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APIs · head to head

Thunder Client vs Tuum

Thunder Client logo

Thunder Client

APIs

Lightweight REST API client built as VSCode extension

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 Thunder Client has a free tier, so it costs nothing to try first.
  • Each has a real cost: Thunder Client paid plans are billed annually only: Starter is $3 per user per month and capped at a maximum of 10 seats, Business is $7 per user per month with 500 monthly collection runs per user, and Enterprise is $16 per user per month for unlimited runs; 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: Thunder Client covers REST Client, Tuum covers Modular product structure.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Thunder Client and Tuum actually diverge.

Attributes where Thunder Client and Tuum differ
AttributeThunder ClientTuum
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo
PlatformsVSCode extension, WebWeb, API
Founded2021Unknown

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 Thunder Client

  • REST Client
  • Environment variables
  • Response testing
  • VSCode
  • GitHub
  • Webhook support
  • VSCode extension support
  • Web support

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.

Thunder Client

  • API Developmentnot Tuum
  • API Gatewaynot Tuum
  • API Testingnot Tuum
  • API Documentationnot Tuum
  • Microservicesnot Tuum

Tuum

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

Where each one falls short

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

Thunder Client

  • Paid plans are billed annually only: Starter is $3 per user per month and capped at a maximum of 10 seats, Business is $7 per user per month with 500 monthly collection runs per user, and Enterprise is $16 per user per month for unlimited runs

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

Thunder Client

Free
  • FreeFree
    • REST client
    • Collection management
    • Local testing
  • Pro$8/monthly
    • Cloud sync
    • Team collaboration
    • Advanced features

Tuum

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

Which should you pick?

Choose Thunder Client if

  • You need rest client.
  • You want to start without paying.
  • You work on VSCode extension, Web.
  • You also want environment variables.
Thunder Client 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 Thunder Client or Tuum better?
Neither clearly leads. Thunder Client 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, Thunder Client or Tuum?
Thunder Client has a free tier; the other does not. Paid plans start at Free for Thunder Client and On request for Tuum.
Does Thunder Client or Tuum run on more platforms?
Thunder Client runs on VSCode extension, Web. Tuum runs on Web, API.
Can I use Thunder Client for free?
Yes. Thunder Client has a free tier, so you can try it without paying. Tuum starts at On request.
What is Thunder Client best used for?
Thunder Client is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what Tuum is typically brought in for.
What can Thunder Client do that Tuum cannot?
Thunder Client covers REST Client, Environment variables, Response testing, VSCode. Tuum covers Modular product structure, Low-code integration middleware, Cloud-agnostic deployment, Multi-currency real-time accounts.

Answered from the vendors’ own pages

Thunder Client: How much does Thunder Client cost?

Thunder Client publishes a free plan at no cost, then Starter at $3, Business at $7 and Enterprise at $16, all priced annually.

Source
Tuum: Is Tuum the same company as Modularbank?

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

Thunder Client: Is Thunder Client free?

Yes, there is a free plan. It is used through the Thunder Client extension for VS Code, available from the marketplace, with limits applied compared with the paid tiers.

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.

Tuum: Is pricing published?

No, subscription and module pricing require a sales conversation.

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