Softwr

Mobile Development · head to head

Kotlin Multiplatform vs WebStorm

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
WebStorm logo

WebStorm

Technology

The JavaScript and TypeScript IDE

From
$12.9/month
Rated
-
Full reviewWebsite

The short version

  • Only Kotlin Multiplatform has a free tier, so it costs nothing to try first.
  • 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.; WebStorm jetBrains WebStorm is sold as an annual subscription rather than a one-time purchase: commercial price is $199 per year (USD), and personal price starts at $299 in year one, dropping to $239 in year two and $179 from year three onward with continuous renewal.
  • They diverge on capability: Kotlin Multiplatform covers Shared Kotlin logic, WebStorm covers Smart JavaScript editor.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Kotlin Multiplatform and WebStorm differ
AttributeKotlin MultiplatformWebStorm
Starting priceFree$12.9/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsiOS, Android, Windows, macOS, Linux, WebWindows, Macos, Linux
CategoryMobile DevelopmentTechnology
FoundedUnknown2000

Identical on both: 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 WebStorm

  • Smart JavaScript editor
  • TypeScript support
  • Node.js development
  • Modern framework support
  • Built-in debugger
  • Unit testing
  • Version control
  • Live templates

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

WebStorm

  • Web application developmentnot Kotlin Multiplatform
  • React/Angular/Vue developmentnot Kotlin Multiplatform
  • Node.js backend developmentnot Kotlin Multiplatform
  • TypeScript projectsnot Kotlin Multiplatform
  • Frontend testingnot 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.

WebStorm

  • JetBrains WebStorm is sold as an annual subscription rather than a one-time purchase: commercial price is $199 per year (USD), and personal price starts at $299 in year one, dropping to $239 in year two and $179 from year three onward with continuous renewal.
  • If the subscription lapses, use of new versions stops; JetBrains grants a fallback license only for the last version used while the subscription was active, per its published buy page.

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

WebStorm

$12.9/month
  • Individual$12.9/month
    • Intelligent JavaScript & TypeScript editor
    • Debugging and testing
    • VCS integration
  • Organizations$25.9/month
    • All Individual features
    • Commercial use license
    • Centralized license management

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 WebStorm if

  • You need smart javascript editor.
  • You work on Windows, Macos, Linux.
  • You also want typescript support.
WebStorm review

Questions people ask

Is Kotlin Multiplatform or WebStorm better?
Neither clearly leads. Kotlin Multiplatform starts at Free and WebStorm at $12.9/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kotlin Multiplatform or WebStorm?
Kotlin Multiplatform has a free tier; the other does not. Paid plans start at Free for Kotlin Multiplatform and $12.9/month for WebStorm.
Does Kotlin Multiplatform or WebStorm run on more platforms?
Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web. WebStorm runs on Windows, Macos, Linux.
Can I use Kotlin Multiplatform for free?
Yes. Kotlin Multiplatform has a free tier, so you can try it without paying. WebStorm starts at $12.9/month.
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 WebStorm is typically brought in for.
What can Kotlin Multiplatform do that WebStorm cannot?
Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling. WebStorm covers Smart JavaScript editor, TypeScript support, Node.js development, Modern framework support.

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.

WebStorm: Is there a free version of WebStorm?

Yes, WebStorm is free for non-commercial use and includes access to JetBrains AI with a free tier.

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.

WebStorm: What is the cost of a commercial WebStorm license?

The page references a testimonial mentioning 70 euros as a cost, though specific current pricing requires visiting the dedicated pricing page.

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.

WebStorm: How does JetBrains AI licensing work?

Users can pay with JetBrains AI credits, bring their own AI subscriptions and API keys to avoid vendor lock-in, or use the free tier included with WebStorm.

Source
WebStorm: What features does the free tier include?

The free tier includes the smart code editor, navigation tools, integrated developer tools, and customization options.

Source
Share

Related pages

More on Kotlin Multiplatform

More on WebStorm

Keep looking

Other head to heads