MobAI-App GitHub avatar

simslim

MobAI-App

simslim reduces iOS simulator memory usage by 4x by disabling unnecessary background daemons, allowing many more simulators to run on a single Mac.

Stars

248

7-day growth

+83

Forks

10

Open issues

0

License

MIT

Last updated

2026-07-24

AI repository intelligence
FR-AI / ANALYSIS

Why it is worth attention

It solves a practical scaling bottleneck for iOS testing — enabling 19 simulators on a 16 GB Mac by cutting per-simulator memory from 4 GB to 0.9 GB, backed by measured results and a safe, persistent daemon-disabling approach.

Who it is for

  • iOS developers
  • CI/CD engineers
  • Test automation engineers
  • QA teams needing parallel simulator setups

Use cases

  • Running multiple simulators on a single machine for parallel testing
  • Reducing CI runner costs by fitting more simulators per host
  • Developing and testing on resource-constrained laptops
  • Cloning simulators with preserved slimming for reproducible CI profiles

Strengths

  • Measured 4x memory reduction (from 4 GB to 0.9 GB per simulator)
  • Persistent per-simulator state that survives reboots
  • Safe daemon allowlist – core services remain running
  • Provides both CLI and GUI app, plus a Go library with no external dependencies

Considerations

  • macOS only and requires Xcode with iOS simulator runtime
  • Disabling daemons breaks features like Spotlight, push notifications, and universal links
  • CI shared runners may hit timeout during the reconfiguration process; requires tuning --boot-timeout

README quick start

Usage

Description

Run more iOS simulators on one Mac by disabling background daemons a simulator doesn't need

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