Mac App

simslim

Run more iOS simulators on one Mac by disabling background daemons the simulator does not need.

Day 43 since launch · Launched 25 August 2026

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What is simslim?

simslim is a Go-based utility that trims the memory and CPU overhead of the iOS Simulator by disabling background daemons a simulator does not need, so you can run more simulator instances on a single Mac. It is built for iOS developers and CI machines that juggle many devices at once and hit resource limits long before Xcode does.

Pros

Lets one Mac run far more iOS simulators in parallel
Simple command-line approach, no complex setup
Open source with an active community of iOS developers

Cons

macOS only, and aimed squarely at iOS developers
Disabling daemons can change simulator behaviour, so test before CI use
Requires comfort with the command line

Who should use simslim

iOS developers and CI operators who need many simulators running on a single Mac.

Who may not need it

Developers who only ever run one simulator at a time.

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