# Acoustic Tachometer — RPM from engine sound

> RPM from engine sound (iPhone/iPad app by Jan Sokol.)

- Source: https://appshunter.io/ios/app/acoustic-tachometer/id6789524641 (this page in markdown: same URL + `.md`)
- Developer: [Jan Sokol](https://appshunter.io/developer/1896490456)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-07-31
- Data updated: 2026-08-11
- User reviews in markdown: https://appshunter.io/ios/app/acoustic-tachometer/id6789524641/reviews.md

## What is 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.


## Version history (last 2 releases)

### 1.1 — 2026-08-11

Improved main dashboard

### 1.0 — 2026-07-31

No release notes.

## More apps by Jan Sokol

- [Tempochron: Watch Timegrapher](https://appshunter.io/ios/app/tempochron-watch-timegrapher/id6767587425)
- [Lulliq: Baby Monitor](https://appshunter.io/ios/app/lulliq-baby-monitor/id6768361730)
- [WaxTap](https://appshunter.io/ios/app/waxtap/id6770549285)
- [MotorQue: Car Dashboard & Scan](https://appshunter.io/ios/app/motorque-car-dashboard-and-scan/id6770917054)
- [Flicker Safe: Test Light](https://appshunter.io/ios/app/flicker-safe-test-light/id6771406035)

All apps by Jan Sokol: https://appshunter.io/developer/1896490456

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*