Release 2025.12.11 is now out on Google Play, F-Droid, and the iOS AppStore. Updates include adding & editing charging sockets for electrical vehicles in #openStreetMap and a UX refresh to Material 3 on Android.
See all details here: https://www.comaps.app/news/2025-12-14/Release-2025.12.11-notes/
I think processing GTFS data offline and on-device might be really challenging. There’s OpenTripPlanner, which is web-based and can be self-hosted on a VPS (an example).