# cashapp/zipline

Run Kotlin/JS libraries in Kotlin/JVM and Kotlin/Native programs

Repository: https://github.com/cashapp/zipline
Canonical: https://ross.abutalabs.com/products/cashapp-zipline
Language: C
License: Apache-2.0
License Family: permissive
Last push: 2026-08-26T17:20:45+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 65, longevity 100
- inputs: {"age_days": 4025, "days_push": 7, "days_rel": 153, "gap_med": 43, "n_releases_24m": 12}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2298, forks 208 (observed 2026-08-28T04:06:35.277626+00:00)

## What it is
Zipline is a Kotlin library that lets Kotlin/JVM and Kotlin/Native programs load and run Kotlin/JS code by embedding the QuickJS JavaScript engine. It enables fetching executable code as easily as fetching data, supporting dynamic updates to app logic without app store releases.

## Use cases
- run dynamically downloaded business logic in a mobile app without an app store update
- build a plugin system where users can customize app behavior with Kotlin/JS scripts
- update pricing or payment rules in production apps continuously
- serve fresh daily content like trivia questions or games from a server
- execute sandboxed JavaScript inside a Kotlin/JVM or Kotlin/Native application

## When to choose
- you need to hot-update parts of a Kotlin Multiplatform mobile app without waiting for app store review
- you want a safe embedded scripting/plugin system in a JVM or native Kotlin host
- your business rules change frequently and must be deployed server-side

## When to avoid
- your app logic rarely changes and app store release cycles are acceptable
- you need to run JavaScript in a browser or Node.js environment rather than embedded in a native/JVM host
- you require full native performance for the dynamic code rather than an interpreted engine

## Facets
- artifact type: library
- maturity: active
- function: interpreter, plugin-system, serialization, sdk
- domain: developer-tools, mobile-development, cross-platform, programming-languages
- platform: jvm
- tags: kotlin-multiplatform, quickjs, javascript-engine, dynamic-code-loading, code-hosting, continuous-deployment, android, ios

## Member repositories
- cashapp/zipline (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:35.277626+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:40:17.051616+00:00, confidence not recorded.
  - readme: https://github.com/cashapp/zipline (fetched 2026-08-28T04:06:35.277626+00:00, sha a88434511f0a)
- Data as of 2026-08-30T08:39:29.467469+00:00.