X-Prolog is a lightweight Prolog system intended to facilitate programming in Prolog on Android. The app runs Prolog programs in a text view, web view or as a bound service to a client app. A sample client is available at https://github.com/xprolog/sample-client.

Note that Google Play restricts the use of all-file-access permission in apps targeting Android 11 or later. To install X-Prolog with all-file-access permission, refer to https://github.com/xprolog/xp/releases.