ChatGPT answers, unedited

If you mean B2B e-commerce / selling products or services to enterprise buyers, I’d shortlist BigCommerce and Shopify—but with an important distinction.

My pick: BigCommerce

BigCommerce is probably the strongest B2B-first value proposition for your situation.

Its B2B capabilities include company accounts, buyer roles/permissions, negotiated pricing, quoting, purchase orders, invoicing, approval workflows, sales-rep tools, and a dedicated buyer portal. docs.bigcommerce.com

The particularly attractive part for a startup is that you don't necessarily have to begin with an expensive enterprise implementation. BigCommerce's standard plans currently start at $29/month when billed annually, while its higher-volume Performance offering starts at $1,499/month; B2B Edition provides the more advanced functionality. www.bigcommerce.comchangelog.shopify.com

Shopify is worth considering too

Shopify has actually become much more interesting for startups in 2026. Shopify added several native B2B capabilities to its Basic, Grow, and Advanced plans, including company profiles, payment terms, volume pricing, ACH in the U.S., and up to three B2B catalogs—without an additional B2B fee. changelog.shopify.com

That's a very compelling way to start cheaply and upgrade only when your enterprise requirements justify it.

The catch is that some of the more sophisticated B2B functionality—such as unlimited catalogs, direct catalog assignment, partial payments and deposits—remains Plus-only. Shopify Plus starts at $2,500/month on a one-year term or $2,300/month on a three-year term. www.shopify.com

What I'd do as a startup

If enterprise procurement is central to your product from day one → BigCommerce.

If you're validating the market and want the lowest-risk starting point → Shopify, then move up as needed.

I'd avoid Adobe Commerce/Salesforce Commerce initially unless you already have unusually complex requirements or a large implementation budget. You're likely paying for capabilities you won't need yet.

If you tell me what you're selling (physical products, SaaS, services, marketplace, etc.) and roughly how enterprise customers buy from you, I can narrow this down to 2–3 platforms and compare pricing, SSO, approval workflows, invoicing/net-terms, CRM/ERP integrations, and implementation cost.

If you mean B2B ecommerce / a self-service enterprise purchasing portal, I’d shortlist BigCommerce and Shopify—with BigCommerce probably the better fit if B2B complexity matters more than having the cheapest possible starting point.

My pick: BigCommerce

For an enterprise-selling startup, BigCommerce gives you unusually good B2B functionality without forcing you immediately into an expensive enterprise contract. Its B2B Edition includes things like:

• Company accounts and account hierarchies
• Customer-specific pricing
• Quotes and negotiated pricing
• Purchase orders and invoice management
• Net payment terms
• Buyer approval workflows
• Sales-rep functionality
• Shared/requisition shopping lists
• A dedicated buyer portal BigCommerce BigCommerce

That means you can build a reasonably sophisticated enterprise purchasing experience without immediately assembling a stack of plugins.

BigCommerce's current paid plans start at $29/month for Core, $79/month for Growth, and $299/month for Scale when billed annually; its higher-volume Performance tier starts at $1,499/month. BigCommerce

When I'd choose Shopify instead

If you're selling both enterprise and consumer/direct customers, I'd lean toward Shopify. Its B2B capabilities have become much more accessible: Basic, Grow, and Advanced now include companies, payment terms, volume pricing, and up to three active B2B catalogs without an additional B2B fee. Shopify Help Center Shopify Changelog

The catch is that the more sophisticated B2B requirements—unlimited catalogs, customer-specific catalog assignment, deposits and partial payments—push you toward Shopify Plus, which is currently $2,500/month on a one-year term or $2,300/month on a three-year term. Shopify Help Center

Bottom line:

• B2B-first → BigCommerce
• B2B + D2C + easiest startup experience → Shopify
• Highly customized enterprise workflows → Adobe Commerce
• Already Salesforce-centric → Salesforce B2B Commerce

If you tell me what you're selling (SaaS, physical products, services, marketplace, etc.) and roughly how many enterprise customers you expect in year 1, I can narrow this down substantially.

If you're selling both enterprise and consumer/direct customers, I'd lean toward Shopify. Its B2B capabilities have become much more accessible: Basic, Grow, and Advanced now include companies, payment terms, volume pricing, and up to three active B2B catalogs without an additional B2B fee. Shopify Help Center changelog.shopify.com

The catch is that the more sophisticated B2B requirements—unlimited catalogs, customer-specific catalog assignment, deposits and partial payments—push you toward Shopify Plus, which is currently $2,500/month on a one-year term or $2,300/month on a three-year term.

Bottom line:

If you mean B2B ecommerce / a customer portal for selling to enterprise accounts, I’d put Shopify and BigCommerce at the top of the list for a startup.

My pick: Shopify

In 2026, Shopify became much more interesting for startups doing B2B: its Basic, Grow, and Advanced plans now include native B2B features at no extra cost, including company profiles, up to three B2B catalogs, volume pricing, payment terms, and vaulted cards. Shopify Shopify Changelog

That means you can start around $39/month on the monthly Basic plan—or $29/month billed annually—without immediately committing to Shopify Plus. Plus starts at $2,300/month on a three-year term. Shopify

shopify.com

BigCommerce is the other strong contender

bigcommerce.com has arguably deeper B2B functionality out of the box: company hierarchies, roles and permissions, quoting, purchase orders, invoices, net terms, sales-rep ordering, and a buyer portal. BigCommerce BigCommerce

Its standard plans currently start at $29/month annually, with higher tiers at $79 and $299; its enterprise/high-volume tier is custom. BigCommerce

How I'd choose

For a startup selling to enterprises, I'd start with Shopify Advanced rather than jumping straight to Plus. You can validate the sales motion with native company accounts, customer-specific pricing, catalogs and payment terms, then move to Plus only when you actually need its additional B2B controls. Shopify explicitly positions its B2B offering around launching quickly and reducing development costs. Shopify

One caveat: if you're not actually selling products online—for example, you're a SaaS startup needing enterprise CRM, account management, procurement workflows, contracts, and sales pipeline—I'd recommend a completely different stack. If that's your situation, tell me what you're selling and how enterprise customers buy it, and I can narrow it down to 3–4 platforms.

Assuming you mean B2B ecommerce / selling products to enterprise buyers, I’d shortlist Shopify and BigCommerce rather than jumping straight to Adobe Commerce or Salesforce Commerce Cloud.

My pick: Shopify

For a startup, Shopify is probably the best cost-to-capability tradeoff right now. In April 2026, Shopify moved substantial B2B functionality down to its Basic, Grow, and Advanced plans at no extra charge. That includes company profiles, payment terms, volume pricing, quantity rules, and up to three B2B catalogs. help.shopify.comwww.bigcommerce.com

You can therefore start relatively lean and move to Shopify Plus only when you actually need things such as unlimited catalogs, customer-specific catalogs, deposits/partial payments, or more sophisticated B2B customization. help.shopify.com

Shopify B2B documentation

BigCommerce: stronger B2B depth earlier

I'd consider BigCommerce if your enterprise sales process is more complex from day one. Its B2B Edition has native support for things like:

• company account hierarchies
• sales quoting
• purchase orders and net terms
• invoice management
• buyer approval workflows
• sales-rep workflows
• shared/requisition lists
• a dedicated Buyer Portal

Those are particularly useful if you're selling through procurement departments rather than simply offering wholesale pricing. docs.bigcommerce.com

BigCommerce's regular plans currently start at $29/month when billed annually, although its more advanced B2B/enterprise functionality is a different pricing tier. www.bigcommerce.com

BigCommerce B2B

How I'd choose

For a startup selling to enterprises, I'd start with Shopify unless your sales process already requires sophisticated quoting, procurement workflows, or account hierarchies. There's little reason to pay for an enterprise platform before you've proven that those capabilities are actually constraining sales.

If you tell me what you're selling (physical products, SaaS, services, etc.), typical contract size, and whether buyers need POs/net-30, quotes, SSO, or approval workflows, I can narrow this down to the best 2–3 platforms for your specific enterprise motion.

If you mean B2B ecommerce / a self-service enterprise buying portal, I’d shortlist Shopify and BigCommerce, with Shopify currently the strongest “start lean, scale later” option.

My pick for a startup: Shopify. In April 2026, Shopify made foundational B2B functionality available on its regular plans at no additional charge, including company profiles, up to three B2B catalogs, volume pricing, and payment terms. www.shopify.com

That means you can start without committing to a $2K+/month enterprise platform and upgrade to Plus later without replatforming. Plus adds things such as unlimited catalogs, direct assignment to companies/locations, deposits and partial payments. www.shopify.com

BigCommerce is the alternative I'd seriously evaluate if your sales process already involves quotes, purchase orders, approval workflows, complex account hierarchies, or buyer portals. Its B2B Edition has those capabilities built in, rather than relying as heavily on apps. www.bigcommerce.com

For a startup, I'd avoid Adobe Commerce, Salesforce Commerce Cloud, SAP Commerce, etc. unless you already have unusual enterprise requirements—they can make sense at scale but introduce substantially more implementation and ownership overhead. www.shopify.com

Rule of thumb:

• Want fastest/cheapest path to your first enterprise customers → Shopify
• Need sophisticated B2B workflows from day one → BigCommerce
• Need highly customized enterprise commerce architecture → Adobe/Salesforce/etc.

Shopify pricing · BigCommerce pricing

If you tell me what you're selling, typical contract/order size, and whether customers need quotes/POs/net-30, I can narrow this down to the best 2–3 options for your specific startup.

Assuming you mean B2B ecommerce/ordering, I’d shortlist Shopify and BigCommerce rather than jumping straight to Adobe/Salesforce.

My pick: Shopify

The big change in 2026 is that Shopify added core B2B functionality to its regular Basic, Grow, and Advanced plans. You can now have company profiles, up to three B2B catalogs, payment terms, volume pricing, ACH (US), and vaulted cards without paying for Plus. www.shopify.com

Its current Basic plan starts at $29/month when billed annually, so you can get started without a major platform commitment. www.shopify.com

That makes it particularly attractive for a startup selling to enterprises: you can build the sales/ordering infrastructure now and only move to Shopify Plus when you actually need things like unlimited catalogs, more sophisticated B2B customization, or enterprise-scale workflows. Plus currently starts at $2,300/month on a 3-year term. www.shopify.com

Shopify B2B overview

When I'd choose BigCommerce instead

I'd lean toward BigCommerce if your B2B sales model already requires more sophisticated pricing, buyer accounts, quoting, or wholesale workflows. Its current self-serve plans run from $29/month annually, while its Performance tier starts around $1,499/month and is aimed at higher-volume businesses. www.bigcommerce.com

BigCommerce pricing

Bottom line: For a startup, I'd start with Shopify Advanced unless you have unusually complex B2B requirements. Don't pay for Shopify Plus, Adobe Commerce, or Salesforce just because you're selling to enterprises—the sophistication of your procurement workflow matters much more than the size of your customers.

If you tell me your product type, typical deal size, number of SKUs, and whether customers need POs/net-30, custom pricing, quotes, or procurement-system integrations, I can narrow it to the best 1–2 platforms.

Assuming you mean B2B ecommerce / selling online to enterprise customers, I’d shortlist these:

My pick for a startup: Shopify

The biggest change in 2026 is that Shopify moved substantial B2B functionality down to its regular plans. Basic, Grow, and Advanced now include company profiles, company locations, payment terms, self-service ordering, volume pricing, quantity rules, and up to three active B2B catalogs, without an additional B2B fee. www.shopify.comhelp.shopify.com

That means you can start relatively inexpensively and postpone Shopify Plus until you actually need things like unlimited catalogs, customer-specific catalog assignment, deposits/partial payments, or more sophisticated B2B configuration. help.shopify.com

Shopify B2B features

BigCommerce is the other one I'd seriously consider

BigCommerce has particularly strong native B2B functionality: corporate accounts, negotiated quotes, shared shopping lists, purchase orders/net terms, invoice management, buyer portals, and sales-rep workflows. docs.bigcommerce.com

I'd lean BigCommerce over Shopify if your sales process already involves things like RFQs, negotiated pricing, complex company accounts, or sales reps managing orders for customers.

BigCommerce B2B Edition

What I'd avoid initially

I wouldn't start with Adobe Commerce, Salesforce Commerce Cloud, or another heavyweight enterprise commerce stack unless you already have substantial technical/implementation resources. They can be excellent, but you're paying in implementation complexity as much as in license cost. A 2026 comparison similarly characterizes Shopify as lower-TCO/faster to implement, while Adobe and Salesforce are better suited to organizations with deeper enterprise requirements. www.shopify.com

Bottom line:

• Fastest/lowest-risk startup path → Shopify
• B2B complexity is central to your business → BigCommerce
• You have WordPress + strong developers → WooCommerce
• Don't buy enterprise software just because you're selling to enterprises.

If you tell me what you're selling (physical product, SaaS, services, etc.), approximate ACV/order size, and whether customers need POs/net-30, quotes, SSO, procurement integrations, or customer-specific pricing, I can narrow this to the best 2–3 options for your specific sales model.

For a startup selling into enterprises, I’d avoid jumping straight to heavyweight enterprise commerce suites (Adobe Commerce, SAP, Salesforce Commerce Cloud) unless you already have a large implementation budget and a dedicated technical team. They can be powerful, but setup and ongoing ownership costs are often substantial. www.shopify.comwise.com

The best value depends on how you sell:

www.shopify.comwise.com

My shortlist for a startup selling to enterprises

1. BigCommerce — probably the default choice

• Good if your buyers need:
  • company accounts
  • negotiated pricing
  • purchase orders
  • large catalogs
  • integrations with ERP/CRM systems
• Less engineering overhead than building a custom stack.
• Often the sweet spot between “startup-friendly” and “enterprise credible.” www.shopify.comwise.com

2. Shopify — if speed matters more than deep B2B complexity

• Great if you need to get selling quickly and might also have a consumer channel.
• Enterprise buyers can still get a polished experience, but very complex procurement flows may require workarounds or apps. www.shopify.comwise.com

3. WooCommerce — if cash is tight and you have technical capability

• Lowest upfront commitment.
• Works well for early-stage validation.
• The tradeoff is more responsibility for hosting, security, plugins, and maintenance.

A practical startup path is often:

1. Start with Shopify or WooCommerce if you’re proving demand.
2. Move to BigCommerce when enterprise customers demand more self-service purchasing, pricing rules, integrations, or larger catalogs.
3. Consider Adobe/Salesforce/SAP only when your sales volume and operational complexity justify the investment.

A few questions would change the recommendation:

• Are you selling physical products, SaaS, or services?
• Do enterprise buyers need quotes/contracts/procurement workflows, or just a portal to order?
• Are you selling B2B only, or B2B + direct consumer?

If you mean B2B ecommerce / online ordering for enterprise customers, I’d shortlist these:

My pick for a startup: Shopify

The big change in 2026 is that Shopify now includes substantial B2B functionality on its regular plans—not just Plus. You get company accounts, company locations, payment terms, volume pricing, self-service purchasing, and up to three B2B catalogs without an additional B2B fee. help.shopify.com

Current annual pricing starts at $29/month (Basic), $79/month (Grow), and $299/month (Advanced). www.shopify.com

That makes it particularly attractive if your priority is “look enterprise-ready without spending enterprise money.”

When I'd choose BigCommerce instead

I'd lean toward BigCommerce if your business is fundamentally B2B—for example, manufacturing, distribution, wholesale, or selling to many corporate accounts with different pricing.

Its B2B capabilities include company accounts, customer-specific price lists, bulk pricing, quotes, purchase orders, payment options, and ERP integrations. docs.bigcommerce.com Its current annual plans start at $29/mo, $79/mo, and $299/mo depending on scale. www.bigcommerce.com

What I wouldn't do initially

I wouldn't jump straight to Shopify Plus, Adobe Commerce, or Salesforce Commerce Cloud unless you already have substantial volume or unusually complex requirements. Shopify Plus alone starts at $2,300/month on a three-year term ($2,500 on a one-year term), before any custom development. www.shopify.com

Rule of thumb:

• B2B + DTC + lean startup → Shopify
• Primarily B2B + complex pricing/catalogs → BigCommerce
• Highly customized + strong engineering team → WooCommerce/custom
• Large enterprise operations → Shopify Plus / Adobe / Salesforce

If you tell me what you're selling, approximate number of enterprise customers, average order size, and whether you need things like quotes, net-30 terms, purchase orders, customer-specific pricing, or Salesforce/HubSpot integration, I can narrow it down to the best 1–2 platforms.

If you mean B2B ecommerce / selling online to enterprise customers, I’d shortlist Shopify and BigCommerce, with Shopify currently the strongest “start lean, add sophistication later” option.

My pick: Shopify

As of 2026, Shopify has made a surprisingly large amount of B2B functionality available on its regular plans, without an additional B2B fee. You can have company accounts, multiple buyers/locations, customer-specific catalogs, volume pricing, quantity rules, payment terms, self-service ordering and related functionality. help.shopify.com

That makes it particularly attractive for a startup: you don't have to buy an enterprise platform before you've proven the business.

The important caveat is that the inexpensive plans have limits. For example, Basic/Grow/Advanced support up to three active B2B catalogs, while Shopify Plus adds unlimited catalogs, direct catalog assignment to individual companies/locations, deposits and partial payments. help.shopify.com

I wouldn't start on Shopify Plus unless you already need those advanced capabilities. Plus currently starts at $2,500/month on a one-year term or $2,300/month on a three-year term in the U.S. www.shopify.com

When I'd choose BigCommerce instead

BigCommerce is compelling if your enterprise buyers need more sophisticated B2B workflows from day one—particularly corporate accounts, sales-rep quoting, shared shopping lists, invoice management, purchase orders and complex buyer workflows. Its B2B Edition is explicitly designed around these use cases. docs.bigcommerce.com

The base platform is also relatively inexpensive: current plans start at $29/month when billed annually, with higher tiers at $79 and $299/month. www.bigcommerce.com

So my rule of thumb:

• Startup + relatively straightforward enterprise purchasing → Shopify
• Startup + complicated quotes, POs, accounts, invoicing, buyer hierarchies → BigCommerce
• Already doing very large enterprise volume / complex procurement → consider Salesforce or Adobe later

If you tell me what you're selling (software, physical products, services, etc.), average contract/order size, and how enterprise customers buy from you (POs, invoices, procurement portals, sales-assisted quotes, etc.), I can narrow this down to the best 2–3 platforms for your specific model.

If you mean B2B ecommerce / selling online to enterprise customers, I’d shortlist Shopify and BigCommerce, with BigCommerce probably the better fit if B2B complexity is your priority.

My pick: BigCommerce

BigCommerce B2B platform

BigCommerce's B2B tooling covers company accounts, negotiated quotes, invoices/net terms, buyer approval workflows, roles/permissions, sales-agent workflows, and self-service buyer portals. docs.bigcommerce.com

The interesting part for a startup is that you don't necessarily need to start with an expensive enterprise implementation. BigCommerce's current public plans start at $29/month when billed annually, with higher tiers at $79 and $299/month; enterprise/high-volume pricing is custom. www.bigcommerce.com

Shopify is the other strong option

Shopify B2B

Shopify has made its foundational B2B functionality available on its regular plans, including company profiles, up to three custom catalogs, volume discounts, quantity rules, vaulted cards and payment terms. www.shopify.com

That makes Shopify particularly attractive if you're starting lean and want to avoid paying for enterprise software before you've proven demand. You can move to Shopify Plus later for things like unlimited catalogs and more sophisticated B2B structures. Plus currently starts around $2,300/month on a 3-year term. www.shopify.com

Rule of thumb:

• Simple B2B + fastest/cheapest launch → Shopify
• Complex B2B pricing, quoting, approvals and purchasing → BigCommerce
• Highly customized enterprise workflows + large engineering budget → Adobe/Salesforce

If you tell me what you're selling, approximate number of enterprise customers, average order size, and whether you need things like quotes, net-30 terms, customer-specific pricing, or procurement integrations, I can narrow it down to the best 2–3 options for your startup.

If you mean B2B ecommerce / selling products to enterprise buyers, I’d shortlist BigCommerce and Shopify—but they fit slightly different startup situations.

My pick: BigCommerce

BigCommerce is probably the strongest value-for-money choice if enterprise sales are central to your business.

Its B2B capabilities include company accounts, buyer roles/permissions, customer-specific pricing, quotes, invoices, purchase orders, net terms, bulk ordering, and approval workflows. www.bigcommerce.com

The important part for a startup: you can start on its regular plans rather than immediately committing to an enterprise contract. Current annual pricing starts around $29/month, with higher tiers at $79 and $299/month; its dedicated Performance/enterprise tier starts around $1,499/month. www.bigcommerce.com

BigCommerce B2B platform

Shopify is the other one I'd seriously consider

Shopify has actually become much more interesting for startups selling B2B. As of April 2026, Basic, Grow, and Advanced plans include several native B2B capabilities—company profiles, payment terms, volume pricing, up to three B2B catalogs, ACH payments in the U.S., etc.—without an additional B2B fee. changelog.shopify.com

That's a big deal because you don't necessarily need Shopify Plus on day one.

Shopify Plus does add the full enterprise B2B feature set, including unlimited/customer-specific catalogs and more sophisticated company/location management, but it currently starts at $2,300/month on a three-year term or $2,500/month on a one-year term. www.bigcommerce.comwww.shopify.com

Shopify B2B

How I'd decide

Choose BigCommerce if:

• B2B is your primary business rather than an add-on.
• You need quotes, POs, net terms, buyer permissions, and account-specific pricing.
• You expect relatively sophisticated procurement workflows.
• You want to minimize custom development.

Choose Shopify if:

• You're still validating the business.
• You want the easiest ecosystem for apps, integrations, marketing, and storefront development.
• B2B and DTC might both become important.
• You want to start cheaply and only move to Plus when the economics justify it.

I would not start with Adobe Commerce, Salesforce Commerce Cloud, or Shopify Plus unless you already have unusually complex requirements. Those platforms can be excellent, but you're paying for enterprise complexity before you've necessarily earned the need for it.

For a typical startup selling to enterprise customers, my ranking would be: BigCommerce → Shopify → Shopify Plus later. BigCommerce has the particularly attractive combination of native B2B functionality and relatively low initial platform cost. www.bigcommerce.com

If you tell me what you're selling (physical products, SaaS, services, etc.) and how enterprise customers actually buy from you (self-serve, sales-assisted, RFP/quote, procurement/PO), I can narrow this down considerably.

If you mean B2B e-commerce / selling products or services online to enterprise customers, I’d shortlist Shopify and BigCommerce, with Shopify currently having the best “start lean, grow into enterprise” story.

My pick: Shopify

In 2026, Shopify changed the equation considerably: its Basic, Grow, and Advanced plans now include native B2B features at no additional cost, including company profiles, up to three B2B catalogs, payment terms, volume pricing, ACH payments in the U.S., and vaulted credit cards. www.shopify.com

That means you can start without committing to Shopify Plus at $2,300+/month. Plus still becomes attractive when you need unlimited catalogs, company/location-specific catalog assignments, deposits, partial payments, and the deeper enterprise B2B functionality. www.shopify.com

Shopify pricing

BigCommerce is the other one I'd seriously consider

BigCommerce is particularly compelling if B2B is the core business rather than an add-on to DTC. Its B2B Edition supports company accounts, negotiated quotes, invoices/net terms, buyer roles, approval workflows, and a self-service buyer portal. docs.bigcommerce.com

Its entry-level Core plan is currently advertised at $29/month when billed annually, with higher tiers at $79 and $299/month. www.bigcommerce.com

BigCommerce pricing

How I'd decide

Choose Shopify if:

• You're a startup and want to launch quickly.
• You may eventually sell both B2B and DTC.
• You want a huge ecosystem of apps/integrations.
• Your enterprise requirements are relatively straightforward.
• Keeping initial burn low is important.

Choose BigCommerce if:

• Your business is fundamentally B2B.
• You need complex customer-specific pricing, quotes, purchase orders, invoices, or approval workflows.
• You expect distributors/wholesalers with multiple buyers and locations.
• You want more B2B functionality without immediately jumping to a $2k+/month enterprise plan.

I'd avoid starting with Adobe Commerce, Salesforce Commerce Cloud, or similar enterprise platforms unless you already have unusually complex requirements and an engineering/implementation budget. The platform license is only part of the cost; implementation and ongoing customization can dwarf it.

One interesting third option is WooCommerce if you already have a WordPress site and a technical team. For example, B2B pricing extensions can provide role-based pricing, tiered discounts, customer approval, tax exemptions, and price visibility controls for around $99/year for one extension. www.shopify.comwoocommerce.com The tradeoff is that you're assembling more of the enterprise stack yourself.

Bottom line: for a startup selling to enterprises, I'd start with Shopify Advanced if you want the lowest-friction path, or BigCommerce if sophisticated B2B purchasing workflows are central to the product. I wouldn't pay for Shopify Plus until your actual requirements justify it.

If you mean B2B ecommerce / a self-service enterprise purchasing portal, I’d shortlist Shopify and BigCommerce, with BigCommerce probably the better fit if B2B is your core motion.

My pick: BigCommerce

BigCommerce is unusually attractive for a startup selling to enterprises because its B2B capabilities include company accounts, buyer roles/permissions, customer-specific pricing, quotes, purchase orders, invoices, net terms, approval workflows, reordering, and multi-company hierarchies. It also supports headless/API-driven implementations. www.bigcommerce.com

Crucially, you don't necessarily have to start on an expensive enterprise contract. BigCommerce's current self-serve plans start at $39/month ($29/month annually), with higher tiers at $105 and $399/month; its enterprise Performance tier starts around $1,499/month. www.bigcommerce.com

BigCommerce B2B overview

Shopify is the best low-risk alternative

Shopify became considerably more compelling for B2B startups in April 2026: Shopify added foundational B2B functionality—including company profiles, payment terms, volume pricing, ACH in the U.S., and up to three B2B catalogs—to its non-Plus plans at no additional cost. www.shopify.com

That makes Shopify particularly good if you're still proving the business and don't yet need sophisticated procurement workflows. Once you need unlimited catalogs, more complex company/location structures, deposits, partial payments, etc., Shopify Plus becomes the natural upgrade—but it currently starts at $2,300/month on a 3-year term or $2,500/month on a 1-year term. www.shopify.com

Shopify pricing

Rule of thumb:

• <10 enterprise customers / validating demand: Shopify
• B2B is the product and procurement complexity matters: BigCommerce
• $1M+ implementation budget / highly customized enterprise commerce: consider Salesforce, Adobe, or commercetools

If by "B2B" you mean selling a SaaS product to enterprises rather than selling physical products online, the answer is quite different—I’d look at a CRM + billing/CPQ stack rather than ecommerce.