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Finxact vs Keil MDK

Finxact logo

Finxact

Technology

Cloud native core banking, sold as Finxact from Fiserv since the 2022 acquisition

From
On request
Free plan
No
Full reviewWebsite
Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Keil MDK has a free tier, so it costs nothing to try first.
  • Each has a real cost: Finxact fiserv sells several core platforms, so a buyer should demand written investment and support commitments for Finxact specifically rather than trusting that the surviving brand implies a protected roadmap.; Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Finxact and Keil MDK actually diverge.

Attributes where Finxact and Keil MDK differ
AttributeFinxactKeil MDK
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWeb, API, CloudWeb
CategoryTechnologyDeveloper Tools

Identical on both: user rating (Not yet rated).

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 Finxact

  • Cloud native core
  • Real time posting
  • Configurable product definitions
  • Fiserv ecosystem access
  • Embedded banking support
  • Open API model
  • Multi tenant deployment
  • Regulatory reporting hooks

Only in Keil MDK

Nothing recorded that Finxact does not also cover.

What people use each for

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

Finxact

  • A United States regional bank replacing a legacy core but unwilling to take supplier viability risk on an independent challengernot Keil MDK
  • A community bank launching an embedded banking or sponsor bank programme on modern railsnot Keil MDK
  • An institution already running Fiserv card and payment services that wants the core on the same vendor relationshipnot Keil MDK
  • A bank standing up a new digital brand on a clean core while leaving the existing back book in placenot Keil MDK

Keil MDK

  • Embedded software developmentnot Finxact
  • ARM microcontroller programmingnot Finxact
  • Professional development environmentsnot Finxact

Where each one falls short

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

Finxact

  • Fiserv sells several core platforms, so a buyer should demand written investment and support commitments for Finxact specifically rather than trusting that the surviving brand implies a protected roadmap.
  • Core migration is a multi year programme where the licence is a small share of total cost against integration, data migration and parallel running.
  • Buying the core from Fiserv strengthens a relationship that already covers cards and payments, which weakens your negotiating position across the whole estate at renewal.
  • It is a United States product with United States regulatory and product assumptions, so international banks get little from it.
  • Being part of a very large vendor changes the service experience: the responsiveness that made Finxact attractive as a startup is not guaranteed inside a company of Fiserv's scale.

Keil MDK

  • Pricing for Essential and Professional subscriptions not disclosed on primary site
  • Customers must contact Arm Developer Tools store for subscription rates

Pricing, plan by plan

Finxact

On request
  • Finxact from Fiserv$undefined/year
    • Quoted per institution, commonly on accounts or asset size
    • Implementation and integration costs typically exceed the licence fee
    • Bundled commercially with other Fiserv services in many deals

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Which should you pick?

Choose Finxact if

  • You need cloud native core.
  • You work on Web, API, Cloud.
  • You also want real time posting.
Finxact review

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Questions people ask

Is Finxact or Keil MDK better?
Neither clearly leads. Finxact starts at On request and Keil MDK at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Finxact or Keil MDK?
Keil MDK has a free tier; the other does not. Paid plans start at On request for Finxact and Free for Keil MDK.
Does Finxact or Keil MDK run on more platforms?
Finxact runs on Web, API, Cloud. Keil MDK runs on Web.
Can I use Keil MDK for free?
Yes. Keil MDK has a free tier, so you can try it without paying. Finxact starts at On request.
What is Finxact best used for?
Finxact is most often used for a united states regional bank replacing a legacy core but unwilling to take supplier viability risk on an independent challenger, a community bank launching an embedded banking or sponsor bank programme on modern rails, an institution already running fiserv card and payment services that wants the core on the same vendor relationship, a bank standing up a new digital brand on a clean core while leaving the existing back book in place. Of those, a united states regional bank replacing a legacy core but unwilling to take supplier viability risk on an independent challenger and a community bank launching an embedded banking or sponsor bank programme on modern rails are not what Keil MDK is typically brought in for.
What can Finxact do that Keil MDK cannot?
Finxact covers Cloud native core, Real time posting, Configurable product definitions, Fiserv ecosystem access.

Answered from the vendors’ own pages

Finxact: Is Finxact still sold under its own name?

Yes. Fiserv acquired it in 2022 and continues to market it as Finxact from Fiserv, winning named core deals with it.

Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

Source
Finxact: Is it genuinely cloud native?

Yes, API first with real time posting on public cloud, rather than a hosted version of a legacy core.

Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

Source
Finxact: How long is a migration?

Plan in years. Even a focused deployment is a multi year programme once integration and data migration are counted.

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