Acoustic Tachometer is an engine speed estimation utility for automotive hobbyists that uses iPhone microphone input to calculate RPM.
The App DNA
What makes this app unique?
Users report: The tool removes the need for physical contact tachometers, allowing users to capture repeatable engine measurements without attaching hardware.
For Automotive enthusiasts, mechanics, and hobbyists requiring quick, non-invasive engine speed checks.
What does it look like?
Key features
Calculates engine speed by analyzing firing frequency through the iPhone microphone.
Displays lock state and harmonic support to ensure measurement reliability.
Saves history on-device without cloud syncing or account requirements.
How much does it cost?
The app operates as a free, privacy-focused utility with no visible monetization, serving as a brand-building tool for the developer's broader product portfolio.
Velocity
Maintenance developmentUX improvementsShow more...
Acoustic Tachometer maintains a low-frequency release cadence, shipping approximately one update every 32 days. Development is currently focused on minor dashboard refinements rather than significant feature expansion. The project shows no evidence of live-ops or seasonal content, remaining in a stable maintenance phase. Future updates are expected to continue at this slow, incremental pace.
Who built it?
Jan Sokol
4 apps tracked · Utilities
Tempochron: Watch Timegrapher
Engine Lab: Simulator & Sound
Kinemetron: Film Camera TimingUser Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for Acoustic Tachometer
How's the Utilities market?
Acoustic Tachometer maintains a privacy-first position in the Utilities category, serving as a free, no-account tool. The lack of monetization signals its role as a brand-building asset for the Cognerva suite rather than a primary revenue driver.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for Acoustic Tachometer
Where is it heading?
Acoustic Tachometer will likely remain a stable, niche utility within the Cognerva suite, as its privacy-first, no-account model limits monetization potential. The PM should focus on maintaining signal accuracy to ensure the tool remains a reliable brand-building asset for the broader developer portfolio.
- The app maintains a maintenance-only update cadence, signaling it is a stable, finished utility rather than a growth-focused product.
The SWOT
- Local-first storage removes account-creation friction
- Confidence readouts provide measurement transparency
- Signal processing establishes technical authority
- Exportable CSV logs would increase tuning utility
- EV motor profiles could capture new segments
Next best moves
Ship CSV export functionality because users need to track tuning progress over time → increase utility for power users
The counter-intuitive read
The app's lack of cloud synchronization is a feature, not a bug…
Read the full takeBottom line
Acoustic Tachometer effectively serves as a privacy-focused brand asset for the Cognerva suite, and adding data export would unlock deeper utility for power users without compromising the local-first model.
Unlock 2 critical frictions, 1 market threat and the analyst’s take.
Access the full report for freeFAQ
Is Acoustic Tachometer safe to use for engine tuning?
Does Acoustic Tachometer require an account to save measurements?
What types of engines does Acoustic Tachometer support?
Sources
- [1] App Store, source
Report last updated