# API MeasurePro vs SoundTach

The clearest difference is in-app purchases: API MeasurePro at none against SoundTach's 1. API MeasurePro also leads on iOS requirement (13.0 vs 15.0). SoundTach's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. SoundTach sells 1 one-off in-app purchase. API MeasurePro asks for nothing beyond the download.

API MeasurePro ships an update every 3 months, SoundTach every 2 weeks. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | API MeasurePro | SoundTach |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (5 ratings)](https://appshunter.io/ios/app/soundtach/id6755052370/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 20 MB | 51 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Automated Precision Inc.](https://appshunter.io/developer/1846172575) | [XCARAB INC](https://appshunter.io/developer/1724974508) |

## What reviewers say

### API MeasurePro

[App page](https://appshunter.io/ios/app/api-measurepro/id6754576227)

**In-app purchases:** none


### SoundTach

[App page](https://appshunter.io/ios/app/soundtach/id6755052370)

Measure engine RPM from sound without any tools. Simply point your phone at the exhaust of various engines like motorcycles, cars, or lawn mowers to get accurate, real-time readings. The app automatically filters background noise and indicates signal quality for reliable measurements.

**Highlights:** Automatic RPM detection from sound, Supports 2-stroke and 4-stroke engines, No manual configuration required, Real-time RPM display, Signal quality indicator, Professional and easy-to-read interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access - Pay Once | $4.99 | one-time |


## Frequently asked questions

### Is API MeasurePro free?

API MeasurePro is free to download, with no in-app purchases.

### Is SoundTach free?

SoundTach is free to download, with in-app purchases available.

### Do API MeasurePro or SoundTach have ads?

Neither API MeasurePro nor SoundTach shows ads.

### Which is updated more often, API MeasurePro or SoundTach?

API MeasurePro ships an update every 3 months, and SoundTach every 2 weeks. Most recently, API MeasurePro was updated on October 16, 2026 and SoundTach on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*