Shopify Plus vs BigCommerce: Fees, Checkout and B2B

Shopify Plus vs BigCommerce is really a question about where the fee, the checkout and the migration cost sit, because both platforms sell to the same buyer — a brand past the point where a standard plan’s limits are the problem. This comparison is for a $3M–$30M operator deciding between the two enterprise tiers, not for a startup evaluating either platform’s entry-level plan.

What is Shopify Plus, and who is it actually for?

Shopify Plus is Shopify’s enterprise tier: the same core commerce engine as Shopify’s standard plans, with a published platform fee, higher API limits, multi-store administration under one account, and checkout built on Shopify’s Checkout Extensibility framework rather than an open template. It fits a brand already running on Shopify that has outgrown a standard plan’s API and app-limit ceilings, or that needs B2B, multi-store or checkout-customization functionality a lower Shopify plan does not include.

Shopify Plus’s published base platform fee is $2,500 USD a month on a 1-year term, or $2,300 a month on a 3-year term (Shopify’s pricing page, checked 13 September 2026). Shopify also names a variable, revenue-scaled platform fee option for larger or more complex merchants without publishing its formula on the same page — the only way to know which pricing applies to a given account, or which one is cheaper for your GMV, is to get both quoted in writing from a Shopify Plus account executive. Full detail on what that base fee omits is in the Shopify Plus cost guide.

Shopify Plus is not the right pick for a brand that wants low-level access to rewrite the checkout flow from scratch, or that runs most of its stack on a small number of apps with no Shopify listing at all.

What is BigCommerce Enterprise, and who is it actually for?

BigCommerce Enterprise is BigCommerce’s top tier, sold entirely by quote rather than a published rate card. BigCommerce’s structural pitch has been a more open architecture from the start — no platform-level transaction fee regardless of payment gateway, a checkout that is more directly customizable at the template and API level, and headless commerce support that predates Shopify’s own push into the same space by several years. It fits a brand that wants that lower-level access, that already has an in-house or agency development team comfortable working closer to the platform’s code, or that is priced out of Shopify Plus’s fee structure at its own revenue and wants a negotiated quote instead.

BigCommerce Enterprise pricing is — metric to confirm. There is no published figure to quote here, because BigCommerce sells the tier entirely by negotiated quote against a merchant’s revenue, order volume and feature needs; get a written number from BigCommerce sales rather than trusting a third-party estimate, including this one.

BigCommerce Enterprise is not the right pick for a brand that wants the largest possible app ecosystem behind every workflow, or one whose team has no appetite for the more hands-on, developer-facing side of a more open platform.

Shopify Plus vs BigCommerce: the comparison table

This table sets out the shape of the decision, not the whole of it — the migration-effort sections that follow are where the real cost usually hides.

Treat this comparison as a starting filter, not a scorecard: a brand with five load-bearing apps that only integrate with Shopify has its answer regardless of any other dimension listed here. A brand with no such dependency and a strong in-house dev team is the one for whom the rest of the comparison actually decides the question.

What does it cost to migrate from BigCommerce to Shopify Plus?

The records move with moderate, well-documented effort: products, customer accounts and order history migrate through Shopify’s own import tooling or a dedicated migration app, and this is the part both platforms’ migration marketing shows in the demo. What does not move automatically is anything built into BigCommerce’s Stencil theme logic, checkout customizations, or app-specific automation rules — those have no direct Shopify equivalent to import into, because Shopify’s theme and checkout architecture is not the same shape as BigCommerce’s. That gap gets rebuilt against Shopify’s own tools rather than transferred, and the rebuild — not the record migration — is what usually decides whether the project takes three weeks or three months.

The proprietary judgement worth stating plainly: a migration quote or timeline that only accounts for product and customer data import is quoting the easy third of the job. Ask any migration vendor, in-house or agency, to name specifically which checkout customizations, theme features and app workflows will be rebuilt from scratch versus transferred, before treating any migration timeline as reliable.

What does it cost to migrate from Shopify Plus to BigCommerce?

Migrating from Shopify Plus to BigCommerce carries the same asymmetry in reverse. Product, customer and order records move with comparable effort. Anything built on Shopify Plus’s Checkout Extensibility — Functions, custom validation rules, checkout UI extensions — has no direct import path into BigCommerce’s checkout, because Checkout Extensibility and BigCommerce’s own checkout customization model are structurally different systems, not two dialects of the same one. That work gets rebuilt against BigCommerce’s tools from a specification, not ported by a migration tool.

A store still running legacy checkout.liquid customization rather than Checkout Extensibility faces a smaller version of this same problem even without changing platforms — Shopify has moved Plus merchants off checkout.liquid, and that migration alone requires the same kind of scoped rebuild a full platform switch does, just contained to one part of the stack.

Which one is right for a $3M–$30M brand?

Neither platform is a wrong choice at this revenue band on functionality alone — both now ship native B2B, both support headless, both handle multi-store. The decision comes down to three questions that only your own operation can answer: which platform your five or six load-bearing apps actually integrate with, whether your team wants sanctioned checkout extension points or lower-level template access, and whether a published, predictable platform fee or a negotiated, revenue-scaled quote is the better fit for your finance team’s planning process. A brand deep in the Shopify app ecosystem with a checkout customization need that Checkout Extensibility already covers has a straightforward answer. A brand that wants more direct control over checkout templates and is comfortable negotiating an enterprise contract has an equally straightforward one in the other direction.

For a brand heading toward the $30M mark specifically, the operational question worth asking before either platform decision is what proportion of the catalogue, order and fulfilment workflow is still manual — the scaling-brands guide covers what typically breaks first at that stage, independent of which platform sits underneath it.

Where does headless fit into this decision?

Both platforms support building a fully decoupled front end against their commerce APIs, and neither platform’s headless option is the deciding factor between them on its own — a headless build’s real cost sits in the front-end engineering team and the ongoing integration maintenance, not in which vendor’s GraphQL schema you’re calling. The headless commerce guide covers when a headless build is worth that cost and when a platform’s own rendered storefront covers the same ground for less. A brand evaluating Shopify Plus vs BigCommerce specifically for headless reasons should scope the front-end build first — the platform choice underneath it matters less than the guide’s framing suggests it might.

Where does B2B fit into this decision?

Both platforms now treat B2B as a native tier feature rather than a bolt-on app, which narrows what used to be a clearer differentiator. The part worth checking before either purchase is whether the platform’s company-account and approval-workflow object model actually matches how your sales team quotes and approves orders today — a checkbox comparison of “has B2B” tells you nothing about whether that B2B ships the specific quoting logic your team runs. The Shopify B2B guide covers what Shopify’s own B2B object model does and does not cover; BigCommerce’s equivalent needs the same scrutiny against its own current documentation before a purchase decision, not a marketing page.

Who should not choose either platform right now?

A brand under the published $3M floor is better served by a standard Shopify plan or BigCommerce’s own lower tier — the platform fee on either enterprise tier is commonly a larger share of net margin than the checkout-extensibility, multi-store or B2B functionality is worth against a catalogue and order volume that size. And a brand evaluating either platform specifically to sell through an AI shopping agent’s built-in checkout should know that ground shifted recently: OpenAI launched Instant Checkout inside ChatGPT in September 2025 and withdrew it on 4 March 2026. Neither Shopify Plus nor BigCommerce Enterprise is currently a platform decision that turns on agentic checkout support, because the shipped version of that capability was pulled. The safer frame for both platforms right now is discover in AI, buy on site — not agentic checkout readiness as a purchase criterion.

Whichever platform you land on, a Shopify Plus vs BigCommerce decision only settles which software runs the store. What actually breaks at $3M–$30M is almost never the platform itself — it’s the manual handoffs between the platform, the app stack and fulfilment that nobody automated because the team was busy shipping the migration. That’s an ops automation problem regardless of which checkout you’re running, and it’s ops automation work, not a platform swap, that closes that gap.