According to the devs, CarLetter wasn’t just another buggy mirroring app. It was the "top" solution for bypassing the standard restrictions. It promised to let users run any app—YouTube for the kids on road trips, custom diagnostic gauges, and even web browsers—directly through the Android Auto interface.

: It allows users to mirror any content from their phone to the car's central control screen.

The Play Store offered the usual suspects: voice recorders that stopped when the car moved, note apps with microscopic text, and "safe driving" tools that felt like digital nannies.