VAG DPF lite is the free version of the application VAG DPF that show you the most important data related to the DPF particulate filter and its regeneration phases using an ELM327 Bluetooth/WIFI adapter. With this free app you can statically view 3 parameters related to the particulate filter status. This app doesn't use standard OBD2 commands as almost all other apps, it uses directly CAN commands specific of car model and this is the reason why it doesn't work with every car; due to the use of CAN commands, the app needs al least a decent ELM327 adapter (see note below); some users reports correct app working with a 10-15 euro adapter.

VAG DPF forum: https://www.applagapp.com/forum/