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APIs · head to head

Rutter vs Tuum

Rutter logo

Rutter

APIs

One API across accounting, commerce, payments and advertising platforms

From
On request
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

  • Each has a real cost: Rutter a unified schema exposes only the fields common across platforms, so the platform-specific detail underwriting models want usually requires passthrough calls and per-platform code, which is the work the unified API was bought to avoid.; 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: Rutter covers Accounting and ERP, Tuum covers Modular product structure.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Rutter and Tuum actually diverge.

Attributes where Rutter and Tuum differ
AttributeRutterTuum

Identical on both: starting price (On request), pricing model (quote), free tier (No), 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 Rutter

  • Accounting and ERP
  • Commerce data
  • Payments data
  • Advertising data
  • Write operations
  • Passthrough requests
  • Observability tooling
  • Sandbox

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.

Rutter

  • A revenue-based lender that must pull a merchant's sales, payouts and general ledger before pricing a facilitynot Tuum
  • A spend management product that needs to push bills and journal entries back into whichever accounting system its customer runsnot Tuum
  • A B2B payments platform reconciling invoices across customers using four different ERPsnot Tuum
  • An insurance or benefits provider that needs verified business financials without asking the customer to upload PDFsnot Tuum

Tuum

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

Where each one falls short

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

Rutter

  • A unified schema exposes only the fields common across platforms, so the platform-specific detail underwriting models want usually requires passthrough calls and per-platform code, which is the work the unified API was bought to avoid.
  • Write operations into accounting systems are where these products break, because each system validates differently, and a rejected journal entry surfaces as a support ticket against you rather than against the ERP.
  • No pricing is published beyond a sandbox trial, so cost cannot be compared against alternatives without a sales process, and pricing tends to scale with connected accounts.
  • QuickBooks Desktop and other on-premises systems require a local connector or hosted agent, which introduces installation steps your customers must complete and support burden you inherit.
  • Sync freshness varies by platform and by customer authorisation state, so a product promising near real-time figures will find some connections update far less often than the marketing implies.

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

Rutter

On request
  • Starter$undefined/month
    • Thirty day sandbox trial
    • Test integrations with QuickBooks, Xero, FreshBooks and Zoho Books
    • Documentation and workflow guides
  • Full Access$undefined/year
    • Production access across all platforms
    • Includes NetSuite, QuickBooks Desktop and Sage Intacct
    • Write operations and passthrough

Tuum

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

Which should you pick?

Choose Rutter if

  • You need accounting and erp.
  • You work on Web, API.
  • You also want commerce data.
Rutter 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 Rutter or Tuum better?
Neither clearly leads. Rutter starts at On request and Tuum at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Rutter or Tuum?
Rutter starts at On request and Tuum at On request.
Does Rutter or Tuum run on more platforms?
Both run on Web, API, so platform support will not decide this one for you.
What is Rutter best used for?
Rutter is most often used for a revenue-based lender that must pull a merchant's sales, payouts and general ledger before pricing a facility, a spend management product that needs to push bills and journal entries back into whichever accounting system its customer runs, a b2b payments platform reconciling invoices across customers using four different erps, an insurance or benefits provider that needs verified business financials without asking the customer to upload pdfs. Of those, a revenue-based lender that must pull a merchant's sales, payouts and general ledger before pricing a facility and a spend management product that needs to push bills and journal entries back into whichever accounting system its customer runs are not what Tuum is typically brought in for.
What can Rutter do that Tuum cannot?
Rutter covers Accounting and ERP, Commerce data, Payments data, Advertising data. Tuum covers Modular product structure, Low-code integration middleware, Cloud-agnostic deployment, Multi-currency real-time accounts.

Answered from the vendors’ own pages

Rutter: Does Rutter support QuickBooks Desktop?

Yes, which distinguishes it from unified APIs that only cover cloud accounting, and matters because many small businesses still run it.

Tuum: Is Tuum the same company as Modularbank?

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

Rutter: Can Rutter write data back?

Yes. Invoices, bills and journal entries can be pushed into supported accounting systems, not only read.

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.

Rutter: Is there a free tier?

There is a thirty day sandbox trial with test data. Production access requires a paid plan with quoted pricing.

Tuum: Is pricing published?

No, subscription and module pricing require a sales conversation.

Rutter: What if the unified model lacks a field I need?

Rutter supports passthrough requests to the underlying platform API, though using them reintroduces platform-specific code.

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