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Mobile Development · head to head

Kotlin Multiplatform vs PocketBase

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
PocketBase logo

PocketBase

APIs

Open-source backend with REST API, real-time subscriptions and Admin UI

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.; PocketBase requires technical expertise to deploy and maintain
  • They diverge on capability: Kotlin Multiplatform covers Shared Kotlin logic, PocketBase covers REST API.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Kotlin Multiplatform and PocketBase differ
AttributeKotlin MultiplatformPocketBase
Pricing modelOpen source, no licence feeUnknown
PlatformsiOS, Android, Windows, macOS, Linux, WebLinux, Windows, macOS, FreeBSD
CategoryMobile DevelopmentAPIs
FoundedUnknown2021

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 Kotlin Multiplatform

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

Only in PocketBase

  • REST API
  • Real-time subscriptions
  • Admin UI
  • SQLite
  • Webhooks
  • File storage
  • Go support
  • Docker support

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

PocketBase

  • Embedded realtime database with REST APInot Kotlin Multiplatform
  • Backend-as-a-service for single-file deploymentsnot Kotlin Multiplatform
  • Rapid application development with email/OAuth2 authenticationnot Kotlin Multiplatform
  • File storage and media attachment managementnot Kotlin Multiplatform
  • Lightweight alternative to Firebase or traditional backend infrastructurenot Kotlin Multiplatform
  • Go and JavaScript customisable application frameworknot 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.

PocketBase

  • Requires technical expertise to deploy and maintain
  • No built-in hosting provided
  • Community support only

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

PocketBase

Free

No published plan breakdown. See the PocketBase review.

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 PocketBase if

  • You need rest api.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, FreeBSD.
  • You also want real-time subscriptions.
PocketBase review

Questions people ask

Is Kotlin Multiplatform or PocketBase better?
Neither clearly leads. Kotlin Multiplatform starts at Free and PocketBase at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kotlin Multiplatform or PocketBase?
Kotlin Multiplatform starts at Free and PocketBase at Free.
Does Kotlin Multiplatform or PocketBase run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. PocketBase runs on Linux, Windows, macOS, FreeBSD.
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 PocketBase is typically brought in for.
What can Kotlin Multiplatform do that PocketBase cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. PocketBase covers REST API, Real-time subscriptions, Admin UI, SQLite.

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.

PocketBase: How much does PocketBase cost?

PocketBase is completely free and open-source. It is a self-hosted backend solution with database, authentication, and file storage capabilities at no cost.

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.

PocketBase: Is PocketBase open-source?

Yes, PocketBase is open-source software. You can download, modify, and deploy it yourself at no cost with no licensing restrictions.

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.

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