Point the phone at the exhaust from 30–50 cm and the RPM tab turns its sound into engine speed on a big dial, with a ± value.<br>Idle steadiness runs a 10, 20 or 30 s test and reports average, ± SD and drift.<br>Garage keeps your engines with Targets from the manual and saved readings.
Only the current version so far — new entries appear as the app ships updates.
Engine RPM: Tachometer & Idle is an auto & vehicles app by Global Utility App Maker with 10+ downloads (about 33 estimated). +33 installs in the last 7 days. Released Oct 28, 2026. Install growth, rank history, SDKs and ad networks.
From the store listing: “Engine tachometer from exhaust sound: target RPM band, idle test, rev counter”
