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APIs · head to head

KeystoneJS vs Mambu

KeystoneJS logo

KeystoneJS

APIs

Powerful Node.js headless CMS framework and API platform

From
Free
Rated
-
Full reviewWebsite
Mambu logo

Mambu

APIs

Composable cloud core banking platform used by banks, lenders and fintechs in 65-plus countries

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only KeystoneJS has a free tier, so it costs nothing to try first.
  • Each has a real cost: KeystoneJS database support is limited to PostgreSQL, MySQL and SQLite; Mambu pricing is entirely unpublished, and as subscription and usage-based fees scale with a bank's book of business, total cost at scale is hard to forecast before a detailed vendor conversation.
  • They diverge on capability: KeystoneJS covers REST API, Mambu covers Composable engine architecture.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which KeystoneJS and Mambu actually diverge.

Attributes where KeystoneJS and Mambu differ
AttributeKeystoneJSMambu
Starting priceFreeOn request
Pricing modelopen-sourcequote
Free tierYesNo
PlatformsNode.js, Self-hostedWeb, API
Founded2016Unknown

Identical on both: 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 KeystoneJS

  • REST API
  • GraphQL API
  • Admin interface
  • Node.js
  • Next.js
  • React
  • Databases
  • Node.js support

Only in Mambu

  • Composable engine architecture
  • Deposits and lending core
  • Cloud-native SaaS delivery
  • Marketplace of connectors
  • Multi-country regulatory support
  • API-first orchestration

What people use each for

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

KeystoneJS

  • Headless CMS implementationnot Mambu
  • Content management systemsnot Mambu
  • Customizable API-driven applicationsnot Mambu

Mambu

  • A digital-first challenger bank wanting a cloud-native core without building banking infrastructure from scratchnot KeystoneJS
  • A lender needing configurable loan product engines to launch new credit products fasternot KeystoneJS
  • An established bank doing incremental core modernisation rather than a full monolithic core replacementnot KeystoneJS
  • A fintech in an emerging or regulated market needing pre-built compliance configuration across many jurisdictionsnot KeystoneJS

Where each one falls short

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

KeystoneJS

  • Database support is limited to PostgreSQL, MySQL and SQLite
  • Keystone 5 is a separate legacy product documented on a different site and is not covered by the Keystone 6 docs
  • Upgrading requires following a dedicated Migrate to 8.0.0 guide, so major versions are not drop-in
  • Free support is a community Slack; enterprise-grade consulting and support is a separate paid engagement with Thinkmill and no published price

Mambu

  • Pricing is entirely unpublished, and as subscription and usage-based fees scale with a bank's book of business, total cost at scale is hard to forecast before a detailed vendor conversation.
  • A core banking implementation is a multi-year, high-switching-cost commitment regardless of vendor, and Mambu is no exception; a wrong initial configuration choice is expensive to unwind.
  • Composability is a genuine strength but also means more integration and configuration decisions fall to the bank's own team or system integrator, versus a more opinionated, less flexible fixed-core alternative.
  • As cloud-hosted core banking infrastructure, a bank is trusting Mambu's own uptime and security posture for its most business-critical system, concentrating operational risk in one vendor relationship.
  • Newer entrants such as Thought Machine and 10x Banking compete directly on similar composable positioning, so Mambu's tenure advantage is real but narrowing as competitors mature.

Pricing, plan by plan

KeystoneJS

Free
  • Open SourceFree
    • Full KeystoneJS
    • Community support

Mambu

On request
  • Mambu$undefined/year
    • Subscription pricing, structured by modules and usage
    • Exact rates not published, custom quote required

Which should you pick?

Choose KeystoneJS if

  • You need rest api.
  • You want to start without paying.
  • You work on Node.js, Self-hosted.
  • You also want graphql api.
KeystoneJS review

Choose Mambu if

  • You need composable engine architecture.
  • You work on Web, API.
  • You also want deposits and lending core.
Mambu review

Questions people ask

Is KeystoneJS or Mambu better?
Neither clearly leads. KeystoneJS starts at Free and Mambu at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, KeystoneJS or Mambu?
KeystoneJS has a free tier; the other does not. Paid plans start at Free for KeystoneJS and On request for Mambu.
Does KeystoneJS or Mambu run on more platforms?
KeystoneJS runs on Node.js, Self-hosted. Mambu runs on Web, API.
Can I use KeystoneJS for free?
Yes. KeystoneJS has a free tier, so you can try it without paying. Mambu starts at On request.
What is KeystoneJS best used for?
KeystoneJS is most often used for headless cms implementation, content management systems, customizable api-driven applications. Of those, headless cms implementation and content management systems are not what Mambu is typically brought in for.
What can KeystoneJS do that Mambu cannot?
KeystoneJS covers REST API, GraphQL API, Admin interface, Node.js. Mambu covers Composable engine architecture, Deposits and lending core, Cloud-native SaaS delivery, Marketplace of connectors.

Answered from the vendors’ own pages

KeystoneJS: Is KeystoneJS free?

Yes, KeystoneJS is free and open source with no licensing fees. Core platform has no lock-in and is contributed to by 250+ developers.

Source
Mambu: Is Mambu on-premise or cloud?

Cloud-native SaaS delivery, not an on-premise installation.

KeystoneJS: What are hosting costs for KeystoneJS?

KeystoneJS is self-hosted and deployment-agnostic. Hosting costs depend on your chosen deployment platform (Vercel, AWS, Heroku, etc.) and infrastructure, not KeystoneJS itself.

Source
Mambu: Does it publish pricing?

No, pricing is subscription-based, structured by modules and usage, but not published publicly.

KeystoneJS: Does KeystoneJS offer paid support?

Enterprise support with tailored options is available from Thinkmill, the company behind KeystoneJS. Pricing details available upon request.

Source
Mambu: How many countries does it operate in?

It is used by banks, lenders and fintechs across more than 65 countries.

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