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Mobile Development · head to head

Kotlin Multiplatform vs Penpot

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
Penpot logo

Penpot

Developer Tools

Open source design and prototyping platform

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.; Penpot smaller user base and community compared to Figma means fewer templates and resources
  • They diverge on capability: Kotlin Multiplatform covers Shared Kotlin logic, Penpot covers Vector editing.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Kotlin Multiplatform and Penpot differ
AttributeKotlin MultiplatformPenpot
Pricing modelOpen source, no licence feeUnknown
PlatformsiOS, Android, Windows, macOS, Linux, WebWeb, Windows, macOS, Linux
CategoryMobile DevelopmentDeveloper Tools
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 Penpot

  • Vector editing
  • Interactive prototyping
  • Design systems
  • Components & libraries
  • Real-time collaboration
  • SVG support
  • CSS Grid & Flexbox
  • Code export

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

Penpot

  • UI/UX designnot Kotlin Multiplatform
  • Prototypingnot Kotlin Multiplatform
  • Design systemsnot Kotlin Multiplatform
  • Developer handoffnot Kotlin Multiplatform
  • Open source projectsnot 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.

Penpot

  • Smaller user base and community compared to Figma means fewer templates and resources
  • Self-hosting requires Linux server and Docker knowledge for technical setup
  • Real-time collaboration features may have performance issues with very large design files

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

Penpot

Free
  • FreeFree
    • Cloud-based design
    • Real-time collaboration
    • Components and variants
  • Unlimited$7/month
    • All free features
    • Priority support
    • Advanced cloud features
  • Enterprise$950/month
    • Custom enterprise features
    • Dedicated support
    • Advanced security

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 Penpot if

  • You need vector editing.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux.
  • You also want interactive prototyping.
Penpot review

Questions people ask

Is Kotlin Multiplatform or Penpot better?
Neither clearly leads. Kotlin Multiplatform starts at Free and Penpot at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kotlin Multiplatform or Penpot?
Kotlin Multiplatform starts at Free and Penpot at Free.
Does Kotlin Multiplatform or Penpot run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. Penpot runs on Web, Windows, macOS, Linux.
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 Penpot is typically brought in for.
What can Kotlin Multiplatform do that Penpot cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. Penpot covers Vector editing, Interactive prototyping, Design systems, Components & libraries.

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.

Penpot: Is Penpot really free?

Yes. Penpot is completely free with no feature gates. The open-source version can be self-hosted on your own infrastructure for zero cost beyond server expenses.

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.

Penpot: Can I self-host Penpot?

Yes. Penpot can be self-hosted on your own infrastructure with no licensing costs. Organizations with specific privacy or governance needs can run Penpot on their own servers.

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.

Penpot: What are the paid plans if I use Penpot cloud?

Penpot's cloud service offers a free tier, Unlimited plan at $7 per user per month for professionals and medium teams, and Enterprise starting at $950 per month for larger organizations.

Source
Penpot: What platforms does Penpot support?

Penpot runs in the browser, so it works on Windows, Mac, Linux, and any OS with a web browser. No platform-specific downloads required.

Source
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