Press kit
Fact sheet
| Name | Rein for Mac |
|---|---|
| Maker | An independent developer |
| What | A menu-bar app that puts the controls macOS hides on one panel |
| Jobs | Keep-awake and sleep rules, fan curves, battery charge limit, per-app audio and EQ with a loopback device, display brightness including XDR, colour calibration to an ICC profile, menu-bar tidy, casting to Chromecast and AirPlay, and a free iPhone remote |
| Requires | Apple Silicon, macOS 14 or later, tested on macOS 26.6 and 27.0.1; the remote needs iOS 17 or later |
| Price | £22 once, after a 7-day trial with every feature and no card |
| Privacy | No accounts, no analytics, no telemetry; one daily version check, which can be switched off. Everything it sends |
| Safety | Every override returns to macOS defaults on quit, on crash and on Reset to Auto |
| Battery | On the firmware that ships with macOS 26.7, 15.8 and 27, Rein sets Apple’s own 80 to 100 percent limit, by hand, preset or rule, and holds any level below 80 while the Mac is awake; on earlier macOS it pauses charging in place at any level from 20 percent. Top-up, discharge, health history. Tested on an M2 Pro MacBook Pro on macOS 26.6 and 27.0.1 |
| Distribution | Direct download, signed with a Developer ID and notarised by Apple; not on the Mac App Store, because it needs a privileged helper |
| Built with | SwiftUI and AppKit, Swift 6, and AI coding tools, by one person |
| Versions | 1.0 on 5 October 2026, after 25 public test releases from 27 July 2026; 1.0.1 on 8 October 2026 (macOS 27) |
| Contact | tidbit-people.1u@icloud.com |
In 50 words
Rein puts the controls macOS hides on one menu-bar panel: keep-awake with the lid closed, fan curves, per-app audio, brightness to XDR, casting to Chromecast and AirPlay, a free iPhone remote, and Apple’s charge limit held by your rules. No accounts, no analytics. Quit, and your Mac is stock again.
In 100 words
Rein is a menu-bar app for Apple Silicon Macs that puts the controls macOS hides on one panel. Keep the Mac awake with the lid closed, on a timer or while an app runs. Set a fan curve. Set each app’s volume and EQ, route audio, record any app. Push brightness to XDR, calibrate the display, tidy the menu bar. Cast 4K to a Chromecast or AirPlay TV, with a free iPhone remote. Hold a charge limit, Apple’s own on macOS 27, by rule. No accounts, no analytics. Quit, and it is stock again. £22 once, after a 7-day trial.
Images
Real screenshots of the app; click one for the full-size file.
Links
- Website: undercoverzest.app/rein
- Download: the latest Rein.dmg
- Rein Remote: App Store