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Mobile Development · head to head

Kotlin Multiplatform vs Refact

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
Refact logo

Refact

Developer Tools

Autonomous AI coding agent for development tasks

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.; Refact requires configuration for optimal performance
  • They diverge on capability: Kotlin Multiplatform covers Shared Kotlin logic, Refact covers Autonomous agent workflows.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Kotlin Multiplatform and Refact differ
AttributeKotlin MultiplatformRefact
Pricing modelOpen source, no licence feeFreemium with paid tiers
PlatformsiOS, Android, Windows, macOS, Linux, WebVS Code, Web
CategoryMobile DevelopmentDeveloper Tools
FoundedUnknown2023

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 Refact

  • Autonomous agent workflows
  • IDE chat
  • Real-time code completions
  • GitHub integration
  • Database integration
  • On-premise deployment
  • Multi-LLM support
  • 25+ language 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 Refact
  • A team that wants shared logic but is not willing to compromise on fully native UI per platformnot Refact
  • An organisation already using Kotlin on the backend that wants to reuse the same models and validation on mobile clientsnot Refact
  • A team evaluating Compose Multiplatform for UI sharing but wanting the option to fall back to native UI per screennot Refact

Refact

  • Autonomous code generation for development tasksnot Kotlin Multiplatform
  • End-to-end bug fixes and refactoringnot Kotlin Multiplatform
  • Multi-language software development accelerationnot Kotlin Multiplatform
  • Enterprise development with data privacy requirementsnot 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.

Refact

  • Requires configuration for optimal performance
  • On-premise deployment adds operational complexity
  • Free tier limited by daily agent request quota
  • Coin system adds complexity to cost calculation

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

Refact

Free
  • FreeFree
    • Limited daily agent usage
    • Unlimited completions
    • 2,000 coins for agent and chat
  • Pro$10/month
    • 40 daily agent requests
    • 64k context window
    • 10,000 coins monthly
  • Enterprise$undefined/custom
    • On-premise deployment
    • Custom coin allocation
    • Fine-tuning support

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 Refact if

  • You need autonomous agent workflows.
  • You want to start without paying.
  • You work on VS Code, Web.
  • You also want ide chat.
Refact review

Questions people ask

Is Kotlin Multiplatform or Refact better?
Neither clearly leads. Kotlin Multiplatform starts at Free and Refact at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kotlin Multiplatform or Refact?
Kotlin Multiplatform starts at Free and Refact at Free.
Does Kotlin Multiplatform or Refact run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. Refact runs on VS Code, Web.
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 Refact is typically brought in for.
What can Kotlin Multiplatform do that Refact cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. Refact covers Autonomous agent workflows, IDE chat, Real-time code completions, GitHub integration.

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.

Refact: How many programming languages does Refact support?

Refact supports 25+ programming languages including Python, JavaScript, Go, Rust, Java, C++, and many others.

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.

Refact: Can I deploy Refact on-premises?

Yes. Refact offers on-premise deployment options for organizations requiring complete data control and privacy.

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.

Refact: What LLMs does Refact support?

Refact works with multiple LLMs including Claude, GPT-4, and open-source models, giving you flexibility in model selection.

Source
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