# Kello vs Watch Tuner Timegrapher

The clearest difference is rating: Watch Tuner Timegrapher at 3.8 against Kello's 2.8. Watch Tuner Timegrapher also leads on price ($1.99 vs $9.99) and review sentiment (68% vs 37%). Kello's advantage is iOS requirement (13.0 vs 15.6). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Kello costs $9.99 and Watch Tuner Timegrapher $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Watch Tuner Timegrapher holds the better App Store score, 3.8 against 2.8. That said, the two scores are not equally well evidenced: Watch Tuner Timegrapher has 80 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 37% of Kello's written reviews are positive against 68% of Watch Tuner Timegrapher's.

Kello ships an update every 3 months, Watch Tuner Timegrapher every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Kello | Watch Tuner Timegrapher |
| --- | --- | --- |
| Price | $9.99 | **$1.99** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/kello/id380539253/reviews) | **[3.8 (80 ratings)](https://appshunter.io/ios/app/watch-tuner-timegrapher/id991367080/reviews)** |
| Number of ratings | 5 | **80** |
| Positive reviews | 37.3% of reviews | **68.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 4 MB | 2 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, 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 Timegrapher

[App page](https://appshunter.io/ios/app/watch-tuner-timegrapher/id991367080)

This application analyzes the performance of mechanical watches by using your device's microphone to record ticking sounds. It generates a frequency diagram and provides measurements for rate, beat error, amplitude, and beats per hour.

**Highlights:** Frequency diagram display, Measures rate accuracy, Measures beat error, Measures amplitude, Measures beats per hour (BPH), Uses device microphone

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 💰 Affordable alternative to expensive professional timegraphers
- 📊 Accurate measurements when used correctly with proper microphone setup
- 🎯 Precise beat error and amplitude detection capabilities
- ⚙️ Highly adjustable settings for different watch movements
- 📈 Clear, easy-to-read graphical display of results

**What reviewers complain about**

- 🎤 Highly dependent on microphone quality and placement
- 🔇 Requires completely silent environment to function properly
- ⚠️ Inconsistent readings across different devices and setups
- 😤 Steep learning curve with many trial-and-error adjustments needed
- 🚫 Fails to detect watch ticks in noisy environments

**Reported bugs**

- App crashes on certain iOS versions (iPhone X with iOS 14.6)
- Incompatible with older devices (iPod Touch 6, iOS 8.4)
- Blank white screen on some devices
- Quality reporting inconsistency between live reading and saved history
- Cannot store more than 16 history files (save button grays out)

**Requested features**

- Audio monitoring function to optimize microphone placement before measuring
- Audible ticking sound output (like professional models)
- Extended beat rate range to include mechanical clocks
- Only request microphone permissions when actually measuring
- History feature to save and track measurements over time


## Frequently asked questions

### Is Kello free?

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

### Is Watch Tuner Timegrapher free?

Watch Tuner Timegrapher costs $1.99, with no in-app purchases.

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

Watch Tuner Timegrapher is rated higher. Kello averages 2.8 out of 5 from 5 ratings, while Watch Tuner Timegrapher averages 3.8 from 80 ratings.

### Do Kello or Watch Tuner Timegrapher have ads?

Neither Kello nor Watch Tuner Timegrapher shows ads.

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

Kello ships an update every 3 months, and Watch Tuner Timegrapher every 4 months. Most recently, Kello was updated on November 1, 2026 and Watch Tuner Timegrapher on November 1, 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.*