ChatGPT answers, unedited

Yes. If the goal is a tiny, polished storefront you can show prospects without paying anything, I’d shortlist these:

• squareup.com — best “actually free” option. Square has a $0/month plan that lets you build and launch an online store; you only pay processing fees if someone actually buys something. Square
• bigcommerce.com — best for a convincing agency demo. You get a fully functional storefront for 15 days, with no credit card required. It’s an actual store rather than a restricted demo environment. BigCommerce
• WooCommerce — good if you already have WordPress hosting. The software itself is free, but hosting/domain costs mean it isn't truly $0 if you're starting from scratch.
• Big Cartel — worth considering for an extremely small catalog; it has a free tier, though it's deliberately limited.

What I'd use for an agency

If you want to keep the demo around indefinitely, use Square Online. You can create something like:

“Acme Coffee Co.” → 6 products → homepage → product pages → cart → checkout

and give prospects a real URL to click around, without paying a monthly platform fee.

If you want the demo to showcase more sophisticated ecommerce capabilities, I'd use BigCommerce's 15-day trial, build the demo, and screen-record the experience before the trial expires. BigCommerce

If you tell me what your agency sells (e.g. Shopify builds, web design, branding, AI/ecommerce) I can also recommend the best free setup specifically for a prospect-facing demo.

For an agency building a tiny prospect demo store (not a real merchant launch), I’d optimize for fast setup, realistic storefront experience, and zero cost. Good options:

For an agency sales demo, my shortlist would be:

1. Spree sandbox → best if you sell ecommerce builds, integrations, headless commerce, or custom development. spreecommerce.org
2. Wix → best if you need something a salesperson can customize in an hour and show a small business owner. www.wix.com
3. BigCommerce trial → best if prospects are larger brands and you want a recognizable SaaS platform. www.wix.comwww.bigcommerce.com

A common agency setup:

• Create a fake brand (“Acme Outdoor Supply”)
• Add 10–20 realistic products
• Add collections, discounts, reviews, abandoned cart emails, etc.
• Use a custom subdomain like demo.youragency.com
• Clone/reset the store between prospect meetings

If the goal is “we want one reusable demo storefront we can show dozens of prospects”, I’d lean toward Spree or an open-source platform hosted on a cheap/free tier rather than a time-limited trial. spreecommerce.org

Yes. For an agency demo storefront, I’d shortlist these:

1. Shopify Partner Development Store — best overall for agencies. Shopify lets Partners create free development stores specifically for building client stores and demos. They can have unlimited test orders/products, and Shopify explicitly supports using them as demo stores. Shopify Shopify

shopify.dev

1. Square Online — best if you just need a simple live storefront. Its Free plan has $0 monthly fees, a hosted store, products, checkout, and a free Square subdomain; you only incur processing fees if you actually take payments. Square

squareup.com

1. Big Cartel — easiest tiny mock store. Its free Gold plan allows 5 products, a storefront, checkout, and no credit card to start. That's plenty for a prospect-facing "here's what your store could look like" demo. Big Cartel

bigcartel.com

1. Ecwid — good for embedding a mini-store into an existing agency/demo site. It offers a free storefront/site builder and a free company.site domain. Ecwid | E-Commerce Shopping Cart

ecwid.com

My pick for an agency: Shopify Partner Development Stores. If the goal is to impress prospects with something that looks like a real ecommerce site—and potentially hand it over to the client later—it gives you the most convincing demo environment without paying for a live Shopify subscription.

If you want literally the fastest possible setup for a 5–10 product fake/demo catalog, I'd use Big Cartel instead.

Yes. If the goal is a tiny, convincing storefront for agency demos—not a real production shop, I’d shortlist these:

My pick: Square Online

Square's free tier lets you build and launch a hosted storefront with unlimited items, with no monthly fee. You only incur payment processing costs if you actually make a sale. squareup.com

That makes it particularly good for an agency: create something like brandname.square.site, load 5–10 fake products, customize the look, and send the prospect a working store.

If you literally want tiny

Big Cartel Gold is probably even simpler. It's $0 with no credit card, supports 5 product listings, checkout, variants, and basic stats. www.bigcartel.com

For a prospect demo such as:

Homepage → Product page → Cart → Checkout

I'd use Big Cartel if you only need a handful of products, and Square Online if you want the demo to feel more like a real small-business ecommerce site.

One caveat: WooCommerce itself is free, but you'd normally need hosting/WordPress infrastructure, so it isn't truly zero-cost unless your agency already has somewhere to run it. woocommerce.com

If you tell me whether you want (a) a disposable demo URL, (b) a white-label agency demo, or (c) something you can clone repeatedly for different prospects, I can narrow it to the best option.

Yes. If the goal is a tiny, polished storefront you can show prospects without paying a monthly fee, I’d shortlist these:

1. Square Online — best overall for a quick agency demo
   • $0/month plan
   • Hosted storefront, checkout, products, inventory
   • No setup/monthly fee; payment processing only if someone actually buys
   • Good enough to demonstrate a real ecommerce flow. squareup.com

2. Ecwid — best for a tiny catalog
   • Has a free Instant Site and can create a demo store without a credit card
   • Particularly good if you want to embed the store into an existing agency demo site
   • Free tier is intentionally limited, which is fine for a prospect demo. www.ecwid.com

3. Big Cartel — simplest standalone demo
   • $0 plan with 5 products
   • No credit card required
   • Very quick to get a basic storefront live. www.bigcartel.com

My pick for an agency: Square Online if you want the demo to feel like a legitimate ecommerce implementation; Ecwid if you want something you can drop into an existing demo website.

One caveat: “free” doesn't mean absolutely zero cost if you actually process a transaction—payment processing still applies. squareup.com

If you tell me whether you want the demo to look premium/agency-branded, Shopify-like, or as simple as possible, I can narrow it to one.

Yes. For an agency prospect demo, I’d shortlist these:

1. Shopify Dev Stores — best if you want a polished, convincing Shopify demo. Shopify provides free development stores specifically for building/testing themes, and you can generate test data. shopify.dev

2. Square Websites — easiest truly free hosted option. Square's Free plan has $0 monthly/startup fees, and you can build a full ecommerce site; you only pay processing fees if someone actually buys. squareup.com

3. Big Cartel — great for a tiny mock store. Its Gold plan is $0 with no credit card and allows 5 products, which is plenty for a prospect demo. www.bigcartel.com

4. Ecwid — good if the agency already has a marketing site. You can create a storefront and embed it into an existing site, with a free Instant Site option. www.ecwid.com

My pick for an agency: Shopify Dev Store if the point is to demonstrate what a real ecommerce build could look like. Square if the only requirement is “get something live at $0 and hand the prospect a URL.”

If you tell me whether the demo needs checkout/payment simulation, a custom domain, or just a pretty storefront, I can narrow it to the best one.

For an agency building a tiny storefront purely as a prospect demo, I’d pick Shopify development stores.

Best fit: Shopify Dev Store

Shopify Dev Stores

• $0 to create and keep for development/demo purposes.
• You can create unlimited development stores through Shopify Partners. shopify.dev
• Supports products, themes, checkout flows, apps, and unlimited test orders.
• Shopify can generate test/demo data for you, which makes it quick to populate a convincing storefront. shopify.dev
• You can use it as a prospect-facing proof of concept; Shopify explicitly describes dev stores as useful for building a store for a client. www.shopify.com
• Main catch: it's not a real production store—you can only use test payments, and the password page can't be removed in the normal dev-store setup. shopify.dev

If you need a genuinely public/free storefront

WooCommerce is another option: the software itself is free/open-source, but you'll need somewhere to host WordPress, so "zero spend" requires free hosting or running it locally. woocommerce.com

BigCommerce gives you a full store with no credit card, but it's only a 15-day free trial, so it's less suitable for keeping a standing agency demo around. woocommerce.comwww.bigcommerce.com

My recommendation: for an agency sales demo, use Shopify Partners → Development Store → Generate test data. It's probably the cleanest way to have a polished ecommerce demo that costs you nothing and can be reused for prospects.

Yes. For a tiny prospect-facing demo store with $0 spend, I’d shortlist these:

My pick: Square Online

Square Online has a genuinely free plan with no monthly fee or startup cost, and you can build a multi-page ecommerce site, add products, and publish it. You only pay processing fees if somebody actually buys something. squareup.com

For an agency, that's probably the easiest way to get something like:

demo.youragency.com → attractive storefront → 5–10 fake products → cart → checkout

without maintaining a server.

If you want the demo to showcase agency/developer capability

WooCommerce is better. The core platform is free and open source, with no monthly platform fee; the tradeoff is hosting. woocommerce.com Its free Storefront theme gives you a clean starting point. woocommerce.com

If you already have a cheap/free WordPress hosting environment, I'd actually choose WooCommerce because you can make the demo look much more bespoke.

BigCommerce is worth considering if the prospect is an enterprise-ish ecommerce client: its current trial is 15 days, no credit card, with the full platform, but it's not a permanent free storefront. www.bigcommerce.com

Bottom line:

• Need it online today with zero infrastructure: Square Online
• Need a reusable agency demo you can heavily customize: WooCommerce
• Need to impress a larger ecommerce prospect: BigCommerce trial

If you tell me whether the agency already has WordPress hosting/domain, I can narrow this to the easiest $0 setup.

For an agency demo store where the goal is “show prospects a working storefront without paying anything”, these are the strongest options:

My picks by use case:

• Need a reusable prospect demo URL: Spree Sandbox is probably the cleanest fit. You can spin up disposable stores and show both backend and storefront behavior. spreecommerce.org
• Need a “wow, this looks like a real merchant site” sales demo: Shopify trial or BigCommerce trial.
• Need something your agency can customize and reuse for many clients: WooCommerce or Spree.
• Need a demo in 10 minutes with zero technical work: use a hosted trial platform.

For an agency, I’d avoid building a fake HTML storefront unless the point is only visual design—the prospect usually gets more value seeing products, cart, checkout flow, admin orders, promotions, and inventory working.

Yes. For an agency building a tiny prospect/demo storefront with $0 upfront, I’d shortlist these:

My pick: Square Online if the goal is simply “here's a live store we built for you”. Its free tier has no monthly fee, lets you create a proper ecommerce site, and supports unlimited products. squareup.com

If it's literally a 5-product mock storefront and you don't need real checkout, Big Cartel is worth considering because its free tier is designed for very small catalogs. fitsmallbusiness.com

One important correction to older recommendations: Ecwid's free plan is no longer a safe recommendation for new accounts—a 2026 review reports that it ended free accounts for new signups in March 2025. fitsmallbusiness.com

If you tell me whether the agency wants (a) a fake/demo checkout, (b) real checkout, or (c) a highly polished Shopify-like demo, I can narrow it to the best 1–2 options.

For an agency demo store, Shopify is probably the best fit.

• Shopify Dev Stores — $0 for development/demo use, and you can create stores on Basic, Grow, Advanced, or Plus configurations. You can load products, customize the theme, and use test orders. Shopify says Partners can create unlimited development stores. shopify.dev
• Big Cartel Gold — genuinely $0 with no credit card, but limited to 5 products, so it's better for a very tiny mock storefront. www.bigcartel.com Big Cartel
• Square Online Free — $0/month, with payment-processing fees only if you actually take payments. Good if you want a simple live storefront rather than an agency development environment. squareup.com Square Online

My pick: Shopify Dev Store. For prospect demos, it looks and behaves much more like the kind of ecommerce site a client would actually buy, while costing the agency nothing. The main catch is that dev stores are password-protected and can't process real transactions. shopify.dev

If you tell me whether the demo needs to be publicly accessible to prospects without a password, I can narrow it down to the best free option.

For an agency wanting a tiny, convincing demo storefront at $0, I’d shortlist these:

1. Shopify development stores — best overall
   • Free for Shopify Partners/developers.
   • You can create unlimited development stores.
   • Add products, customize the theme, and run test orders.
   • Excellent if prospects are likely to know/use Shopify.
   • Main catch: the store is password-protected and can't process real transactions. shopify.devdocs.medusajs.com

2. Medusa — best if your agency is technical
   • Open-source commerce backend with a ready-made Next.js storefront.
   • Much more customizable than Shopify.
   • You can run the whole demo locally for essentially $0; hosting it publicly is the part that may introduce cost. docs.medusajs.com

3. Weebly — simplest no-code option
   • Has a free tier suitable for putting together a basic storefront, though ecommerce functionality is more limited than the paid tiers. www.techradar.com

My pick for an agency: Shopify dev store. You can make a polished little "Acme Coffee" or "Demo Apparel" shop, preload 5–10 products, customize the homepage, and give every prospect a realistic shopping experience without paying for a Shopify subscription. Shopify explicitly supports dev stores as demo environments. shopify.dev

If the goal is a public URL that prospects can click without entering a password, that's an important distinction—Shopify's free dev-store setup isn't ideal for that.

For an agency demo store (just something you can show prospects, with no budget), I’d look at these options:

For a sales/demo environment, I’d probably choose:

1. Spree Sandbox — if prospects are evaluating ecommerce platforms or your agency does custom builds.
2. Wix — if you want something visually impressive in an hour with minimal effort.
3. BigCommerce trial — if you’re pitching larger merchants and want a “real commerce platform” feel.

A good agency demo setup:

• Create a fake brand (logo, colors, 8–12 products)
• Add collections/categories
• Add a few reviews and discount codes
• Make a demo customer account
• Record a short walkthrough so every prospect sees the same flow

If you need the demo to be white-label (your agency branding, reusable for many prospects), I’d lean toward a headless/open-source option rather than a basic free builder.

For an agency building a tiny prospect-facing demo store at $0, I’d pick Shopify if the goal is to show prospects a polished, realistic commerce experience.

Best options

1. Shopify Dev Store — best overall
   • Free for Shopify Partners.
   • You can create unlimited dev stores.
   • Supports products, themes, cart, checkout/testing, etc.
   • You can populate it with generated test data.
   • Real payments aren't processed, but you can use Shopify's test gateway.
   • Great for making a reusable "here's what your store could look like" demo. help.shopify.commahocommerce.comshopify.dev

Create Shopify dev stores

2. Maho — best if you want genuinely open-source/free
   • Open-source, self-hosted ecommerce.
   • Has a ready-made live demo with storefront + admin.
   • You can run it locally or in your own infrastructure.
   • Less familiar to prospects than Shopify, though. mahocommerce.com

What I'd do for an agency

Shopify Partner → Dev Store → generated test data → customize a nice theme → give prospects the storefront URL + demo password.

That's probably the cleanest setup for a reusable agency demo. Shopify explicitly supports dev stores for testing and demonstrating themes/apps, and they're not time-limited like a normal free trial. help.shopify.com

One caveat: Shopify dev stores are password protected and can't process real transactions, which is actually fine for a prospect demo. help.shopify.commahocommerce.comshopify.dev

If you tell me whether you want the demo to be publicly viewable without a password or password-protected for sales prospects, I can narrow this down to the best 2–3 free options.