product photography
• One clear landing/product page

The goal isn't to build a beautiful ecommerce operation. It's to answer "Will strangers give us money for this?"

Once you're getting meaningful sales, then worry about subscriptions, sophisticated email automation, CRO, custom design, etc.

One caveat: if you're literally testing with a handful of products and expect fewer than ~5–10 orders/month, I'd seriously consider Square Online's free tier first. The $29/month Shopify subscription is worthwhile mainly because it gives you a much better long-term foundation.

If you tell me what you're selling (physical vs. digital), roughly how many SKUs, expected monthly sales, and whether you already have a website/domain, I can narrow this down to the cheapest sensible setup for your specific PMF test.

Best default: shopify.com. For a two-person startup testing product-market fit, optimize for speed, not customization. Shopify has the easiest path from “idea” → “first orders” → scaling, with minimal technical maintenance. Shopify

My shortlist:

• shopify.com — Best overall. Fast setup, reliable checkout, lots of integrations. Use if you expect to keep selling. Shopify
• squareup.com — Cheapest/easiest for a tiny catalog or local selling; good if you already use Square payments. TechnologyAdvice
• bigcartel.com — Good for 1–10 simple products, especially handmade/creator products. Shopify
• woocommerce.com — Skip initially unless you already run WordPress; cheaper software but more setup and maintenance. Shopify

For PMF testing, I’d launch with:

1. Shopify starter/basic plan
2. One-page theme
3. 1–5 products
4. Stripe/Shopify Payments
5. No paid apps until customers demand them

Avoid building a custom store or spending weeks on branding before proving demand. Shopify

For a two-person startup validating product-market fit, I’d optimize for speed and low fixed cost, not maximum ecommerce features.

My pick: Big Cartel

bigcartel.com is probably the best fit if you have a small catalog and want to launch quickly.

• $0 to start on its limited free plan; paid plans start at $15/month. Big Cartel Big Cartel
• Very little technical setup—storefront, products, payments, and basic customization are built in.
• No Big Cartel transaction fee; you pay the payment processor's fee. Big Cartel
• The free plan supports up to 5 products, which is actually ideal for an early PMF experiment. Big Cartel
• You can move to a more capable plan once you know people actually want the product.

How I'd rank the alternatives

squareup.com has a genuine $0/month option with payment processing when you make sales. Square Square

shopify.com is the one I'd choose instead if you already expect to build a substantial ecommerce operation. Its current Basic plan is $29/month when billed annually ($39 monthly), with unlimited products and much more room to scale. Shopify

What I'd actually do

For PMF testing, don't spend a week building the store.

I'd launch with:

Big Cartel → 1–5 products → simple theme → Stripe/PayPal → one-page product descriptions → analytics → start driving traffic.

Your goal is to answer “Will strangers pay for this?”, not “Can we build the perfect ecommerce site?”

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly orders, and whether you need subscriptions, I can recommend the exact cheapest stack I'd use for the two of you.

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost + low maintenance, not maximum customization.

My pick: shopify.com

Shopify Basic is the best default if you expect the store to become a real business rather than a throwaway landing page. It gives you a full online store, unlimited products, checkout, inventory/order management, payments, and sales channels without needing to stitch together plugins. The current Basic price is $29/month when billed annually ($39 month-to-month). Shopify Shopify Help Center

For PMF testing, that's attractive because your two-person team can spend time on customers and distribution rather than website plumbing.

The shortlist

When I'd choose Ecwid instead

ecwid.com is worth a serious look if you're selling 10 or fewer products and want to spend as little as possible. Its Starter plan supports up to 10 products and is specifically positioned for beginners; you can also add the store to an existing website. Ecwid | E-Commerce Shopping Cart Ecwid Help Center

That's potentially the better choice if your experiment is essentially:

"Can we get 20–50 strangers to buy this?"

rather than:

"We're building the long-term ecommerce operation."

Ecwid's paid plans have also changed recently, so I'd check the current price at checkout rather than rely on older comparisons. Ecwid Help Center

What I'd do in your shoes

Start with Shopify Basic unless you have a very strong reason not to.

Keep the initial store brutally simple:

1. One good homepage.
2. One product/collection page.
3. Stripe/Shopify Payments-style frictionless checkout.
4. Basic email capture.
5. Analytics.
6. One acquisition channel.
7. Don't spend a week customizing the theme.

The goal of the first version isn't to build a beautiful ecommerce site. It's to answer "Will people actually pay?"

Shopify's current setup is particularly suited to this because you can start with a free trial and its current promotion is 3 days free followed by $1/month for 3 months. Shopify

Bottom line:

• Best overall: Shopify Basic
• Cheapest/simple MVP: Ecwid Starter
• Design-first brand: Squarespace
• Avoid initially: WooCommerce/custom builds

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly sales, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd actually use.

When I'd choose Ecwid instead

ecwid.com is worth a serious look if you're selling 10 or fewer products and want to spend as little as possible. Its Starter plan supports up to 10 products and is specifically positioned for beginners; you can also add the store to an existing website. ecwid.com support.ecwid.com

That's potentially the better choice if your experiment is essentially:

"Can we get 20–50 strangers to buy this?"

rather than:

"We're building the long-term ecommerce operation."

Ecwid's paid plans have also changed recently, so I'd check the current price at checkout rather than rely on older comparisons.

What I'd do in your shoes

Start with Shopify Basic unless you have a very strong reason not to.

Keep the initial store brutally simple:

For a two-person startup validating product-market fit, I’d optimize for speed, low fixed cost, and not having to rebuild later.

My pick: Shopify

Shopify is probably the best default if you expect to keep the business going beyond the initial experiment.

• Minimal setup: polished templates, hosting, checkout, payments, inventory, shipping, analytics, etc. are all integrated.
• Good enough for a real business: you won't have to migrate if you suddenly get traction.
• Current Basic pricing: $29/month when billed annually ($39 month-to-month), with online store functionality and unlimited products. Shopify Shopify Help Center
• Shopify is currently offering 3 days free, then $1/month for 3 months, though offers can change. Shopify

shopify.com

If minimizing cost is the #1 priority: Square Online

Square is compelling for PMF testing because its Free plan has $0/month subscription cost; you pay payment-processing fees when you sell. The U.S. plan includes a website builder, online checkout, shipping, and other basic ecommerce capabilities. Square

That's attractive if you're thinking:

"We don't even know whether anyone will buy this yet."

You can get a basic store live without committing to a monthly platform bill.

squareup.com

A third option: Ecwid

Ecwid is particularly nice if you already have a landing page and just want to bolt ecommerce onto it. Its Starter plan supports up to 10 products and lets you add a store to an existing website. Ecwid | E-Commerce Shopping Cart

ecwid.com

What I'd do in your situation

The important PMF point: don't spend a week building the store. Your ecommerce stack should be almost invisible to you. I'd spend 1–2 hours getting Shopify set up, use a stock theme, add only the products you're actually testing, and start driving real traffic.

If you're selling one or a handful of physical products, I'd choose Shopify. If you're literally trying to validate whether anyone will pay before spending money, I'd start with Square Free. Shopify Square

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and easy checkout—not maximum ecommerce functionality.

My pick: Square Online

Square is probably the best fit if you want to launch as cheaply and simply as possible.

• $0/month on Square Free; you pay processing fees when you sell. Square Square
• No coding required.
• You can build a basic storefront, add products, take payments, and handle fulfillment from one place. Square
• Particularly attractive if you're selling a relatively small catalog and don't yet know whether the business will work.
• You can upgrade later if you need more sophisticated ecommerce features.

squareup.com

The shortlist

Shopify is the better choice if you already know ecommerce is going to be a core part of the business. Its current Basic plan is $29/month when billed annually, with a full-featured online store and unlimited products. Shopify

shopify.com

Ecwid is another interesting option for an MVP. Its Starter tier supports up to 10 products and can be added to an existing website, although Ecwid's current paid pricing has moved up for the higher tiers. Ecwid | E-Commerce Shopping Cart Ecwid Help Center

ecwid.com

What I'd actually do

For PMF testing, don't spend a week building your store.

I'd launch:

Landing page → 3–10 products → Square checkout → email capture → analytics

Then spend the saved time on getting the first 50–100 customers.

Once you have evidence that people are buying, move to Shopify if you start needing things like advanced merchandising, apps, subscriptions, sophisticated abandoned-cart flows, or more elaborate marketing automation.

Bottom line: Square if your priority is "get something selling this weekend"; Shopify if your priority is "build the eventual ecommerce business now." Square Shopify

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost + easy iteration, rather than maximum ecommerce features.

My pick: Shopify

Shopify is probably the best default if you expect the product to gain traction.

• Very little technical setup: themes, checkout, payments, inventory, shipping, analytics, etc. are integrated.
• Good enough for a tiny MVP, but won't box you in if you start getting real traction.
• Basic is currently $29/month when billed annually ($39 month-to-month), with unlimited products and a full online store. Shopify Shopify Help Center
• Huge ecosystem of apps if you later need subscriptions, email/SMS, reviews, bundles, fulfillment, etc.
• Shopify is particularly attractive if you're selling physical products online and don't want to rebuild your stack six months from now.

shopify.com

But if you're really trying to spend almost nothing: Square

Square is the interesting alternative.

Its Free plan is $0/month and includes an online store, product catalog, inventory, payments, and basic website functionality. You pay transaction fees when you sell; Square currently lists 3.3% + $0.30 for online payments on its U.S. Free plan. Square Square

squareup.com

I'd choose Square if your goal is literally:

"Can we put 5–20 products online this weekend and see if strangers will pay?"

I'd choose Shopify if your goal is:

"We're testing PMF, but if this works, we want this same store to become the real business."

My recommendation for your situation

One important wrinkle: Shopify's old Starter plan isn't available to new stores, so I'd ignore older recommendations telling you to start there. Shopify Help Center

If it were my two-person startup, I'd spend the $29/month on Shopify and avoid building anything custom. The scarce resource at the PMF stage is founder time, not hosting money.

If you tell me what you're selling (physical product, digital product, subscription, marketplace, etc.) and roughly how many products, I can narrow this down to the best 2–3 options for your specific MVP.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and zero maintenance, rather than maximum ecommerce functionality.

My pick: bigcartel.com

Big Cartel is probably the best fit if you have a small catalog and want to launch quickly.

• $0/month on the free plan for up to 5 products. Big Cartel
• $15/month gets you up to 50 products, a custom domain, discounts, inventory tracking, shipping labels, and more. Big Cartel
• No Big Cartel transaction fee; you still pay the normal payment-processing fee. Big Cartel Big Cartel
• No coding or plugins required; Big Cartel says you can pick a template, add products, connect Stripe/PayPal, and have a working shop quickly. Big Cartel

For PMF testing, that's attractive because your store shouldn't become a project in itself.

The alternatives

squareup.com has a free plan with no monthly subscription; you pay processing fees when you transact. It's particularly compelling if you're also selling at markets, pop-ups, or a physical location. Square Square

shopify.com is the better choice if you already expect a fairly sophisticated ecommerce operation. Its Basic plan is currently $29/month when billed annually ($39 monthly), with a full online store, unlimited products, inventory, social/marketplace selling, etc. Shopify

One wrinkle: Shopify's Starter plan isn't available to new stores, so I wouldn't build your decision around that older recommendation. Shopify Help Center

What I'd do in your shoes

Start with Big Cartel at $0 or $15/month.

Keep the MVP extremely small:

1. Landing/store page
2. 1–10 products
3. Stripe/PayPal checkout
4. Basic shipping
5. Analytics
6. One domain
7. Nothing else

Don't spend two weeks customizing the store. Your objective right now is to answer “Will strangers pay for this?”, not “Can we build the perfect ecommerce infrastructure?”

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly sales, and whether you already have a website/domain, I can give you a very specific “use X, set it up this way” recommendation.

One wrinkle: Shopify's Starter plan isn't available to new stores, so I wouldn't build your decision around that older recommendation.

What I'd do in your shoes

Start with Big Cartel at $0 or $15/month.

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost + minimal maintenance, not maximum ecommerce features.

My pick: Shopify

Shopify is probably the best default if you expect the product to work and want to grow without rebuilding the store.

• Shopify Starter: about $5/month, good for selling through links/social channels rather than building a full storefront.
• Shopify Basic: about $29/month when billed annually (pricing can vary), and gives you the proper standalone store. Shopify Shopify
• Very little technical maintenance: hosting, checkout, payments, security, inventory, shipping, etc. are handled for you.
• Huge ecosystem if you later need subscriptions, email, analytics, reviews, fulfillment, etc.
• You can start extremely lean and add complexity only when customers prove they want the product.

shopify.com

But if you're really trying to spend almost nothing

Big Cartel is the interesting alternative.

• Free for up to 5 products
• $15/month for up to 50 products
• $30/month for up to 500 products
• No additional platform transaction fee, though payment processors still charge their normal fees. Shopify

bigcartel.com

It's excellent if you're selling a small number of SKUs. I'd choose it over Shopify for a PMF experiment where you have, say, 1–10 products and don't know whether you'll get 5 or 500 orders.

My shortlist

Square Online has a free tier, while Ecwid starts around $5/month; both can be attractive at very low sales volumes. Shopify Shopify

What I'd actually do

If I were the two founders, I'd start with Shopify Starter if we're primarily validating demand through social/content/ads, or Shopify Basic if we need a polished standalone storefront.

I would not spend time on WooCommerce, custom development, elaborate themes, or a dozen apps yet. Your objective at this stage is:

landing page → product → checkout → customer → feedback

The store should take hours, not weeks, to set up.

If you tell me what you're selling (physical/digital), approximate number of products, expected monthly sales, and whether you already have a website, I can tell you which of these I'd pick and what the cheapest practical stack would be.

For a two-person startup testing product-market fit, I’d optimize for speed + low fixed cost + enough functionality to learn, rather than building the “perfect” store.

My pick: Big Cartel

Big Cartel is probably the best fit if you have a small product catalog and want to get live with almost no technical work.

• $0/month on its Gold plan
• Up to 5 products
• No coding required
• Payments, basic variants, sales tax tools, and analytics included
• Big Cartel says you can launch in 30 minutes or less. Big Cartel Big Cartel
• If you validate the idea, its paid plan starts at $15/month and adds more products and selling features. Big Cartel

bigcartel.com

How I'd rank the alternatives

Square is particularly compelling if you also sell at markets/pop-ups: its Free plan has no monthly subscription, and the store can handle products, shipping, pickup, delivery, and Square POS integration. Square Square

squareup.com

Shopify is what I'd choose after PMF starts looking real. Its current Basic plan is $29/month when billed annually, with a much more extensive ecosystem and scaling capabilities. Shopify

shopify.com

One important update: don't choose Shopify just because you see recommendations for its $5 Starter plan. Shopify's own documentation currently says Starter isn't available to new stores. Shopify Help Center

What I'd actually do

For your stage, I'd launch:

Big Cartel → 1–5 products → Stripe/PayPal → simple domain → analytics → start selling.

Don't spend a week designing the store. Your goal is to answer “Will strangers pay for this?”, not “Can we build a beautiful ecommerce site?”

If you tell me what you're selling (physical/digital), roughly how many SKUs, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd use and estimate your monthly + per-sale costs.

For a two-person startup testing product-market fit, I would optimize for speed to first sale, not building the “perfect” store. Your goal is to validate demand with the fewest engineering hours and lowest fixed cost.

My shortlist:

Shopify TechnologyAdvice## My recommendation for your situation

If you are selling a physical product:

Start with Shopify.

Why:

• Fastest path from idea → checkout → customer feedback
• No server maintenance
• Strong payments, shipping, analytics, abandoned-cart tools
• Easy to migrate later if you outgrow it

A two-person team should spend its time on:

• customer interviews
• ads/landing-page tests
• product iteration
• fulfillment

—not debugging plugins.

Shopify LaunchAdvisor### If you have fewer than ~10 products and just need proof:

Try Square Online or Big Cartel.

They are good for:

• “Can strangers buy this?”
• preorder tests
• small drops
• handmade/limited inventory products

Let's Talk Shop Fit Small Business### I would avoid initially:

• WooCommerce unless one founder already knows WordPress. The software is free, but hosting, updates, plugins, and maintenance can become a distraction. Shopify
• Custom-built stores. Too much investment before validation.

A lean MVP stack I’d use

• Store: Shopify
• Payments: Shopify Payments + PayPal
• Email: klaviyo.com (or cheaper initially: mailchimp.com)
• Analytics: analytics.google.com
• Customer feedback: hotjar.com or simple surveys
• Support: tidio.com or email

The rule I’d use: if you cannot launch and accept your first order within a weekend, the stack is too complicated for product-market-fit testing.

If you tell me:

1. physical vs digital product,
2. expected number of SKUs,
3. whether you need subscriptions/preorders, and
4. your monthly budget,

I can narrow it to one choice.

For a two-person startup validating product-market fit, I’d optimize for speed, low fixed cost, and zero maintenance—not maximum customization.

My pick: shopify.com

Shopify is probably the best default if you expect the product to work and want to avoid rebuilding your store six months from now. Its hosted setup, payments, inventory, checkout, shipping integrations, analytics, and huge app ecosystem mean very little technical work. Shopify’s current entry points include a $5/month Starter plan and a full online-store Basic plan around $29/month when billed annually. Shopify Shopify

But there are two good reasons not to start with Shopify:

• Very few products / extremely early validation: bigcartel.com — free for up to 5 products, with paid plans starting around $15/month. It's deliberately simple and can be launched very quickly. Shopify Big Cartel
• You already use Square or sell in person: squareup.com — free monthly plan, though online payment fees are higher (reported at 3.3% + $0.30). Shopify

What I'd choose for PMF testing

The important distinction is that “free” isn't necessarily cheaper once you're selling. Transaction fees can quickly outweigh a $29 monthly subscription, and WooCommerce's apparent $0 software cost comes with hosting/plugins/maintenance. Shopify futurecommrce

My recommendation for your specific situation

Start with Shopify unless you literally have only a handful of products.

I'd spend one day getting the following live:

1. One clean landing/home page
2. 1–5 product pages
3. Shopify Payments
4. Shipping + tax settings
5. Basic email capture
6. Analytics
7. A custom domain
8. One checkout flow

Then stop working on the store and spend the rest of your time getting customers.

For PMF, you don't need a beautiful ecommerce operation—you need to discover whether people will click → trust → pay → come back.

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly sales, and whether you're US-based, I can recommend the cheapest setup and estimate your actual monthly cost at $1k, $5k, and $10k in sales.

For a two-person startup validating product-market fit, I’d optimize for speed and low fixed cost, not maximum ecommerce features.

My pick: shopify.com

Shopify Basic is the best overall choice if you expect the experiment to turn into a real business. It gives you a full online store, unlimited products, checkout, payments, inventory/order management, and a large ecosystem without needing to build anything yourself. The current Basic price is $29/month when billed annually (or $39 monthly). Shopify Shopify Help Center

For PMF testing, I'd actually value Shopify's maturity more than saving $10–20/month: you can launch quickly and avoid rebuilding your store if demand appears.

But if minimizing cost is #1

• bigcartel.com — probably the cheapest real storefront I'd consider. Its free plan supports up to 5 products, while the $15/month plan supports up to 50. Big Cartel doesn't charge transaction fees; payment processors charge their normal processing fees. Big Cartel Big Cartel
• squareup.com — excellent if you're also selling in person. Square has a $0/month Free tier, with online payment processing fees when you make sales. Square Square

What I'd choose

One important PMF principle: don't spend two weeks "building the store." Your first version should be something like landing page → product page → checkout → confirmation email. Spend the saved time talking to customers and driving traffic.

If you tell me what you're selling (physical/digital/subscription), approximate price, number of products, and whether you'll sell through Instagram/TikTok, I can tell you which one I'd use and the cheapest setup I'd build.

For a two-person startup testing product-market fit, I’d optimize for speed and low fixed cost, not maximum customization.

My pick: Square Online

squareup.com is probably the best fit if your priority is “get a real store live with almost no setup.”

• $0/month on Square Free; you pay processing fees when you sell. Square Square
• No coding required.
• Product catalog, checkout, payments, shipping/pickup, domain connection, and basic SEO are built in. Square
• You can start with a very simple one-page storefront rather than building a full website.
• Particularly attractive if you might sell at markets/pop-ups too, because Square connects online and in-person selling.

For PMF testing, I'd choose this if you're selling a relatively straightforward physical product.

Runner-up: Big Cartel

bigcartel.com is excellent if you have a small catalog and want a more independent/brand-oriented storefront.

• Starts at $0; the paid Platinum plan is $15/month. Big Cartel Big Cartel
• Very simple interface and designed around small businesses/creators.
• Paid plan supports up to 50 products, custom domains, inventory, shipping labels, discounts, etc. Big Cartel Big Cartel
• Big Cartel advertises 0% platform selling fees; normal payment-processing fees still apply. Big Cartel

I'd pick this over Square if brand presentation matters more than having a broader commerce ecosystem.

Shopify: best if you expect to stick with it

shopify.com is the one I'd choose if you already have evidence that the product is working and expect to build a serious ecommerce operation.

Shopify's current Basic plan starts at $29/month when billed annually ($39 monthly), with a full-featured online store, unlimited products, inventory, analytics, and a huge app ecosystem. Shopify

One important wrinkle: Shopify's $5 Starter plan isn't available to new stores, according to Shopify's current documentation. Shopify Help Center

What I'd do in your shoes

Recommendation: start with Square Online. Don't spend a week building the store. Get 3–10 products up, connect a domain, install analytics, and start driving actual customers to it.

Once you're seeing consistent demand, migrate to Shopify if you need more sophisticated marketing, subscriptions, apps, inventory, or checkout optimization.

If you tell me what you're selling (physical/digital, approximate price, and how many SKUs), I can give you a much more specific recommendation—including the cheapest setup I'd use for the first 100 customers.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and the ability to learn—not maximum customization.

My pick: bigcartel.com

If you have a small catalog, Big Cartel is probably the best fit for your stage.

• $0 to start on its limited free plan, with up to 5 products. Big Cartel
• Setup is deliberately simple: choose a template, add products, connect payments, and launch—no coding or plugins required. Big Cartel
• Its paid Platinum plan is $15/month if you need more products and features. Big Cartel
• Big Cartel says it charges 0% platform transaction fees; you'll still pay your payment processor's fees. Big Cartel

That's attractive when you're trying to answer "will people actually buy this?" rather than spending a week building your store.

How I'd rank the alternatives

squareup.com also has a $0/month Free tier, with payment processing fees when you sell. Square Square It's particularly compelling if you expect to sell both online and in person.

shopify.com is the one I'd choose after PMF. Its current Basic plan starts at $29/month when billed annually ($39 monthly), and it gives you a much more complete ecommerce system. Shopify Shopify's inexpensive Starter plan is no longer available to new stores, so I wouldn't build your decision around older recommendations for Shopify Starter. Shopify Help Center

What I'd actually do

Week 1: Big Cartel + Stripe/PayPal + your domain + one clean product page.

Don't build a sophisticated store yet. Get the minimum viable funnel:

Landing page → product → checkout → confirmation → customer feedback

If you're getting consistent sales and starting to need things like sophisticated inventory, abandoned-cart recovery, email marketing integrations, analytics, or lots of products, then migrate to Shopify.

If you tell me what you're selling (physical/digital), roughly how many SKUs, and whether you're expecting <$1k, $1–10k, or $10k+/month, I can tell you exactly which platform I'd use and what I'd pay for it.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and not getting trapped in a bunch of setup work.

My pick: Big Cartel

bigcartel.com is probably the best fit if you have a small catalog and primarily want to see whether people will buy.

• $0 to start, with the paid Platinum plan at $15/month after its trial. Big Cartel Big Cartel
• No transaction fee from Big Cartel itself; you pay the payment processor's normal fees. Big Cartel
• No-code setup and straightforward product/order management. Big Cartel
• Supports physical and digital products, shipping labels, inventory, discounts, and common payment methods. Big Cartel
• Crucially for PMF testing: you can get a real store live without spending much money or engineering time.

The alternatives

Shopify is the stronger long-term commerce platform—its Basic plan is currently $29/month when billed annually and includes unlimited products, online selling, inventory, multiple channels, etc. Shopify But for two founders trying to answer "Will anyone actually buy this?", I'd avoid paying for that infrastructure until you need it.

Square's free plan is particularly attractive if you're already using Square for physical sales; there is no monthly subscription cost on Square Free, with payment processing fees instead. Square

What I'd do in your shoes

Start with Big Cartel → launch in 1–2 days → don't overbuild.

Your initial stack could literally be:

• Store: Big Cartel
• Payments: Stripe/PayPal through the store
• Domain: your own domain
• Analytics: simple analytics + whatever you're already using for customer interviews
• Email: only add an email platform once you actually have leads/customers
• Support: one shared inbox

The goal at this stage isn't to build the "right ecommerce infrastructure." It's to get from "we think people want this" → "people actually paid us" as cheaply and quickly as possible.

One exception: if you're selling something with a more complicated catalog, subscriptions, lots of variants, international sales, or you expect hundreds of orders fairly soon, I'd start with Shopify instead. The extra $29/month is cheap insurance against rebuilding the store later. Shopify

If you tell me what you're selling, roughly how many SKUs, expected price, and whether it's physical/digital/subscription, I can recommend the exact cheapest stack for your situation.

For a two-person startup testing product-market fit, I would optimize for:

• Launch in days, not weeks
• Spend as little as possible before revenue
• Avoid custom development
• Keep the option to scale if you find traction

My default recommendation: start with Shopify unless your product type points elsewhere. It has the best balance of speed, checkout quality, payments, apps, and future growth. Shopify Shopify

Best options by situation

1. Best overall MVP store: shopify.com

Best for: Physical products, DTC brands, testing a real ecommerce business.

Why I’d pick it:

• Setup can be done in a weekend
• Hosting, checkout, security, inventory, payments, and analytics are handled
• Huge ecosystem if you later need subscriptions, email, reviews, shipping tools, etc. Shopify

Downside:

• Monthly cost is higher than ultra-lean options
• You may pay for features you don't need yet

Startup approach: Use a free theme, add 1–5 products, avoid apps until a customer problem appears.

2. Cheapest way to validate: squareup.com

Best for: Very early testing, local sales, simple catalogs.

Pros:

• Can start with low upfront cost
• Very simple setup
• Good if you also sell at events, markets, pop-ups, or in person

Cons:

• Less powerful ecommerce ecosystem than Shopify
• Better for simple stores than ambitious online brands Shopify

3. Best if you sell digital products: gumroad.com

Best for: Downloads, courses, templates, memberships, ebooks.

Pros:

• Almost no setup
• No need to build a full store initially

Cons:

• Not ideal for physical products
• Less control over brand experience Toolradar

4. Best if you already have a website: ecwid.com

Best for: Adding a small store onto an existing site.

Pros:

• Lightweight
• Good for a handful of products

Cons:

• Less of a full ecommerce operating system than Shopify Shopify

What I would avoid at the PMF-testing stage

• WooCommerce — powerful, but you become responsible for hosting, updates, plugins, and maintenance.
• Custom-built stores — almost always the wrong tradeoff before you know what customers want.
• Enterprise platforms — unnecessary complexity.

My suggested lean stack for a two-person startup

Physical product:

• Store: Shopify
• Payments: Shopify Payments
• Email: Klaviyo or Shopify Email
• Analytics: Google Analytics + Shopify analytics
• Customer support: email/chat only
• Reviews: add later after you have customers

Digital product:

• Gumroad or Shopify Digital Products
• Simple landing page
• Stripe/payment link testing first if demand is uncertain

A good rule: if you cannot describe your first store in one sentence (“We sell X to Y”), don’t spend time customizing the storefront yet. Your first goal is learning whether people buy.

If you tell me what you’re selling (physical product, digital product, subscription, marketplace, etc.) and expected first-month order volume, I can narrow this to a specific choice.

For a two-person startup trying to validate product-market fit, I’d optimize for speed, low fixed cost, and not getting locked into infrastructure.

My pick: Shopify

Shopify is probably the best default if you expect the experiment to turn into a real ecommerce business.

• Very little setup: products, checkout, payments, shipping, taxes, and hosting are integrated.
• Good enough for a tiny team: you don't need a developer or separate hosting.
• Easy to scale: you can add apps, channels, inventory, analytics, etc. later without rebuilding the store.
• The current Basic plan is $29/month when billed annually ($39 month-to-month), with unlimited products and a full online store. Shopify
• Shopify also currently advertises a 3-day free trial followed by $1/month for 3 months, though promotional terms can change. Shopify

shopify.com

If you want to spend almost nothing: Square

Square is the option I'd consider if your primary goal is "get a store live and see if anyone buys."

Square's Free plan has no monthly subscription cost; you pay processing fees when you make sales. It includes a website builder, products, payments, shipping/pickup/delivery options, and no-code setup. Square Square

The tradeoff is that I think Shopify gives you a better long-term ecommerce foundation.

squareup.com

One other interesting option: Ecwid

Ecwid is particularly attractive if you already have a website/landing page and just need to bolt ecommerce onto it. Its Starter plan supports up to 10 products, and Ecwid specifically positions it as a way to add a store to an existing site. Ecwid | E-Commerce Shopping Cart

ecwid.com

What I'd do in your shoes

The key PMF principle: don't spend your startup's scarce engineering time building ecommerce infrastructure. Spend it getting 10–50 customers and learning why they buy—or don't.

For a two-person team, I'd launch a very basic Shopify store in a day, use an off-the-shelf theme, put 1–5 products on it, and resist installing a pile of apps. Once customers are actually buying, then optimize conversion, fulfillment, subscriptions, email, analytics, etc.

If you tell me what you're selling (physical/digital), roughly how many products, and your expected first-month sales, I can recommend the cheapest setup—including payment fees and the point at which Shopify becomes cheaper than the alternatives.

For a two-person startup testing product-market fit, I’d optimize for speed and low fixed cost, not maximum flexibility.

My pick: bigcartel.com

It’s probably the best fit if you have a small catalog and want to get a store live without spending days configuring it.

• $0 to start on its limited free plan; paid plans start at $15/month. Big Cartel Big Cartel
• No Big Cartel transaction fee; you pay the normal payment-processor fees from Stripe/PayPal. Big Cartel
• Designed around simple storefronts rather than complex enterprise ecommerce.
• You can sell physical or digital products, manage inventory, discounts, shipping, etc. Big Cartel
• The setup is intentionally lightweight—Big Cartel says you can launch without coding. Big Cartel

For PMF testing, that's a feature: you don't want your team spending a week building the store before you've established that anyone wants the product.

When I'd choose something else

Shopify Square### The Shopify argument

If your product has a realistic path to becoming a substantial ecommerce business, I'd actually start with shopify.com despite the higher cost.

Shopify's current Basic plan is $39/month month-to-month or $29/month billed annually, and it includes the full online store, unlimited products, checkout, inventory, social/marketplace selling, and other infrastructure you'd otherwise have to bolt together. Shopify

The advantage is that you probably won't need to migrate later if the experiment works.

My rule of thumb

Use Big Cartel if:

"We need to sell 1–20 products and learn whether people will buy them."

Use Shopify if:

"We think this could become a real ecommerce operation and don't want to rebuild the stack in 6 months."

For a two-person team actively testing PMF, I'd start with Big Cartel unless you already know you'll need Shopify-specific functionality. Spend the saved money and engineering time on customer acquisition and learning instead.

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost, not maximum ecommerce functionality.

My pick: Big Cartel

bigcartel.com is probably the best fit if you have a relatively small catalog.

• $0 to start on its limited free plan, or $15/month for Platinum. Big Cartel Big Cartel
• No coding required; Big Cartel says you can get a functioning store running in an afternoon. Big Cartel
• 0% platform transaction fee; you still pay Stripe/PayPal processing fees. Big Cartel
• Product, inventory, payments, shipping, discounts and basic analytics are built in.
• The $15/month plan supports up to 50 products and adds things like custom domains, inventory tracking, shipping labels and discounts. Big Cartel

That makes it particularly attractive when your goal is "Can strangers actually buy this?", rather than building a sophisticated ecommerce operation.

When I'd choose something else

shopify.com is the one I'd pick instead of Big Cartel if you already know you'll need sophisticated apps, multiple sales channels, subscriptions, complex fulfillment, or a much larger catalog. Shopify's current Basic plan is $29/month when billed annually ($39 monthly), while its lighter Starter offering is designed for simpler selling. Shopify Shopify

What I'd actually do

For a PMF experiment, I'd keep the stack brutally simple:

Big Cartel + Stripe/PayPal + your existing domain + email analytics

Don't spend a week designing the store. Get 3–10 products, compelling product pages, checkout, analytics, and a clear way to contact you live. Then put your time into driving the first 50–100 potential customers to it.

If you tell me what you're selling (physical/digital), approximate number of SKUs, expected monthly sales, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd use for your specific startup.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and not having to rebuild later.

My pick: Shopify

Shopify is probably the best default.

• $5/month Starter if you mainly need simple product links/checkout and are selling through social, email, or an existing site.
• $29/month Basic (annual billing) when you want a proper standalone storefront.
• Hosting, checkout, payments, inventory, orders, shipping integrations, etc. are all in one place.
• The big advantage for a startup is that you can start extremely lean but don't have to migrate platforms if you find PMF. Shopify Shopify

shopify.com

If minimizing cost is the #1 priority

Ecwid's $5 Starter plan supports up to 10 products, while Square has a free plan but charges higher payment fees. Big Cartel's free tier is limited to five products. Shopify Zapier

ecwid.com
squareup.com
bigcartel.com

What I'd do in your shoes

Start with Shopify Starter if you're still validating the product itself. Don't spend a week designing a beautiful store. Put up:

1. One strong landing/product page
2. 1–3 products
3. Stripe/Shopify Payments checkout
4. Basic analytics
5. A custom domain
6. A simple email capture

Then, once you're getting consistent sales, move to Shopify Basic and invest in the storefront, email flows, reviews, upsells, etc.

The important PMF principle is: don't optimize the ecommerce stack before you've proven people want the product.

If you tell me what you're selling (physical vs. digital), roughly how many SKUs, and whether you're already using a website, I can tell you which option I'd choose and the cheapest setup I'd use.

For a two-person startup testing product-market fit, I’d optimize for speed to launch, low fixed cost, and not getting trapped in a complicated tech stack.

My pick: Shopify

Shopify is probably the best default if you expect the product to work and potentially become a real business.

• Setup: very low; templates + built-in checkout/payments
• Cost: Basic is currently $29/month when billed annually ($39 month-to-month), with online card rates starting at 2.9% + 30¢. www.shopify.com
• Scaling: excellent—you won't need to migrate platforms if PMF arrives.
• Marketing: strong integrations for email, ads, social, analytics, subscriptions, reviews, etc.
• Downside: $29/month is more than you need if you're literally just running an experiment.

Shopify pricing

If you're really trying to spend almost nothing

Big Cartel is particularly interesting for your situation: it has a free limited plan, while its current Platinum plan is $15/month and supports physical/digital products, shipping labels, inventory, discounts, and payment methods. www.bigcartel.com

Big Cartel pricing

Ecwid is another lightweight choice; its Starter tier is designed for beginners and supports up to 10 products, while higher tiers add things like custom domains, analytics, social selling, and abandoned-cart recovery. www.ecwid.com

Ecwid pricing

What I'd actually do

If you're testing whether people will pay, not whether you can build a beautiful store:

Shopify Basic → one simple theme → 3–10 products → Stripe/Shopify Payments → analytics → launch.

Don't spend a week customizing the store. Your first version should be good enough to answer:

Will strangers click → understand the offer → trust us → pay?

If you have fewer than ~10 products and expect to run the experiment for only a month or two, I'd seriously consider Big Cartel instead to minimize burn.

If you tell me what you're selling (physical/digital), approximate number of SKUs, expected monthly sales, and whether you already have a website, I can give you a very specific stack—including the cheapest payment/email/analytics setup.

For a two-person startup testing product-market fit, I’d optimize for speed to first sale, low fixed cost, and not getting trapped in technical setup.

My ranking

Shopify's current Starter plan is $5/month for lightweight/social selling, while the full Basic store is $29/month when billed annually. Basic gives you a complete hosted storefront, unlimited products, checkout, inventory, hosting, and SSL. www.shopify.com

What I'd actually do

Start with Shopify.

For PMF testing, the extra ~$24/month versus the Starter plan is usually worth it because you get a proper storefront rather than assembling a bunch of tools. You can launch with a free theme, connect your domain, add products, configure payments, and start testing demand without developers. www.shopify.com

If you literally have 1–5 products and are trying to spend $0 until you validate demand, I'd choose Big Cartel instead. Its free tier supports up to five physical products. www.shopify.com

I wouldn't use WooCommerce for this particular stage. Although the software is free, you'll be responsible for hosting and potentially plugins, updates, security, and maintenance—the exact work a two-person team probably doesn't need while trying to discover PMF. www.shopify.com

One important PMF principle

Don't overbuild the store.

I'd aim for:

Landing page → product → checkout → payment → confirmation

Then spend the team's time on traffic, customer interviews, conversion experiments, and retention, not custom storefront functionality.

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly sales, and whether you're already using Stripe/Square, I can tell you which platform I'd pick and the cheapest setup I'd use.

For a two-person startup testing product-market fit, I would optimize for speed to first sale, low operational overhead, and not getting trapped in a custom build. The “best” choice is usually not the absolute cheapest software — it’s the one that lets you spend your time talking to customers instead of maintaining a store. www.shopify.comwww.aversusb.net

My ranking:

www.shopify.com

My recommendation for a 2-person PMF test

Start with Shopify unless you have a strong reason not to.

Why:

• You can launch in a day or two.
• Checkout, payments, inventory, shipping, taxes, and analytics are already handled.
• You can add apps only when you have evidence you need them.
• Migrating away later is less painful than rebuilding a homegrown stack. www.aversusb.net

A lean MVP stack might be:

• Store: Shopify
• Payments: Shopify Payments or Stripe
• Email: Klaviyo or Shopify Email initially
• Analytics: Google Analytics + Shopify analytics
• Customer feedback: Typeform or a simple survey tool
• Support: email + chat widget only after customers appear

When I would choose something else

Choose Gumroad if you are selling:

• ebooks
• templates
• courses
• software downloads
• memberships

Choose Square Online if:

• you sell locally,
• you already use Square payments,
• you have a small inventory.

Choose WooCommerce only if one of you is already comfortable with WordPress, hosting, plugins, and maintenance. The “free” software can become expensive in founder time. www.shopify.com

What I would avoid during PMF testing

• Custom React/Next.js storefronts
• Headless commerce
• Expensive themes
• 20+ apps/plugins
• Building subscriptions, loyalty programs, complex automation before you have repeat customers

Your first goal is not a perfect store — it is answering: “Will strangers pay for this?”

If you tell me:

1. physical product vs digital product,
2. expected number of SKUs,
3. whether you need subscriptions, and
4. whether you already have a website/domain,

I can narrow this to a specific stack.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and not getting trapped in a bunch of setup work.

My pick: Shopify

shopify.com is probably the best default if you expect the product to work and want the store to grow with you.

• $5/month Starter if you mainly need simple product/checkout links and are selling through social, email, or DMs.
• $29/month Basic when you want a proper branded storefront. It includes unlimited products, hosting, checkout, inventory, and sales channels. Shopify Shopify
• Very little technical work.
• Huge ecosystem if you later need subscriptions, reviews, email, analytics, fulfillment, etc.
• The main downside for a PMF test is that you're paying a monthly fee before you've proven demand.

If you want to spend almost nothing: Square

squareup.com is the one I'd consider if your priority is "get something live for $0/month."

Square's Free plan has no monthly fee or startup cost; you pay processing fees when you sell. It includes a website builder, payments, shipping/fulfillment, and social selling. Square Square

It's particularly attractive if you're also going to sell at pop-ups, markets, or other in-person events.

What I'd choose

For PMF specifically, I'd avoid WooCommerce unless one of you already knows WordPress. It's technically cheap, but hosting, plugins, updates, payment configuration, and maintenance create exactly the kind of work a two-person startup doesn't need right now.

My recommendation: start with Shopify Starter if you're primarily validating whether people will buy; upgrade to Basic only once the storefront itself becomes important. Shopify currently offers a trial followed by $1/month for the first three months, which makes the initial experiment relatively inexpensive. Shopify

The key is not to spend a week building the store. For PMF, I'd aim for one product, one strong landing page, checkout, analytics, and start driving traffic—you can make the store beautiful after people demonstrate they want the product.

For a two-person startup testing product-market fit, I’d optimize for speed + low fixed cost, not maximum ecommerce sophistication.

My pick: Shopify

Shopify is probably the best default if selling online is the core of the product.

• Very little technical setup — hosting, checkout, payments, product catalog, orders, and inventory are all integrated.
• Easy to start small and add functionality later.
• The current Basic plan is $39/month month-to-month or $29/month billed annually. www.shopify.com
• You don't need to build a custom site or worry about servers.
• Its ecosystem is particularly useful once you start testing ads, email, subscriptions, fulfillment, analytics, etc. technologyadvice.cominterobservers.com

For PMF testing, I'd resist installing lots of Shopify apps initially. Start with the absolute minimum: product page → checkout → payment → fulfillment → analytics.

If keeping costs near zero matters more: Square Online

Square Online is worth serious consideration.

The Square Free plan has no monthly subscription cost; you pay payment-processing fees when you make sales. Square currently lists online payments at 3.3% + $0.30 on the Free plan. squareup.com

That's attractive if you're genuinely unsure whether you'll get any customers in the next few months.

Tradeoff: Shopify is the better long-term ecommerce platform; Square makes more sense when your priority is "let's get a checkout live this weekend for almost nothing."

Other good options

Current comparisons put Wix and Squarespace below Shopify in ecommerce depth, while Shopify is generally the strongest choice when the store itself is the business. technologyadvice.cominterobservers.com

What I'd do in your shoes

If you have <10 products and are primarily testing whether people will buy:
→ Square Online Free

If you expect the experiment to turn into a real ecommerce business if it works:
→ Shopify Basic

The important PMF principle is don't optimize for saving $20/month if it costs you hours of founder time. For a two-person team, that time is much more valuable than the platform subscription.

If you tell me what you're selling (physical/digital/subscription), roughly how many SKUs, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd actually use.

For a two-person startup validating product-market fit, I’d optimize for speed, low fixed cost, and enough functionality to learn—not for the platform you’ll use at $10M in revenue.

My pick: Big Cartel

Big Cartel is probably the best fit if you have a relatively small catalog.

• $0/month on its Gold plan, with up to 5 products. www.bigcartel.com
• No Big Cartel transaction fee; you pay the normal payment-processor fees. www.bigcartel.com
• Designed to get a store live very quickly, without coding. Big Cartel says its free store can launch in 30 minutes or less. www.bigcartel.com
• If the test works, $15/month gets you up to 50 products, custom domains, digital products, discounts, shipping labels, etc. www.bigcartel.com

That's unusually well aligned with "let's see if anyone actually buys this".

The shortlist

Square Online is particularly compelling if you need POS, pickup, delivery, or shipping: its free plan has no monthly fee and currently lists 2.9% + $0.30/transaction. squareup.com

Square Online

Shopify is the better choice if you already know ecommerce is going to be a major part of the business. Its current full-featured Basic plan is $39/month monthly or $29/month annually, while Shopify Starter is $5/month for a much more lightweight selling setup. www.shopify.com

Shopify

What I'd actually do

For PMF testing, I'd start with:

Landing page → Big Cartel checkout → Stripe/PayPal → analytics → customer interviews

Don't spend a week making the storefront beautiful. Spend that week getting 10–20 real people to attempt to buy.

If you tell me what you're selling (physical vs. digital), roughly how many SKUs, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd use for your specific startup.

For a two-person startup testing product-market fit, I’d optimize for speed to first sale, not maximum customization.

My pick: Shopify Starter

Shopify Starter is probably the best fit if you’re validating demand rather than building a full ecommerce operation.

• $5/month
• Extremely little setup
• Lets you sell through links, social media, messaging, and a simple storefront
• Shopify handles checkout, payments, orders, and basic product management
• Easy to upgrade to the full Shopify store later without migrating platforms
• Shopify currently advertises a trial/promo before the normal subscription. www.shopify.com

The important distinction: Starter is intentionally bare-bones. If you need a polished standalone ecommerce website with collections, extensive customization, etc., jump straight to Shopify Basic, currently $29/month when billed annually. www.shopify.com

Other good choices

Big Cartel is particularly compelling if you have a very small catalog: it's designed around independent creators and emphasizes straightforward setup. www.bigcartel.com

What I'd do in your shoes

Phase 1 — Validate
→ Shopify Starter
→ Buy a domain
→ Put up 1–5 products
→ Use your existing landing page/social/email to drive traffic
→ Don't spend time customizing the store

Phase 2 — You're getting repeat sales
→ Shopify Basic
→ Better storefront/navigation
→ Abandoned-cart recovery, richer analytics, apps, etc.

Phase 3 — Product-market fit
→ Start investing in branding, CRO, lifecycle email, inventory automation, subscriptions, integrations, etc.

The biggest mistake I'd avoid is building a beautiful ecommerce site before you've proven people want the product. For PMF testing, a $5/month Shopify setup that goes live tomorrow is substantially more valuable than a $30–100/month stack that takes two weeks to configure.

Bottom line: Start with Shopify Starter unless you're selling digital-only products (Gumroad) or have a tiny creator-style catalog (Big Cartel). Shopify gives you the lowest-friction path from "let's see if anyone buys this" to "holy crap, we're actually getting orders."

For a two-person startup testing product-market fit, I’d optimize for speed and low cognitive overhead, not maximum customization.

My pick: Shopify

Shopify is probably the best default if you're selling physical products and expect to keep the store if the experiment works.

• Minimal setup: hosted store, checkout, payments, inventory, shipping, analytics, etc. are all integrated.
• Good enough design out of the box: you don't need a developer to launch.
• Easy to iterate: add products, change pricing, run discounts, connect email/social channels, etc.
• Won't box you in: Shopify has a huge ecosystem if you discover PMF and need more functionality later.
• Current cost: Basic is $39/month monthly or $29/month billed annually; Shopify currently advertises a 3-day free trial followed by $1/month for three months. www.shopify.com

For an early startup, I'd actually consider the $39/month worthwhile because saving 5–10 hours of founder time is more valuable than saving $20/month.

If minimizing cost is the #1 priority

Square Online and several other platforms have free/low-cost entry tiers, but the tradeoff is generally less ecommerce depth and/or a less polished workflow. technologyadvice.com

What I'd do in your shoes

Don't build a "store." Build the smallest possible sales machine.

I'd launch with:

1. Shopify Basic
2. One clean theme
3. 1–5 products
4. Stripe/Shopify Payments
5. One domain
6. One strong product page
7. Basic email capture
8. Analytics + conversion tracking
9. One acquisition channel

And don't spend time on custom design, elaborate navigation, blogs, loyalty programs, dozens of apps, or sophisticated inventory management until customers actually demonstrate demand.

If you're selling a digital product, physical product, subscription, or something like a preorder, the recommendation changes somewhat. If you tell me what you're selling and roughly how many products/SKUs, I can tell you the cheapest setup I'd use and what I'd skip.

For a two-person startup testing product-market fit, I’d optimize for speed, low fixed cost, and not getting trapped in a complicated stack.

My pick: Shopify

Shopify is probably the best default if you expect the experiment to turn into a real business.

• Minimal setup: polished storefront, checkout, payments, inventory, shipping, analytics, etc. are integrated.
• Scales cleanly: you can start small and add apps/integrations later rather than rebuilding.
• Current pricing: Shopify Basic is $29/month when billed annually ($39 monthly), with online selling and unlimited products. www.shopify.com
• Shopify also has a $5/month Starter plan, but it's deliberately bare-bones and is better for selling through links/social channels than for building a conventional storefront. www.shopify.com

Shopify pricing

If you're really trying to spend almost nothing

Big Cartel is my favorite alternative for a tiny MVP. Its free Gold plan supports up to 5 physical products, online payments, a mobile-friendly storefront, and no Big Cartel transaction fee. The paid plan is $15/month for up to 50 products. www.bigcartel.com

Big Cartel

That's particularly attractive if you're testing one to five SKUs and don't need sophisticated marketing or fulfillment automation yet.

Another good option: Square Online

Square Online has a $0/month plan, with a website builder, shipping/pickup/local delivery, social selling, and payment processing. The current listed online processing rate is 2.9% + $0.30 per transaction. squareup.com

I'd choose it if you also expect to sell in person/pop-ups, because the Square ecosystem becomes particularly convenient there.

What I'd do in your shoes

For product-market-fit testing, I'd start with Shopify rather than over-optimize for saving $15–25/month. Your team's time is much more valuable than the subscription. The key is to avoid spending two weeks designing the store: use a stock theme, put up the minimum viable product pages, connect payments/shipping, and start driving customers to it.

If you tell me what you're selling (physical/digital), roughly how many SKUs, and whether you already have a website/domain, I can narrow this down to the cheapest setup I'd actually use.

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost, not maximum ecommerce functionality.

My pick: Shopify Starter

Shopify Starter is probably the best fit if you already have a landing page, social audience, or other place to send customers. It’s $5/month and is designed around lightweight selling rather than building a huge storefront. www.shopify.comwww.bigcartel.com

If you want a proper standalone store, I'd step up to Shopify Basic. It's $29/month when billed annually and gives you the full online store, unlimited products, inventory, checkout, and selling across channels. www.shopify.com

The alternatives I'd consider

Big Cartel is particularly compelling for a tiny catalog: its free Gold plan supports up to 5 products, online selling, cards/PayPal, tax automation, and basic stats. www.bigcartel.com

Square Online has a $0/month plan; you pay payment-processing fees when you sell. It includes a website builder, shipping/pickup, social selling, and multiple payment methods. squareup.com

What I'd do in your shoes

If you're testing one product or a handful of SKUs:

Shopify Starter → launch in a day → drive traffic → measure conversion → only upgrade once demand is proven.

Don't spend a week designing the store. For PMF, you primarily need:

1. Product page
2. Good photos/video
3. Clear value proposition
4. Checkout
5. Analytics
6. A way to collect customer emails/feedback

Once you're consistently getting sales, move to Shopify Basic and start investing in better merchandising, email marketing, retention, etc.

If you're selling only 1–5 products and want to spend literally $0/month, I'd choose Big Cartel instead. www.bigcartel.com

If you tell me what you're selling (physical/digital), roughly how many SKUs, and whether you already have a website/audience, I can narrow this down to one platform and the cheapest setup I'd use.

For a two-person startup testing product-market fit, I’d optimize for speed to launch, low fixed cost, and not getting trapped in setup work.

My pick: Shopify

Shopify is probably the best default if you expect the store to become a real business.

• Very little technical setup — templates, hosting, checkout, payments, inventory, shipping, etc. are built in.
• Good enough for a serious MVP without developers.
• Easy to add apps later for email, subscriptions, reviews, analytics, fulfillment, etc.
• If PMF appears, you don't have to migrate platforms.
• The current Basic plan is $29/month when billed annually ($39 month-to-month), with online selling and unlimited products. www.shopify.comwww.shopify.com
• Shopify currently offers 3 days free, then $1/month for 3 months, which is useful for an experiment. www.shopify.comwww.shopify.com

See Shopify's current pricing

But if you're really trying to minimize cost: Big Cartel

Big Cartel is worth considering if you have a small catalog and don't need sophisticated ecommerce features.

It has a $0-to-start plan, and Big Cartel says it doesn't charge transaction fees on orders; you still pay Stripe/PayPal processing fees. www.bigcartel.com

That's attractive for PMF testing because you can get a basic storefront running without committing to a monthly subscription.

The tradeoff is that Shopify gives you a much better runway if the experiment works.

What I'd choose

For your situation, I'd lean Shopify. The extra ~$29/month is trivial compared with the engineering/design/operations time saved, and you avoid a platform migration if you suddenly find PMF.

One important PMF principle: don't spend a week making the store beautiful. I'd use a stock theme, put up 3–10 products, connect payments, install only essential analytics, and start driving traffic. Your first goal is learning whether people will pay, not building the perfect ecommerce infrastructure.

If you tell me what you're selling (physical/digital), roughly how many SKUs, expected monthly sales, and whether you need subscriptions, I can narrow this down to the cheapest setup I'd actually use.

For a two-person startup testing product-market fit, I’d optimize for speed to launch + low fixed cost + easy checkout, rather than building the “perfect” store.

My pick: Shopify

If you expect to build a real ecommerce business, Shopify is probably the best default. The current Basic plan is $29/month when billed annually ($39 monthly), with a full online store, unlimited products, inventory, checkout, and social/marketplace selling. www.shopify.com

Why I'd choose it for PMF testing:

• Very little technical setup
• Excellent checkout and payments
• Easy to add/remove products as you iterate
• Lots of integrations if you discover you need email, subscriptions, fulfillment, analytics, etc.
• You won't have to migrate platforms if the experiment starts working

There's also Shopify Starter at $5/month, but it's deliberately bare-bones: it's mainly for selling through links, social media, and messaging rather than running a conventional storefront. help.shopify.com

If you want to spend basically $0: Big Cartel

Big Cartel's Gold plan is free, supports up to 5 physical products, accepts online payments, and has no Big Cartel transaction fee. www.bigcartel.com

I'd choose this if you're literally saying:

“We have 1–5 products and just need to see if strangers will pay.”

It's arguably the lowest-risk way to validate demand. Once you need more products, customization, integrations, or sophisticated growth tooling, Shopify becomes more attractive.

Another strong option: Square Online

Square has a $0/month Free plan with a website builder, payments, shipping, social selling, and Square POS integration. Its listed online payment rate is 2.9% + 30¢ per transaction. squareup.com

I'd pick Square particularly if you're also selling in person, at markets, pop-ups, retail events, etc.

What I'd do in your shoes

For a two-person PMF experiment, I'd start with Shopify unless you have ≤5 products and are extremely cost-sensitive. The extra ~$24/month versus Starter buys you a much more conventional storefront, and the bigger advantage is avoiding a platform migration if you suddenly find product-market fit. Current industry comparisons also consistently put Shopify at the top for ecommerce scaling. www.techradar.com

The bigger PMF principle: don't spend two weeks designing the store. Pick a theme, add the minimum viable product information, connect payments, and get the first 10–50 customers through the door.

For a two-person startup testing product-market fit, I’d optimize for speed and low fixed cost, not maximum customization.

My pick: Big Cartel

If you have 5 or fewer products, Big Cartel is probably the best fit. Its free Gold plan gives you a storefront, payments, tax tools, basic analytics, and up to 5 products. Big Cartel says you can launch in about 30 minutes, with no credit card required. www.bigcartel.com

That's particularly attractive for PMF testing because you can get a real checkout live without committing to a monthly software bill.

How I'd rank the options

Square Online is compelling if you're also selling at pop-ups, markets, or events: Square's Free plan has no monthly subscription and includes an online store, while you pay payment-processing fees when you sell. squareup.com

Shopify Starter is the option I'd choose if your initial sales are going to come primarily from Instagram/TikTok, email, DMs, or other channels rather than from people browsing a standalone store. Shopify currently lists Starter at $5/month, while its full Basic store starts at $29/month when billed annually. www.shopify.com

What I'd actually do

For a two-person team, I'd start:

Big Cartel → 1–5 products → custom domain → Stripe/PayPal → launch → talk to customers.

Don't spend a week tweaking the storefront. Your objective right now is to answer "Will strangers actually pay for this?", not build the perfect ecommerce infrastructure.

Once you're getting meaningful sales—or you need things like sophisticated inventory, subscriptions, lots of products, advanced analytics, or a larger app ecosystem—move to Shopify. Shopify's full platform is considerably more capable and scalable. www.shopify.com

Bottom line:

• 🥇 Big Cartel — best for cheapest + simplest PMF experiment
• 🥈 Shopify Starter — best for social-first selling
• 🥉 Square Online — best for online + physical selling
• Shopify Basic — best once PMF starts looking real

If you tell me what you're selling (physical/digital), roughly how many SKUs, and where you expect your first customers to come from, I can narrow this to one choice.

For a two-person startup validating product-market fit, I’d optimize for speed and low fixed cost, not maximum customization.

My pick: Shopify

Why: it’s probably the best balance of minimal setup now + not having to rebuild later. Shopify is specifically strong for ecommerce and scaling, and its current Basic plan includes a full online store, unlimited products, inventory, checkout, and social/marketplace selling. www.shopify.com

The catch: Basic is $29/month when billed annually ($39 monthly), so it's not the absolute cheapest way to test an idea. www.shopify.com

If you want to validate with the absolute minimum spend:

Shopify Starter is deliberately bare-bones: you can sell through links/social channels without building a complete ecommerce site. www.shopify.com

Square Online's free tier is attractive for validation because there's no monthly subscription, though its payment processing makes the "free" option less free as sales grow. www.shopify.com

What I'd actually do

If you're testing whether people will buy, I'd start with:

Landing page → Shopify Starter → Stripe/Shopify checkout → manually fulfill orders.

Don't spend a week designing a store. Get one compelling product page, 3–5 good photos, clear pricing, shipping/returns info, and checkout live as quickly as possible.

Once you're getting meaningful sales, move to Shopify Basic for the full storefront, better merchandising, analytics, inventory, etc.

I would not start with WooCommerce, Magento/PrestaShop, or a highly customizable stack. They're potentially cheaper in software fees, but your scarce resource right now is founder time, not hosting cost. Shopify itself notes that transaction costs can ultimately matter more than the monthly subscription as sales increase. www.shopify.com

Bottom line:

• $5/month experiment: Shopify Starter
• $0/month experiment: Square Online
• Best platform if you expect traction: Shopify Basic
• My choice for a two-person PMF test: Shopify Starter first, upgrade only after demand appears.

For a two-person startup testing product-market fit, I would optimize for:

1. Launch in days, not weeks
2. Spend almost no engineering time
3. Run experiments easily (pricing, landing pages, bundles, subscriptions, promos)
4. Avoid rebuilding if you get traction

My default recommendation: Shopify. It is usually the best tradeoff for a tiny team because the store, checkout, payments, hosting, security, inventory, and app ecosystem are already handled. www.forbes.comtechnologyadvice.com

My ranking for your situation

technologyadvice.com

What I’d do if I were a 2-person PMF team

Phase 1: Validate (first 30–90 days)

• Shopify starter theme
• 1–5 products max
• Stripe/Shopify Payments
• Basic analytics
• Email capture
• One landing page per customer segment
• Avoid custom development

Keep the stack tiny:

• Store: Shopify
• Analytics: Google Analytics + Shopify analytics
• Email: Klaviyo or Shopify Email
• Customer feedback: Typeform/Tally
• Support: email/chat widget

When I would not pick Shopify

Choose something else if:

• You are selling mostly through content/community and only need checkout → consider a lightweight checkout tool.
• You already have a WordPress site and a developer → WooCommerce can make sense.
• You are testing a single product with a very simple funnel → a landing-page-first tool plus checkout may be faster.

For a startup trying to answer “will anyone buy this?”, the biggest mistake is spending weeks perfecting the store. A simple Shopify store that gets 100 real customer transactions is more valuable than a custom ecommerce build that never launches. www.forbes.com

If you tell me:

• physical product vs digital product,
• expected number of SKUs,
• whether you need subscriptions,
• and your monthly budget,

I can narrow this to a specific stack.