# Kello vs Watch Tuner

The clearest difference is rating: Watch Tuner at 3.8 against Kello's 2.8. Watch Tuner also leads on review sentiment (70% vs 37%) and price ($3.99 vs $9.99). Kello's advantage is iOS requirement (13.0 vs 15.6). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Kello costs $9.99 and Watch Tuner $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Watch Tuner holds the better App Store score, 3.8 against 2.8. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews point the same way: 37% of Kello's written reviews are positive against 70% of Watch Tuner's.

Kello ships an update every 3 months, Watch Tuner every 2 months. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Kello | Watch Tuner |
| --- | --- | --- |
| Price | $9.99 | **$3.99** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/kello/id380539253/reviews) | **[3.8 (6 ratings)](https://appshunter.io/ios/app/watch-tuner/id959394022/reviews)** |
| Number of ratings | 5 | **6** |
| Positive reviews | 37.3% of reviews | **69.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 4 MB | 1 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coldflower Design Corp.](https://appshunter.io/developer/380539256) | [Bartlomiej Swiatek](https://appshunter.io/developer/943509577) |

## What reviewers say

### Kello

[App page](https://appshunter.io/ios/app/kello/id380539253)

This app analyzes the accuracy of mechanical watches by listening to their ticking sounds through your device's microphone. It compares the watch's rhythm to the precise system clock to reveal timekeeping differences. Supports a wide range of watch frequencies and offers guidance on identifying mechanical timepieces.

**Highlights:** Microphone-based watch sound analysis, Comparison to iOS system clock, Automatic detection of 8 common watch frequencies, Guidance on identifying mechanical watches, Displays timekeeping differences

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative watch timing solution at affordable price
- ✅ Accurate readings when properly configured
- 🎯 Correctly identifies beat frequency (BPH)
- ⚙️ Useful for watch regulation and adjustment
- 📱 Portable alternative to expensive timing machines

**What reviewers complain about**

- 🎙️ Highly sensitive to microphone quality and placement
- 🔇 Requires extremely quiet environment to function
- 📊 Inconsistent readings even in same position
- ⚠️ Frequent signal detection failures
- 🔄 High variability in results between measurements

**Reported bugs**

- App crashes on iPhone 5 and iOS 6
- Signal detection fails inconsistently
- Frequency auto-detection varies wildly on same watch
- Unstable signal readings despite strong initial signal
- App hangs on 'determine frequency' step

**Requested features**

- History log and data storage for watches
- Graphical representation of timing data over time
- Average readings over longer time periods
- Watch profile saving functionality
- Beat error measurement capability


### Watch Tuner

[App page](https://appshunter.io/ios/app/watch-tuner/id959394022)

This application tests mechanical and automatic watches by measuring rate, beat error, and amplitude using your device's microphone. It provides a history of results for tracking watch quality and stability. For best accuracy, use in a quiet environment.

**Highlights:** Measures rate, beat error, and amplitude, Uses device microphone for recording ticks, Provides results history, Supports iPhone and iPod, Quiet environment recommended for accuracy

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Kello free?

Kello costs $9.99, with no in-app purchases.

### Is Watch Tuner free?

Watch Tuner costs $3.99, with no in-app purchases.

### Which has better reviews, Kello or Watch Tuner?

Watch Tuner is rated higher. Kello averages 2.8 out of 5 from 5 ratings, while Watch Tuner averages 3.8 from 6 ratings.

### Do Kello or Watch Tuner have ads?

Neither Kello nor Watch Tuner shows ads.

### Which is updated more often, Kello or Watch Tuner?

Kello ships an update every 3 months, and Watch Tuner every 2 months. Most recently, Kello was updated on October 14, 2026 and Watch Tuner on October 12, 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.*