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APIs · head to head

Formance vs Maestro

Formance logo

Formance

APIs

Open source double-entry ledger and payment orchestration for money-moving software

From
Free
Rated
-
Full reviewWebsite
Maestro logo

Maestro

Mobile Development

Open source mobile UI testing with YAML flows, and a cloud priced per concurrent device rather than per test minute

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Formance formance holds no money and provides no regulatory cover, so it must be paired with a payments provider or bank, and buyers occasionally mistake a ledger for a treasury system and discover the gap late.; Maestro cloud pricing is per concurrent device at 250 USD per month, so the cost is driven by how quickly you need the suite to finish rather than by how much you test, and a team wanting a fast pull request gate buys several devices at once.
  • They diverge on capability: Formance covers Double-entry ledger, Maestro covers YAML test flows.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Formance and Maestro actually diverge.

Attributes where Formance and Maestro differ
AttributeFormanceMaestro
Pricing modelOpen source, no licence feePer concurrent cloud device per month
PlatformsLinux, Docker, Kubernetes, Web, APIiOS, Android, Web, macOS, Linux, Windows
CategoryAPIsMobile Development

Identical on both: starting price (Free), free tier (Yes), 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 Formance

  • Double-entry ledger
  • Numscript transaction DSL
  • Multi-currency
  • Payments connectivity
  • Reconciliation
  • Self-hosted deployment
  • Cloud offering
  • API and SDKs

Only in Maestro

  • YAML test flows
  • Built-in flakiness tolerance
  • Maestro Studio
  • Open source CLI
  • Cloud device runs
  • CI and pull request integration

What people use each for

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

Formance

  • A marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditablenot Maestro
  • A fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an auditnot Maestro
  • A payments team that wants one normalised model across several PSPs so reconciliation is not written separately for eachnot Maestro
  • A company that wants its ledger under a licence it can keep running even if the vendor disappearsnot Maestro

Maestro

  • A mobile team replacing an Appium suite that spends more engineering time on maintenance than on new coveragenot Formance
  • Running smoke tests on every pull request without buying and maintaining a physical device labnot Formance
  • Letting a QA specialist who does not write application code author and own the end-to-end suitenot Formance
  • Reproducing a reported bug by recording the exact flow in Studio and committing it as a regression testnot Formance

Where each one falls short

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

Formance

  • Formance holds no money and provides no regulatory cover, so it must be paired with a payments provider or bank, and buyers occasionally mistake a ledger for a treasury system and discover the gap late.
  • Numscript is a domain-specific language your team must learn, and while it makes complex splits expressible it also means transaction logic sits outside the languages your engineers already debug well.
  • Self-hosting a ledger that must never lose or duplicate a transaction is a serious operational commitment covering backups, upgrades and Postgres tuning, which is real cost the zero licence fee hides.
  • Enterprise pricing is not published, so the difference between the free path and the supported path cannot be evaluated without a sales conversation.
  • The company is much smaller than the incumbent alternatives, and while the MIT licence protects the code it does not protect the roadmap, so features on the hosted side may arrive slowly or change direction.

Maestro

  • Cloud pricing is per concurrent device at 250 USD per month, so the cost is driven by how quickly you need the suite to finish rather than by how much you test, and a team wanting a fast pull request gate buys several devices at once.
  • YAML is deliberately limited, so tests with real conditional logic or data-driven permutations end up in embedded scripting blocks where the readability advantage that justified the format disappears.
  • Maestro drives the app as a black box, so it cannot assert on internal state, mock a network layer from inside the process or inspect application memory the way an in-process framework can.
  • The hosted device catalogue is narrower than dedicated device clouds, so testing against a long tail of specific manufacturer builds and older operating system versions still requires another provider.
  • The project rebranded from mobile.dev to Maestro, so a share of existing tutorials, blog posts and links point at old domains and documentation that no longer match the current tooling.

Pricing, plan by plan

Formance

Free
  • Open SourceFree
    • MIT licensed core ledger
    • Numscript transaction DSL
    • Multi-currency tracking
  • Enterprise$undefined/year
    • Managed or private deployment
    • Payments connectivity and reconciliation
    • Support with response commitments

Maestro

Free
  • LocalFree
    • Free and open source CLI
    • Maestro Studio, Viewer and MCP
    • Runs on your own simulators, emulators and devices
  • Cloud$250/month
    • Per device per month
    • Unlimited hosted test runs
    • Hosted Android, iOS and web devices
  • Enterprise Cloud$undefined/year
    • Quoted
    • SSO and dedicated support
    • Custom contracts

Which should you pick?

Choose Formance if

  • You need double-entry ledger.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Web, API.
  • You also want numscript transaction dsl.
Formance review

Choose Maestro if

  • You need yaml test flows.
  • You want to start without paying.
  • You work on iOS, Android, Web, macOS, Linux, Windows.
  • You also want built-in flakiness tolerance.
Maestro review

Questions people ask

Is Formance or Maestro better?
Neither clearly leads. Formance starts at Free and Maestro at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Formance or Maestro?
Formance starts at Free and Maestro at Free.
Does Formance or Maestro run on more platforms?
Formance runs on Linux, Docker, Kubernetes, Web, API. Maestro runs on iOS, Android, Web, macOS, Linux, Windows.
Can I use Formance for free?
Both have a free tier, so you can try either at no cost before committing.
What is Formance best used for?
Formance is most often used for a marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditable, a fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an audit, a payments team that wants one normalised model across several psps so reconciliation is not written separately for each, a company that wants its ledger under a licence it can keep running even if the vendor disappears. Of those, a marketplace splitting a single customer payment between seller, platform fee and tax that needs the split to be atomic and auditable and a fintech whose homegrown balances table produced numbers finance could not reconcile and now needs proper double-entry before an audit are not what Maestro is typically brought in for.
What can Formance do that Maestro cannot?
Formance covers Double-entry ledger, Numscript transaction DSL, Multi-currency, Payments connectivity. Maestro covers YAML test flows, Built-in flakiness tolerance, Maestro Studio, Open source CLI.

Answered from the vendors’ own pages

Formance: Is Formance really open source?

Yes. The core ledger is MIT licensed with full source access and no deployment restrictions.

Maestro: Is Maestro free?

The CLI, Studio and local execution are free and open source. The hosted device cloud is 250 USD per device per month.

Formance: Does Formance move money?

No. It records and orchestrates movements; the actual payments happen at a PSP or bank you connect.

Maestro: What exactly does per device mean?

It is a concurrency slot. One device runs one test at a time, so suite duration is a function of how many devices you buy.

Formance: What does the enterprise version cost?

Not published. It is an annual subscription quoted per customer.

Maestro: How does it compare with Appium?

Tests are YAML rather than code and flakiness handling is built in, which reduces maintenance, at the cost of lower-level control.

Formance: Do I have to use Numscript?

Yes for anything beyond the simplest transfers. It is how multi-party transactions are expressed atomically.

Maestro: Can it test web applications too?

Yes, the cloud offers hosted web devices alongside Android and iOS, though the product centre of gravity is mobile.

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