Acoustic Tachometer
Jan Sokol Utilities iPhoneiPadiPod touch
Acoustic Tachometer is a free Utilities app for iPhone and iPad by Jan Sokol. Requires iOS 26.0. Updated October 6, 2026.
- Price
- Free
- on the App Store
- Size
- 9 MB
- Age 4+
- Updated
- Oct 6
- 2026 · v2.0
Screenshots
About Acoustic Tachometer
Acoustic Tachometer estimates engine RPM from exhaust or engine sound using your iPhone microphone. Choose an engine profile, start listening, and watch the app lock onto the dominant firing frequency. The app reports RPM, confidence, harmonic support, and candidate frequencies so you can tune idle speed, compare engine behavior, and capture repeatable measurements without attaching hardware. Built for quick checks on cars, motorcycles, small engines, and rotary engines where a contact tachometer is inconvenient.
What’s new
Version 2.0 · Updated October 6, 2026
Measure engine RPM with a redesigned instrument dashboard, a clearer live gauge, and a Garage for your machines and saved readings. New • Follow revs (beta): after a stable idle lock, follow rising engine speed on supported evenly firing engines. V8 and V-twin profiles remain limited to idle measurements. • Customize your app with six alternate icons, available with Pro. Improved • Read RPM trends more easily with labeled time and RPM axes, and see peak RPM while following revs. • Enjoy an updated layout with improved rotation on iPad. • Benefit from updated engine-sound analysis and signal evidence. Fixed • Choosing PDF report, CSV, or JSON backup now opens the share sheet immediately. PDF and CSV exports require Pro; JSON backup is free. • Deleting a saved reading now asks for confirmation.
App privacy
The developer, Jan Sokol, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
Alternatives to Acoustic Tachometer
Looking for apps like Acoustic Tachometer? Here are 6 similar apps on the App Store. The highest rated is Strobe tachometer (RPM meter) (4.3/5), and all 6 are free to download.
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SoundRPM: Engine Tachometer
3.0
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SoundTach
3.5
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TachoCamera
-
Motor Pitch Analyzer
1.0
-
Strobe Light – RPM
2.0
-
Strobe tachometer (RPM meter)
4.3
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Acoustic Tachometer | – | Free | October 6, 2026 | |
| SoundRPM: Engine Tachometer | 3.0 / 5 (2) | Free | Oct 3, 2026 | Compare |
| SoundTach | 3.5 / 5 (8) | Free | Apr 29, 2026 | Compare |
| TachoCamera | – | Free | Oct 13, 2026 | Compare |
| Motor Pitch Analyzer | 1.0 / 5 (1) | Free | Jun 12, 2025 | Compare |
| Strobe Light – RPM | 2.0 / 5 (1) | Free | Sep 12, 2026 | Compare |
| Strobe tachometer (RPM meter) | 4.3 / 5 (83) | Free | Aug 26, 2026 | Compare |