You can use your Mobility Budget to book all mobility services of the REACH NOW App and other REACH NOW apps (e.g. SSB BestPreis, SSB Flex, KVV.mobil). These services include tickets for the SSB/VVS, KVV, VRR/Rheinbahn, AVG and bookings of trips with SHARE NOW(formerly car2go), FREE NOW (formerly mytaxi) and nextbike.
Please note that you can not use your Mobility Budget in other apps of these providers (e.g. SHARE NOW, DriveNow, FREE NOW, nextbike, independent apps of the public transport organizations), as these require a separate user account.
At the moment these services are only available in Germany.