RTPListen vs Acoustic Tachometer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RTPListen
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If you are not a developer debugging RTP audio, this app probably isn't for you. Specify a multicast address if you want to listen to a multicast RTP session. Specify an allowed sender if you want to filter inbound packets by sender IP address.
Acoustic Tachometer
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: RTPListen at none against Acoustic Tachometer's 1. RTPListen also leads on update cadence (daily vs fortnightly) and iOS requirement (18.1 vs 26.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Acoustic Tachometer sells 1 one-off in-app purchase. RTPListen asks for nothing beyond the download.
RTPListen ships an update daily, Acoustic Tachometer fortnightly. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.
| Parameter | RTPListen | Acoustic Tachometer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.1 — better | 26.0 |
| Further details — not scored | ||
| Size | 1 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Peter Whiting | Jan Sokol |
In-app purchases
RTPListen
No in-app purchases
Acoustic Tachometer
- Acoustic Tachometer Pro$5.99
Questions
Is RTPListen free?
Is Acoustic Tachometer free?
Do RTPListen or Acoustic Tachometer have ads?
Which is updated more often, RTPListen or Acoustic Tachometer?
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