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Helping Decision-Makers Say Yes to Kotlin Multiplatform (KMP)

Authors
Ekaterina Volodko
Source
RSS
Published
Collection
Cross Platform
Kotlin MultiplatformCross Platform MobileShared Business LogicNative UIEngineering Productivity
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Summary

This post argues that Kotlin Multiplatform helps companies cut duplicate mobile work by sharing business logic across iOS, Android, and sometimes web while keeping native UI. The evidence is a set of case-study claims from JetBrains and Touchlab clients rather than a controlled research evaluation.

Problem

  • Separate iOS and Android codebases duplicate business logic, create feature lag between platforms, and raise maintenance cost.
  • Duplicated logic increases regression risk because fixes and rule changes must be implemented and verified more than once.
  • Platform-specific teams can slow onboarding, reduce staffing flexibility, and make cross-platform product launches harder to coordinate.

Approach

  • Use Kotlin Multiplatform to place business logic, data models, and calculations in a shared Kotlin module while each platform keeps its native UI.
  • Build and verify the core logic once, then connect that shared code to iOS, Android, and in some cases web front ends.
  • Start with a pilot in pure logic-heavy areas such as calculations, business rules, and data handling, where the article estimates about 75% sharing potential.
  • The claimed mechanism is simple: one implementation of core rules reduces duplicate coding, duplicate testing, and platform drift.

Results

  • The post says many organizations see ROI in 3–6 months, but it does not provide a study design, sample size, or a benchmark method.
  • Blackstone reportedly achieved a 50% increase in implementation speed within 6 months while sharing about 90% of business logic.
  • Duolingo reportedly spent 5 engineer-months to adopt KMP and ship iOS for Adventures, then 1.5 engineer-months to ship web using the same KMP codebase, compared with 9 engineer-months for the initial Android implementation; the article also claims 6–12 engineer-months saved.
  • Bitkey reportedly shares 95% of its mobile codebase with KMP.
  • Forbes reportedly consolidated 80%+ of logic across platforms and about 90% of business logic overall.
  • Philips reportedly cut cross-platform feature development time by about 50%, and the post also claims onboarding time often drops by 30–50%.

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