crafcat7/peakmon

Peakmon is a small macOS app that lives in the menu bar at the top of the screen and shows live readings of how your Mac is doing. It can display CPU usage, GPU usage, memory, battery, disk activity, network traffic, and the processes that are using the most resources. The README describes it as a lighter alternative to Activity Monitor, with no Electron wrapper and no telemetry sent anywhere. The project is written entirely in Swift, using Apple's own SwiftUI framework for the interface and Swift Concurrency for background work. The README is explicit that it avoids common third-party libraries and older Apple APIs such as Combine and NSTimer. The authors say it is designed Apple Silicon first, meaning Macs with the newer M-series chips, and uses Apple-specific system services to read sensor data. Intel Macs are supported on a best-effort basis. To install it, you can either run a Homebrew command (a popular package installer for Mac developers) or download a pre-built .app file from the GitHub Releases page and drag it into Applications. The README warns that the app sandbox is turned off, because the program needs deeper access to system information than sandboxed apps are allowed, and that the signing is ad-hoc, so on first launch you have to right-click the icon and choose Open to get past Apple's Gatekeeper warning. A Mac App Store version is not planned. The codebase is split into smaller Swift Packages: PeakmonCore for shared models and the scheduler, PeakmonCollectors for the individual metric readers, and PeakmonUI for reusable view code. Contributors are asked to use Swift 6.2 or newer, to run a linter called swiftlint in strict mode before submitting changes, and to follow Conventional Commits for commit messages. The README states that only one component is allowed to poll the system for new readings, and views read from a shared store, which keeps the data flow simple. The project is released under the Apache License 2.0.