SoundRPM: Engine Tachometer
by 春城 贾
· Utilities
· Free
On the App Store since July 2026
· Data updated
SoundRPM: Engine Tachometer is made and published by 春城 贾. AppBrain is an independent app data site and isn't affiliated with 春城 贾. The app name, icon, screenshots and description belong to 春城 贾 and are shown as published on the App Store.
AppBrain's verdict
- Rating on App Store
- 3.00
- 2 ratings
- Last updated
- October 3, 2026
It doesn't have enough ratings yet to judge what users think.
Rankings
App Store top chartsApp Store Rankings for SoundRPM: Engine Tachometer
This app is not ranked
Competitors
Similar apps and more from 春城 贾Alternatives to SoundRPM: Engine Tachometer
More from 春城 贾
Releases
Updates seen on the App Store- Version
- 2.0
- Launched
- July 2026
No changelog data
User feedback
Ratings and reviews on the App StoreComments on SoundRPM: Engine Tachometer for iOS
We don't have enough comments to show example comments. Please check back later.
Technology
Found in the app by AppBrain- Price
- Free
- App size
- 9.14 MB
- Content rating
- Everyone
Technologies used by SoundRPM: Engine Tachometer
About the app and developer
About SoundRPM: Engine Tachometer
SoundRPM: Engine Tachometer is an utilities app developed by 春城 贾.
User Ratings
SoundRPM: Engine Tachometer is rated 3.00 out of 5 stars. The rating is based on 2 ratings.
App Information
SoundRPM: Engine Tachometer is freely available from the App Store. The app size is 9.14 MB. The latest version available is 2.0. The last update was on October 3, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since July 2026.
Developer information for 春城 贾
Address:
Store listing
By 春城 贾, from the App Store
Screenshots by 春城 贾, from the the App Store listing
Description by 春城 贾 Written by the developer, not by AppBrain. Click to read.
SoundRPM helps you estimate engine RPM using your iPhone microphone.
No wires. No OBD. No extra hardware.
Whether you are checking idle speed on a classic car, tuning a motorcycle, or working with a lawn mower, generator, chainsaw, or small engine, SoundRPM gives you a quick RPM estimate based on engine sound.
How it works:
1. Choose your engine type
2. Set cylinders and stroke type
3. Select your expected RPM range
4. Hold your iPhone near the engine or exhaust
5. Start listening and view the estimated RPM
Key features:
• Estimate engine RPM from sound
• Built for classic cars, motorcycles, and small engines
• Supports 2-stroke and 4-stroke configurations
• Choose cylinder count and RPM range
• Real-time RPM display
• Confidence level for every reading
• Stability indicator for idle checks
• Audio quality feedback
• Save measurement history
• No account required
• Audio is processed on your device
Use SoundRPM for:
• Classic car idle checks
• Motorcycle idle tuning
• Lawn mower RPM estimates
• Generator speed checks
• Chainsaw and small engine tuning
• DIY garage maintenance
• Before-and-after adjustment comparisons
SoundRPM is designed for stationary engine checks. Results may be affected by background noise, phone position, exhaust sound, engine configuration, and unstable throttle input.
Important safety note:
Do not use this app while driving. Keep your iPhone away from hot surfaces, belts, fans, pulleys, and other moving parts. SoundRPM provides estimated RPM readings only and is not a replacement for a professional tachometer or diagnostic tool.
Optional Lifetime Access is available in the app to unlock unlimited measurements and saved history.
What’s New:
Initial release of SoundRPM.
Estimate engine RPM from sound, choose engine presets, view confidence and stability, and save measurement history.
1. This service is a subscription based paid service, which means you will prepay for future subscription usage. You can currently choose to use this service on a quarterly basis. At the end of each subscription period, your subscription will automatically renew by default, unless you cancel the automatic renewal yourself or we cancel the service.
2. Unsubscribe: To cancel the renewal, please cancel at least 24 hours in advance. You can unsubscribe by opening System Settings, clicking on Apple ID, clicking on Subscription, selecting Premium, and then unsubscribing.
3. Restore purchase: If you receive a prompt saying "You have already subscribed to this project" during the payment process and confirm that you have completed the purchase before, you can click "Restore Purchase" in the upper right corner to restore the purchase.
Membership Service Agreement and Automatic Renewal Agreement:
https://gcn1s2rmayw3.feishu.cn/wiki/YgqKwPdJmiH0ulkF92kco1CznCg?from=from_copylink
Privacy Policy:
https://gcn1s2rmayw3.feishu.cn/wiki/SGBIwmUWCiPWoWktE5sclLRgnol?from=from_copylink
No wires. No OBD. No extra hardware.
Whether you are checking idle speed on a classic car, tuning a motorcycle, or working with a lawn mower, generator, chainsaw, or small engine, SoundRPM gives you a quick RPM estimate based on engine sound.
How it works:
1. Choose your engine type
2. Set cylinders and stroke type
3. Select your expected RPM range
4. Hold your iPhone near the engine or exhaust
5. Start listening and view the estimated RPM
Key features:
• Estimate engine RPM from sound
• Built for classic cars, motorcycles, and small engines
• Supports 2-stroke and 4-stroke configurations
• Choose cylinder count and RPM range
• Real-time RPM display
• Confidence level for every reading
• Stability indicator for idle checks
• Audio quality feedback
• Save measurement history
• No account required
• Audio is processed on your device
Use SoundRPM for:
• Classic car idle checks
• Motorcycle idle tuning
• Lawn mower RPM estimates
• Generator speed checks
• Chainsaw and small engine tuning
• DIY garage maintenance
• Before-and-after adjustment comparisons
SoundRPM is designed for stationary engine checks. Results may be affected by background noise, phone position, exhaust sound, engine configuration, and unstable throttle input.
Important safety note:
Do not use this app while driving. Keep your iPhone away from hot surfaces, belts, fans, pulleys, and other moving parts. SoundRPM provides estimated RPM readings only and is not a replacement for a professional tachometer or diagnostic tool.
Optional Lifetime Access is available in the app to unlock unlimited measurements and saved history.
What’s New:
Initial release of SoundRPM.
Estimate engine RPM from sound, choose engine presets, view confidence and stability, and save measurement history.
1. This service is a subscription based paid service, which means you will prepay for future subscription usage. You can currently choose to use this service on a quarterly basis. At the end of each subscription period, your subscription will automatically renew by default, unless you cancel the automatic renewal yourself or we cancel the service.
2. Unsubscribe: To cancel the renewal, please cancel at least 24 hours in advance. You can unsubscribe by opening System Settings, clicking on Apple ID, clicking on Subscription, selecting Premium, and then unsubscribing.
3. Restore purchase: If you receive a prompt saying "You have already subscribed to this project" during the payment process and confirm that you have completed the purchase before, you can click "Restore Purchase" in the upper right corner to restore the purchase.
Membership Service Agreement and Automatic Renewal Agreement:
https://gcn1s2rmayw3.feishu.cn/wiki/YgqKwPdJmiH0ulkF92kco1CznCg?from=from_copylink
Privacy Policy:
https://gcn1s2rmayw3.feishu.cn/wiki/SGBIwmUWCiPWoWktE5sclLRgnol?from=from_copylink