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APIs · head to head

Ozone API vs Temenos Transact

Ozone API logo

Ozone API

APIs

Standards-compliant open banking API layer for banks and regulators

From
On request
Rated
-
Full reviewWebsite
Temenos Transact logo

Temenos Transact

APIs

Established core banking system used by banks in over a hundred countries

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Ozone API it provides the API layer, not the core connectivity, so the bulk of the project is still integrating your own core banking systems and that cost is not in the licence.; Temenos Transact the codebase originates in the 1990s, so banks on older releases face major upgrade programmes to reach current versions, and many defer them for years.
  • They diverge on capability: Ozone API covers Multi-standard support, Temenos Transact covers Country model banks.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Ozone API and Temenos Transact actually diverge.

Attributes where Ozone API and Temenos Transact differ
AttributeOzone APITemenos Transact
PlatformsWeb, REST API, LinuxWeb, Linux, Windows, REST API

Identical on both: starting price (On request), pricing model (quote), 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 Ozone API

  • Multi-standard support
  • Consent management
  • Developer portal
  • Regulatory reporting
  • Premium API monetisation
  • Deployment flexibility

Only in Temenos Transact

  • Country model banks
  • Multi-product core
  • Payments processing
  • API layer
  • Cloud deployment
  • Accounting engine

What people use each for

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

Ozone API

  • A building society facing an open banking compliance deadline with no API team of its ownnot Temenos Transact
  • A bank operating in several jurisdictions that must satisfy different open banking standards at oncenot Temenos Transact
  • A regulator or standards body building national open finance infrastructurenot Temenos Transact
  • A bank wanting to sell premium APIs beyond the regulatory minimum without building entitlement plumbingnot Temenos Transact

Temenos Transact

  • A bank in an emerging market needing local regulatory compliance without building it from scratchnot Ozone API
  • An institution running Islamic banking products alongside conventional ones on one corenot Ozone API
  • A bank that needs a large pool of experienced implementation consultants to de-risk a migrationnot Ozone API
  • A group standardising subsidiaries in several countries onto one core banking systemnot Ozone API

Where each one falls short

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

Ozone API

  • It provides the API layer, not the core connectivity, so the bulk of the project is still integrating your own core banking systems and that cost is not in the licence.
  • Value is driven by regulatory obligation, so an institution not under a mandate struggles to build a business case for the spend.
  • It is a small UK vendor selling to large regulated institutions, which raises procurement and vendor viability questions during bank due diligence.
  • Premium API monetisation is a genuine capability but few banks have found real demand, so revenue projections used to justify the purchase often do not materialise.
  • Standards evolve continuously and each revision means a change programme in your own systems, even where Ozone absorbs the specification work at the API edge.

Temenos Transact

  • The codebase originates in the 1990s, so banks on older releases face major upgrade programmes to reach current versions, and many defer them for years.
  • Total cost is dominated by implementation partner fees rather than licence, and those programmes routinely overrun their original estimates.
  • Product changes that cloud-native cores treat as configuration can require development work and a release cycle, which slows time to market for new products.
  • Heavy customisation is common and it makes every subsequent upgrade harder, creating a compounding cost that banks feel a decade after go-live.
  • Temenos has repeatedly restructured its product line and naming, so buyers must check carefully which components a proposal actually includes and which are separately licensed.

Pricing, plan by plan

Ozone API

On request
  • Ozone API$undefined/year
    • Annual licence or managed service subscription, quoted
    • Scaling by institution size, standards in scope and API call volume
    • Implementation and core integration charged separately

Temenos Transact

On request
  • Temenos Transact$undefined/year
    • Perpetual or subscription licence scaled by assets, accounts or users
    • Annual maintenance typically a percentage of licence value
    • Implementation delivered by partners and charged separately

Which should you pick?

Choose Ozone API if

  • You need multi-standard support.
  • You work on Web, REST API, Linux.
  • You also want consent management.
Ozone API review

Choose Temenos Transact if

  • You need country model banks.
  • You work on Web, Linux, Windows, REST API.
  • You also want multi-product core.
Temenos Transact review

Questions people ask

Is Ozone API or Temenos Transact better?
Neither clearly leads. Ozone API starts at On request and Temenos Transact at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ozone API or Temenos Transact?
Ozone API starts at On request and Temenos Transact at On request.
Does Ozone API or Temenos Transact run on more platforms?
Ozone API runs on Web, REST API, Linux. Temenos Transact runs on Web, Linux, Windows, REST API.
What is Ozone API best used for?
Ozone API is most often used for a building society facing an open banking compliance deadline with no api team of its own, a bank operating in several jurisdictions that must satisfy different open banking standards at once, a regulator or standards body building national open finance infrastructure, a bank wanting to sell premium apis beyond the regulatory minimum without building entitlement plumbing. Of those, a building society facing an open banking compliance deadline with no api team of its own and a bank operating in several jurisdictions that must satisfy different open banking standards at once are not what Temenos Transact is typically brought in for.
What can Ozone API do that Temenos Transact cannot?
Ozone API covers Multi-standard support, Consent management, Developer portal, Regulatory reporting. Temenos Transact covers Country model banks, Multi-product core, Payments processing, API layer.

Answered from the vendors’ own pages

Ozone API: Is this a competitor to Plaid or TrueLayer?

No, the opposite side. Ozone is bought by the bank exposing data; Plaid and TrueLayer consume it on behalf of third parties.

Temenos Transact: Is Transact the same as T24?

Yes. T24 was renamed Temenos Transact; older installations and much of the consultant population still use the T24 name.

Ozone API: Does it connect to my core banking system?

It provides the standards-compliant API surface and adapters, but connecting your core is an integration project you scope separately.

Temenos Transact: Can it run in the cloud?

Yes, it is offered on public cloud, though many existing installations remain on-premises and moving them is a project.

Ozone API: Which standards does it support?

UK Open Banking, Berlin Group, FDX, Consumer Data Right and Gulf regional standards, among others, from one platform.

Temenos Transact: What drives the cost?

Licence scaled by size, annual maintenance as a percentage of licence, and implementation partner fees that usually exceed the software cost.

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