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Mobile Development · head to head

Kotlin Multiplatform vs RevenueCat

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
RevenueCat logo

RevenueCat

Mobile Development

In-app subscription infrastructure billed at 1 percent of tracked revenue measured before the app store takes its cut

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.; RevenueCat the fee is 1 percent of revenue measured before the app store takes 15 or 30 percent, so the effective rate against money you actually receive is closer to 1.2 to 1.4 percent, a distinction that is easy to miss when modelling the cost.
  • They diverge on capability: Kotlin Multiplatform covers Shared Kotlin logic, RevenueCat covers Cross-platform entitlements.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Kotlin Multiplatform and RevenueCat differ
AttributeKotlin MultiplatformRevenueCat
Pricing modelOpen source, no licence feePer month by tracked revenue
PlatformsiOS, Android, Windows, macOS, Linux, WebiOS, Android, Web, React Native, Flutter

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 RevenueCat

  • Cross-platform entitlements
  • Server-side receipt validation
  • Remote paywalls
  • Experiments
  • Revenue charts and cohorts
  • Integrations and webhooks

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 RevenueCat
  • A team that wants shared logic but is not willing to compromise on fully native UI per platformnot RevenueCat
  • An organisation already using Kotlin on the backend that wants to reuse the same models and validation on mobile clientsnot RevenueCat
  • A team evaluating Compose Multiplatform for UI sharing but wanting the option to fall back to native UI per screennot RevenueCat

RevenueCat

  • A small app team shipping subscriptions on both stores without writing two receipt validation backendsnot Kotlin Multiplatform
  • Changing paywall pricing and layout without waiting for app reviewnot Kotlin Multiplatform
  • Running a price experiment and attributing realised revenue rather than checkout events to each variantnot Kotlin Multiplatform
  • Giving finance a single view of subscription revenue across App Store, Google Play and web purchasesnot 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.

RevenueCat

  • The fee is 1 percent of revenue measured before the app store takes 15 or 30 percent, so the effective rate against money you actually receive is closer to 1.2 to 1.4 percent, a distinction that is easy to miss when modelling the cost.
  • The bill scales with success rather than with usage or headcount, so the largest invoice arrives in the month of your best growth, which is exactly when cash is committed elsewhere.
  • At high revenue the arithmetic turns against you: 1 million USD of monthly tracked revenue is 10,000 USD a month, at which point building and staffing receipt validation in-house becomes a serious comparison rather than a hypothetical one.
  • Subscriber and entitlement state lives in the vendor system, so migrating away requires re-validating historical receipts and running dual sources of truth during the transition, and that switching cost grows the longer you stay.
  • Growth features such as paywalls and web funnels are charged at the same 1 percent of what they track, so revenue attributed to those tools is billed even where you already had the infrastructure to handle it.

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

RevenueCat

Free
  • Pro under thresholdFree
    • Free up to 2,500 USD in monthly tracked revenue
    • All product features included
    • No seat charges
  • Pro$undefined/month
    • 1 percent of monthly tracked revenue above 2,500 USD
    • Tracked revenue is measured before the app store commission
    • No minimum commitment stated
  • Enterprise$undefined/year
    • Quoted
    • Volume discounts
    • Flexible tracking configuration

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 RevenueCat if

  • You need cross-platform entitlements.
  • You want to start without paying.
  • You work on iOS, Android, Web, React Native, Flutter.
  • You also want server-side receipt validation.
RevenueCat review

Questions people ask

Is Kotlin Multiplatform or RevenueCat better?
Neither clearly leads. Kotlin Multiplatform starts at Free and RevenueCat at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kotlin Multiplatform or RevenueCat?
Kotlin Multiplatform starts at Free and RevenueCat at Free.
Does Kotlin Multiplatform or RevenueCat run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. RevenueCat runs on iOS, Android, Web, React Native, Flutter.
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 RevenueCat is typically brought in for.
What can Kotlin Multiplatform do that RevenueCat cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. RevenueCat covers Cross-platform entitlements, Server-side receipt validation, Remote paywalls, Experiments.

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.

RevenueCat: Is it really free to start?

Yes, up to 2,500 USD in monthly tracked revenue, with all features included and no seat charges.

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.

RevenueCat: Is the 1 percent taken from gross or net revenue?

Gross. The vendor bases pricing on pre-platform-cut revenue, so the app store commission is not deducted before the fee is calculated.

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.

RevenueCat: What happens if RevenueCat is unavailable?

The SDK caches entitlement state locally so existing subscribers usually keep access, but new purchases and restores depend on the service.

RevenueCat: At what point should I build this in-house?

Somewhere above a few hundred thousand dollars of monthly tracked revenue the annual fee funds engineers, though it also buys cross-platform correctness you then own forever.

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