Softwr

APIs · head to head

Bruno vs Kotlin Multiplatform

Bruno logo

Bruno

APIs

Open-source IDE for API exploration with git-friendly collections

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Each has a real cost: Bruno native Git integration, the feature that distinguishes it from cloud API clients, is Pro only at $6 per user per month; 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.
  • They diverge on capability: Bruno covers API Testing, Kotlin Multiplatform covers Shared Kotlin logic.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Bruno and Kotlin Multiplatform differ
AttributeBrunoKotlin Multiplatform
Pricing modelfreemiumOpen source, no licence fee
PlatformsWindows, MacOS, LinuxiOS, Android, Windows, macOS, Linux, Web
CategoryAPIsMobile Development
Founded2022Unknown

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 Bruno

  • API Testing
  • Environment management
  • Git-friendly storage
  • GitHub
  • Git repositories
  • Local file system
  • Windows support
  • MacOS support

Only in Kotlin Multiplatform

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

What people use each for

The jobs each tool is most often brought in to do.

Bruno

  • Sending and testing HTTP requests from a local clientnot Kotlin Multiplatform
  • Keeping API collections in Git rather than a vendor cloudnot Kotlin Multiplatform
  • Offline API development without an accountnot Kotlin Multiplatform
  • Importing and syncing OpenAPI specificationsnot Kotlin Multiplatform

Kotlin Multiplatform

  • A company with existing separate native iOS and Android codebases wanting to stop duplicating business logic and networking codenot Bruno
  • A team that wants shared logic but is not willing to compromise on fully native UI per platformnot Bruno
  • An organisation already using Kotlin on the backend that wants to reuse the same models and validation on mobile clientsnot Bruno
  • A team evaluating Compose Multiplatform for UI sharing but wanting the option to fall back to native UI per screennot Bruno

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Bruno

  • Native Git integration, the feature that distinguishes it from cloud API clients, is Pro only at $6 per user per month
  • OpenAPI syncs are capped at 5 a month on the free tier
  • SSO, SCIM and user management require Ultimate at $11 per user per month
  • Private workspaces are a paid feature
  • Advertised prices are annual rates

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.

Pricing, plan by plan

Bruno

Free
  • Open SourceFree
    • Core API Client
    • Limited Git integration
    • 2 Workspaces
  • Pro$6/month
    • Core API Client
    • Native Git integration
    • Unlimited Workspaces
  • Ultimate$11/month
    • Core API Client
    • Full Git integration
    • Unlimited Workspaces

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

Which should you pick?

Choose Bruno if

  • You need api testing.
  • You want to start without paying.
  • You work on Windows, MacOS, Linux.
  • You also want environment management.
Bruno review

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

Questions people ask

Is Bruno or Kotlin Multiplatform better?
Neither clearly leads. Bruno starts at Free and Kotlin Multiplatform at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bruno or Kotlin Multiplatform?
Bruno starts at Free and Kotlin Multiplatform at Free.
Does Bruno or Kotlin Multiplatform run on more platforms?
Bruno runs on Windows, MacOS, Linux. Kotlin Multiplatform runs on iOS, Android, Windows, macOS, Linux, Web.
Can I use Bruno for free?
Both have a free tier, so you can try either at no cost before committing.
What is Bruno best used for?
Bruno is most often used for sending and testing http requests from a local client, keeping api collections in git rather than a vendor cloud, offline api development without an account, importing and syncing openapi specifications. Of those, sending and testing http requests from a local client and keeping api collections in git rather than a vendor cloud are not what Kotlin Multiplatform is typically brought in for.
What can Bruno do that Kotlin Multiplatform cannot?
Bruno covers API Testing, Environment management, Git-friendly storage, GitHub. Kotlin Multiplatform covers Shared Kotlin logic, Native UI retained, Compose Multiplatform (optional), IDE tooling.

Answered from the vendors’ own pages

Bruno: What is included in Bruno's free tier?

The Open Source plan includes the core API client, limited Git integration, and up to 2 workspaces at no cost. A 14-day free trial of the Ultimate plan is also available without requiring a credit card.

Source
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.

Bruno: What is the difference between Bruno Pro and Ultimate plans?

Pro ($6/month) includes native Git integration and unlimited workspaces. Ultimate ($11/month) adds SSO/SCIM support, audit logs, 24-hour support (vs. 48-hour), and an account manager. Ultimate supports unlimited OpenAPI syncs while Pro is limited to 5 per month.

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.

Bruno: How much does Bruno Pro save compared to other API tools?

The vendor claims Ultimate saves teams more than 70% versus Postman, though this comparison is promotional rather than a specific cost metric.

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.

Share

Related pages

More on Bruno

More on Kotlin Multiplatform

Keep looking

Other head to heads