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APIs · head to head

Stainless vs Tuum

Stainless logo

Stainless

APIs

Generates client SDKs, API docs, and MCP servers from an OpenAPI spec

From
Free
Rated
-
Full reviewWebsite
Tuum logo

Tuum

APIs

Modular core banking platform from Estonia, formerly branded Modularbank

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Stainless has a free tier, so it costs nothing to try first.
  • Each has a real cost: Stainless starter and Pro plan prices are not published and require contacting the company.; Tuum it is a smaller, younger company than Mambu, so it has fewer live reference deployments and a shorter track record to evaluate risk against.
  • They diverge on capability: Stainless covers SDK generation, Tuum covers Modular product structure.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Stainless and Tuum actually diverge.

Attributes where Stainless and Tuum differ
AttributeStainlessTuum
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo

Identical on both: platforms (web, api), user rating (Not yet rated), category (APIs).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Stainless

  • SDK generation
  • MCP server generation
  • Docs site generation
  • Webhooks and streaming support
  • Automated unit tests
  • Git integration

Only in Tuum

  • Modular product structure
  • Low-code integration middleware
  • Cloud-agnostic deployment
  • Multi-currency real-time accounts
  • Cards and lending modules
  • Faster migration timeline

What people use each for

The jobs each tool is most often brought in to do.

Stainless

  • Generating typed SDKs for a public APInot Tuum
  • Producing an MCP server from an existing OpenAPI specnot Tuum
  • Building an API documentation site alongside client librariesnot Tuum
  • Giving open-source APIs a free SDK generation pathnot Tuum

Tuum

  • A bank wanting to migrate specific banking products to the cloud within months rather than replacing its entire core at oncenot Stainless
  • A fintech in the DACH region or Middle East wanting a European core banking vendor with regional expansion focusnot Stainless
  • An institution wanting low-code middleware to connect new modules to an existing legacy core rather than a full rebuildnot Stainless
  • A company researching "Modularbank" that needs to confirm it is the same company now branded Tuumnot Stainless

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Stainless

  • Starter and Pro plan prices are not published and require contacting the company.
  • The free plan caps APIs at 25 endpoints, which excludes larger production APIs.
  • Overage charges apply per SDK/endpoint/month once limits are exceeded, which can make costs unpredictable at scale.

Tuum

  • It is a smaller, younger company than Mambu, so it has fewer live reference deployments and a shorter track record to evaluate risk against.
  • The 2022-era rebrand from Modularbank to Tuum means older funding records, case studies and press coverage appear under a different name, complicating due diligence for anyone unaware of the change.
  • Pricing is entirely unpublished, requiring a sales conversation to budget against competing composable core vendors.
  • Its geographic expansion into DACH and the Middle East is comparatively recent, so support depth and local regulatory expertise in those markets are less proven than in its home Baltic and Nordic base.
  • As with any core banking platform, choosing Tuum is a multi-year infrastructure commitment; switching cores after implementation is a major undertaking regardless of how modular the initial adoption was.

Pricing, plan by plan

Stainless

Free
  • FreeFree
    • Up to 5 generators (SDKs, docs, or MCP servers)
    • 5 seats
    • APIs with 25 or fewer endpoints
  • Starter$undefined/mo
    • Unlimited generators
    • Expanded seats
    • Private SDKs of any size
  • Pro$undefined/mo
    • Custom enterprise features and pricing
  • Enterprise$undefined/mo
    • Dedicated support
    • SOC 2 compliance reports
    • Purchase order/invoicing with negotiable terms

Tuum

On request
  • Tuum$undefined/year
    • Subscription and module-based pricing, not published
    • Custom quote required via sales

Which should you pick?

Choose Stainless if

  • You need sdk generation.
  • You want to start without paying.
  • You work on web, api.
  • You also want mcp server generation.
Stainless review

Choose Tuum if

  • You need modular product structure.
  • You work on Web, API.
  • You also want low-code integration middleware.
Tuum review

Questions people ask

Is Stainless or Tuum better?
Neither clearly leads. Stainless starts at Free and Tuum at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Stainless or Tuum?
Stainless has a free tier; the other does not. Paid plans start at Free for Stainless and On request for Tuum.
Does Stainless or Tuum run on more platforms?
Stainless runs on web, api. Tuum runs on Web, API.
Can I use Stainless for free?
Yes. Stainless has a free tier, so you can try it without paying. Tuum starts at On request.
What is Stainless best used for?
Stainless is most often used for generating typed sdks for a public api, producing an mcp server from an existing openapi spec, building an api documentation site alongside client libraries, giving open-source apis a free sdk generation path. Of those, generating typed sdks for a public api and producing an mcp server from an existing openapi spec are not what Tuum is typically brought in for.
What can Stainless do that Tuum cannot?
Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support. Tuum covers Modular product structure, Low-code integration middleware, Cloud-agnostic deployment, Multi-currency real-time accounts.

Answered from the vendors’ own pages

Stainless: Is there a free plan, and what are its limits?

Yes. The Free plan supports up to 5 generators, 5 seats, APIs with 25 or fewer endpoints, and 100 preview builds per month, with email support.

Source
Tuum: Is Tuum the same company as Modularbank?

Yes, Modularbank rebranded to Tuum; it is the same company and platform.

Stainless: Who owns the generated SDK code?

The generated SDK code is owned by the customer and published by Stainless under the Apache 2.0 license.

Source
Tuum: Where is it strongest geographically?

Its base is Estonia and the Nordic and Baltic region, with newer expansion into DACH and the Middle East.

Stainless: What happens if I exceed my plan's endpoint limit?

Customers exceeding their endpoint limits are billed per SDK, per endpoint, per month for the overage.

Source
Tuum: Is pricing published?

No, subscription and module pricing require a sales conversation.

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