ACMarket is a third-party app store for Android devices, offering an alternative source for apps and games that may be unavailable or restricted in the Google Play Store. Its library includes modded games, paid apps, older software versions, and titles with regional restrictions. The site describes a collection of more than one million apps and games across categories such as gaming, productivity, entertainment, education, and utilities.

The ACMarket app is presented as free to use, with no subscription, account, or Google sign-in required. It runs on Android 5.0 and later without root access, and can also be used on a PC through an Android emulator or on Amazon Firestick. Features include app search and category browsing, user ratings and reviews, download queues, and access to previous versions of some apps. The site offers the ACMarket APK for download and describes regular updates to the store. Users should note that third-party APKs and modified apps can carry security and account risks; the site recommends downloading from a trusted source and scanning installed files.