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Mystral for Mac

Menu bar fan-control utility with custom curves, auto-switching profiles, and live thermal charts.

By fexxdev. Free and open source, MIT licence.

Get it with OpenDMG View source on GitHub

Mystral at a glance

Version
1.1.5
Released
27 August 2026
Download size
2.5 MB
Works on
Apple silicon and Intel
Licence
MIT
Category
Menu Bar and Notch
Developer
fexxdev
GitHub stars
10

About Mystral

A native macOS menu bar app for controlling fan curves on Apple Silicon Macs.

Screenshots

Mystral screenshot 1Mystral screenshot 2Mystral screenshot 3Mystral screenshot 4

How to install Mystral on a Mac

  1. Get OpenDMG. It is a free app store for open source Mac apps. Download OpenDMG.
  2. Search for Mystral and press Get. OpenDMG downloads version 1.1.5 from fexxdev's own GitHub release.
  3. Open it. The download is checked against its SHA-256 fingerprint and its signature is checked on your Mac before it lands in Applications.

Updates to Mystral show up in OpenDMG and install with one button. No account is needed.

Prefer to do it by hand? The developer's file is on GitHub: Mystral-1.1.5.dmg (2.5 MB).

What is new in Mystral 1.1.5

## Fixed

- Prevented a crash after macOS wake when thermal or workspace notifications arrive off the main actor.
- Wake callbacks now reapply fan control on the main actor.

## Added

- Regression tests for thermal and screen-wake notifications delivered from a background queue.

The DMG is ad-hoc signed. On first launch, macOS may require right-clicking Mystral.app and choosing Open.

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