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APIs · head to head

Griffin vs Tuum

Griffin logo

Griffin

APIs

UK banking-as-a-service from a company that holds its own full banking licence

From
£100/month
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: Griffin platform banking carries a one-off onboarding fee from 15,000 pounds and a 3,500 pound monthly minimum, which prices out early-stage companies entirely.; 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: Griffin covers Bank accounts by API, Tuum covers Modular product structure.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Griffin and Tuum actually diverge.

Attributes where Griffin and Tuum differ
AttributeGriffinTuum
Starting price£100/monthOn request
Pricing modelPer month with usage drawdownquote
PlatformsWeb, REST APIWeb, API

Identical on both: free tier (No), 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 Griffin

  • Bank accounts by API
  • UK payment rails
  • Integrated ledger
  • Automated onboarding
  • Debit cards
  • Interest on balances

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.

Griffin

  • A wealth platform that must hold client money in a licensed bank rather than an EMI safeguarding accountnot Tuum
  • A lender wanting UK accounts and payment rails without becoming a bank itselfnot Tuum
  • A fintech burned by sponsor bank instability that wants the deposit holder and the API provider to be the same entitynot Tuum
  • A platform needing sub-account ledgering for pooled client funds with a clean audit trailnot Tuum

Tuum

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

Where each one falls short

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

Griffin

  • Platform banking carries a one-off onboarding fee from 15,000 pounds and a 3,500 pound monthly minimum, which prices out early-stage companies entirely.
  • It is UK-only, so a business with European or US operations needs a second banking provider and a second integration for those entities.
  • It is a young bank with a small balance sheet relative to incumbents, and enterprise counterparties still ask hard questions about concentration risk.
  • Holding a banking licence means Griffin applies bank-grade due diligence to its own clients, so onboarding is slower and more selective than an EMI-based provider.
  • Feature breadth is narrower than long-established providers, particularly in card programme management and in payment types beyond core UK rails.

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

Griffin

£100/month
  • Business Banking$100/month
    • From 100 pounds per month
    • Interest or commission from around 1.75 percent AER variable
    • Operational accounts and UK payment rails
  • Platform Banking$3500/month
    • One-off onboarding fee from 15,000 pounds
    • Minimum monthly spend of 3,500 pounds, drawn down by usage
    • Higher committed tiers at 5,000 and 10,000 pounds with discounts
  • Enterprise$undefined/month
    • Custom pricing
    • Bespoke account structures and volumes
    • Negotiated interest or commission share

Tuum

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

Which should you pick?

Choose Griffin if

  • You need bank accounts by api.
  • You work on Web, REST API.
  • You also want uk payment rails.
Griffin 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 Griffin or Tuum better?
Neither clearly leads. Griffin starts at £100/month and Tuum at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Griffin or Tuum?
Griffin starts at £100/month and Tuum at On request.
Does Griffin or Tuum run on more platforms?
Griffin runs on Web, REST API. Tuum runs on Web, API.
What is Griffin best used for?
Griffin is most often used for a wealth platform that must hold client money in a licensed bank rather than an emi safeguarding account, a lender wanting uk accounts and payment rails without becoming a bank itself, a fintech burned by sponsor bank instability that wants the deposit holder and the api provider to be the same entity, a platform needing sub-account ledgering for pooled client funds with a clean audit trail. Of those, a wealth platform that must hold client money in a licensed bank rather than an emi safeguarding account and a lender wanting uk accounts and payment rails without becoming a bank itself are not what Tuum is typically brought in for.
What can Griffin do that Tuum cannot?
Griffin covers Bank accounts by API, UK payment rails, Integrated ledger, Automated onboarding. Tuum covers Modular product structure, Low-code integration middleware, Cloud-agnostic deployment, Multi-currency real-time accounts.

Answered from the vendors’ own pages

Griffin: Is Griffin actually a bank?

Yes. It received a UK banking licence with restrictions in March 2023 and a full licence in March 2024 after exiting mobilisation.

Tuum: Is Tuum the same company as Modularbank?

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

Griffin: What does it cost?

Business banking from 100 pounds a month; platform banking from a 15,000 pound onboarding fee plus a 3,500 pound monthly minimum drawn down by usage.

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.

Griffin: Does it cover Europe?

No. Griffin is a UK bank serving UK accounts and UK payment rails.

Tuum: Is pricing published?

No, subscription and module pricing require a sales conversation.

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