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Mobile Development · head to head

Kotlin Multiplatform vs Maestro

Kotlin Multiplatform logo

Kotlin Multiplatform

Mobile Development

JetBrains-funded technology for sharing Kotlin business logic across iOS, Android, web, desktop and server

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: Kotlin Multiplatform it shares logic, not UI, by default, so a team expecting a Flutter-style single UI codebase has to also adopt Compose Multiplatform, which is newer and less proven on iOS than on Android.; 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: Kotlin Multiplatform covers Shared Kotlin logic, Maestro covers YAML test flows.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Kotlin Multiplatform and Maestro actually diverge.

Attributes where Kotlin Multiplatform and Maestro differ
AttributeKotlin MultiplatformMaestro
Pricing modelOpen source, no licence feePer concurrent cloud device per month
PlatformsiOS, Android, Windows, macOS, Linux, WebiOS, Android, Web, macOS, Linux, Windows

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Mobile Development).

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 Kotlin Multiplatform

  • Shared Kotlin logic
  • Native UI retained
  • Compose Multiplatform (optional)
  • IDE tooling
  • Gradle-based builds
  • Incremental adoption

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.

Kotlin Multiplatform

  • A company with existing separate native iOS and Android codebases wanting to stop duplicating business logic and networking codenot Maestro
  • A team that wants shared logic but is not willing to compromise on fully native UI per platformnot Maestro
  • An organisation already using Kotlin on the backend that wants to reuse the same models and validation on mobile clientsnot Maestro
  • A team evaluating Compose Multiplatform for UI sharing but wanting the option to fall back to native UI per screennot Maestro

Maestro

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

Where each one falls short

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

Kotlin Multiplatform

  • It shares logic, not UI, by default, so a team expecting a Flutter-style single UI codebase has to also adopt Compose Multiplatform, which is newer and less proven on iOS than on Android.
  • iOS interop relies on Kotlin/Native compiling to a framework consumed from Swift, and debugging across that boundary is more friction than debugging pure Swift or pure Kotlin.
  • Because logic-sharing is the whole premise, teams still need genuine iOS and Android UI expertise on staff; it does not reduce the native skills bar the way a full cross-platform UI framework aims to.
  • Build times and tooling maturity for multiplatform Gradle projects lag behind single-platform Kotlin or Swift projects, and multiplatform-specific build errors are less well documented.
  • JetBrains funds it as part of the broader Kotlin investment, so its roadmap priority competes internally with IntelliJ, Android Studio and other JetBrains commitments rather than having dedicated headcount the way Flutter has at Google.

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

Kotlin Multiplatform

Free
  • Kotlin MultiplatformFree
    • Apache 2.0 licensed, unlimited apps
    • IDE tooling in the free Android Studio and free-tier IntelliJ IDEA Community
    • No paid Kotlin Multiplatform edition exists

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 Kotlin Multiplatform if

  • You need shared kotlin logic.
  • You want to start without paying.
  • You work on iOS, Android, Windows, macOS, Linux, Web.
  • You also want native ui retained.
Kotlin Multiplatform 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 Kotlin Multiplatform or Maestro better?
Neither clearly leads. Kotlin Multiplatform 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, Kotlin Multiplatform or Maestro?
Kotlin Multiplatform starts at Free and Maestro at Free.
Does Kotlin Multiplatform or Maestro run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. Maestro runs on iOS, Android, Web, macOS, Linux, Windows.
Can I use Kotlin Multiplatform for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kotlin Multiplatform best used for?
Kotlin Multiplatform is most often used for a company with existing separate native ios and android codebases wanting to stop duplicating business logic and networking code, a team that wants shared logic but is not willing to compromise on fully native ui per platform, an organisation already using kotlin on the backend that wants to reuse the same models and validation on mobile clients, a team evaluating compose multiplatform for ui sharing but wanting the option to fall back to native ui per screen. Of those, a company with existing separate native ios and android codebases wanting to stop duplicating business logic and networking code and a team that wants shared logic but is not willing to compromise on fully native ui per platform are not what Maestro is typically brought in for.
What can Kotlin Multiplatform do that Maestro cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. Maestro covers YAML test flows, Built-in flakiness tolerance, Maestro Studio, Open source CLI.

Answered from the vendors’ own pages

Kotlin Multiplatform: Does Kotlin Multiplatform replace my native UI code?

Not by default. It shares business logic and data layers; UI stays native per platform unless you separately adopt Compose Multiplatform.

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.

Kotlin Multiplatform: Is there a paid version?

No. It is Apache 2.0 licensed and free, funded by JetBrains as part of the Kotlin project.

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.

Kotlin Multiplatform: Do I need Compose Multiplatform to use it?

No, they are separate. You can share only logic and keep fully native UI on each platform indefinitely.

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.

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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