Softwr

Mobile Development · head to head

Fastlane vs Kotlin Multiplatform

Fastlane logo

Fastlane

Mobile Development

Open-source automation for building, testing, and releasing iOS and Android apps.

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Each has a real cost: Fastlane requires command-line and Ruby familiarity to configure and maintain Fastfiles.; 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.
  • They diverge on capability: Fastlane covers Screenshot automation, Kotlin Multiplatform covers Shared Kotlin logic.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Fastlane and Kotlin Multiplatform differ
AttributeFastlaneKotlin Multiplatform
Pricing modelopen-sourceOpen source, no licence fee
Platformsios, androidiOS, Android, Windows, macOS, Linux, Web

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 Fastlane

  • Screenshot automation
  • Beta distribution
  • App store publishing
  • Code signing management
  • CI/CD integration
  • Plugin ecosystem

Only in Kotlin Multiplatform

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

What people use each for

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

Fastlane

  • Automating iOS and Android release pipelinesnot Kotlin Multiplatform
  • Generating localized app store screenshotsnot Kotlin Multiplatform
  • Distributing beta builds to testersnot Kotlin Multiplatform
  • Managing code signing across a teamnot Kotlin Multiplatform
  • Integrating mobile releases into CI/CDnot Kotlin Multiplatform

Kotlin Multiplatform

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

Where each one falls short

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

Fastlane

  • Requires command-line and Ruby familiarity to configure and maintain Fastfiles.
  • No hosted UI or dashboard; it is a local/CI toolkit rather than a managed service.
  • Community-maintained plugins vary in quality and maintenance status.
  • No built-in analytics or crash reporting; it must be paired with other tools for those needs.

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.

Pricing, plan by plan

Fastlane

Free

No published plan breakdown. See the Fastlane review.

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

Which should you pick?

Choose Fastlane if

  • You need screenshot automation.
  • You want to start without paying.
  • You work on ios, android.
  • You also want beta distribution.
Fastlane review

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

Questions people ask

Is Fastlane or Kotlin Multiplatform better?
Neither clearly leads. Fastlane starts at Free and Kotlin Multiplatform at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fastlane or Kotlin Multiplatform?
Fastlane starts at Free and Kotlin Multiplatform at Free.
Does Fastlane or Kotlin Multiplatform run on more platforms?
Fastlane runs on ios, android. Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web.
Can I use Fastlane for free?
Both have a free tier, so you can try either at no cost before committing.
What is Fastlane best used for?
Fastlane is most often used for automating ios and android release pipelines, generating localized app store screenshots, distributing beta builds to testers, managing code signing across a team. Of those, automating ios and android release pipelines and generating localized app store screenshots are not what Kotlin Multiplatform is typically brought in for.
What can Fastlane do that Kotlin Multiplatform cannot?
Fastlane covers Screenshot automation, Beta distribution, App store publishing, Code signing management. Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling.

Answered from the vendors’ own pages

Fastlane: Is fastlane a free tool, and what is the licensing model?

Fastlane is open source and free to use. It is an open source platform aimed at simplifying Android and iOS deployment with contributions from over 700 community members.

Source
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.

Fastlane: Does fastlane charge for support or commercial use?

The fastlane website does not mention pricing for support, training, or commercial services. Users are directed to documentation for getting started rather than a purchasing process.

Source
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.

Fastlane: Can fastlane be used in commercial projects?

Yes, fastlane is an open source project. Commercial use is not addressed as a limitation on the website.

Source
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.

Share

Related pages

More on Fastlane

More on Kotlin Multiplatform

Keep looking

Other head to heads