The best open source alternative to MacKeeper is Pearcleaner. If that doesn't suit you, we've compiled a ranked list of other open source MacKeeper alternatives to help you find a suitable replacement. Other interesting open source alternative to MacKeeper is BleachBit.
MacKeeper alternatives are mainly Productivity & Utilities but may also be Application Security Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of MacKeeper.
A free Mac app cleaner that removes leftover files, strips universal app architectures, manages launch agents, and includes Finder integration with drag/drop support.

Pearcleaner is a powerful and completely free Mac app cleaner that goes far beyond simple app removal. Born from the need for a comprehensive macOS cleaning solution, this open-source tool helps you reclaim valuable disk space by finding and removing leftover files that standard uninstalls leave behind.
Key benefits include:
The app features drag-and-drop simplicity, deep link automation support, and a customizable theme system. With its tiny 210KB sentinel monitor using just 2MB of RAM, Pearcleaner works silently in the background. Licensed under Apache 2.0 with Commons Clause, ensuring it remains free forever while preventing commercialization.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
BleachBit frees disk space & protects privacy by deleting cache, cookies, history & temp files from Firefox, Chrome & more. Open source for Linux/Windows.

BleachBit is a powerful system cleaner designed for both Linux and Windows platforms. It helps you free up disk space quickly and efficiently while ensuring your privacy is safeguarded. With BleachBit, you can clear cache, delete cookies, erase Internet history, shred temporary files, delete logs, and eliminate other junk files you weren't even aware of.
BleachBit supports thousands of applications, including popular ones like: Firefox, Adobe Flash, Google Chrome, Opera and more. Beyond simple file deletion, BleachBit offers advanced features to ensure thorough cleaning and data protection.
Key Features:
BleachBit is not just free but also open-source, allowing users to contribute and improve it continually. Its comprehensive features make it a valuable tool for anyone looking to maintain a clean and efficient system while protecting their privacy.