# Kello vs Davey Heat Pump

The clearest difference is review sentiment: Davey Heat Pump at 100% against Kello's 37%. Davey Heat Pump also leads on price (Free vs $9.99) and iOS requirement (11.0 vs 13.0). Kello's advantage is update cadence (every 3 months vs every 26 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Davey Heat Pump is free to download; Kello costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kello ships an update every 3 months, Davey Heat Pump every 26 months. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Kello | Davey Heat Pump |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[2.8 (5 ratings)](https://appshunter.io/ios/app/kello/id380539253/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 37.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 26 months |
| Monetization | Free | Free |
| Size | 4 MB | 184 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coldflower Design Corp.](https://appshunter.io/developer/380539256) | [Davey](https://appshunter.io/developer/1411704812) |

## 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


### Davey Heat Pump

[App page](https://appshunter.io/ios/app/davey-heat-pump/id1538423342)

Control and schedule your Davey heat pump remotely via Wi-Fi. Manage its operation and settings from your iPhone or iPod.

**Highlights:** Remote operation management, Scheduling capabilities, Wi-Fi connectivity, Device control

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kello free?

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

### Is Davey Heat Pump free?

Davey Heat Pump is free to download, with no in-app purchases.

### Do Kello or Davey Heat Pump have ads?

Neither Kello nor Davey Heat Pump shows ads.

### Which is updated more often, Kello or Davey Heat Pump?

Kello ships an update every 3 months, and Davey Heat Pump every 26 months. Most recently, Kello was updated on October 23, 2026 and Davey Heat Pump on October 14, 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.*