# Cuckoo Clock Calibration vs Twelve O'clock

The clearest difference is price: Twelve O'clock at Free against Cuckoo Clock Calibration's $0.99. Cuckoo Clock Calibration's advantage is rating (4.9 vs 4.4) and in-app purchases (none vs 1). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

Twelve O'clock is free to download; Cuckoo Clock Calibration costs $0.99 up front. Twelve O'clock sells 1 one-off in-app purchase. Cuckoo Clock Calibration asks for nothing beyond the download.

Cuckoo Clock Calibration holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 36 and 83 respectively. Written reviews complicate that: 86% of Cuckoo Clock Calibration's written reviews are positive against 91% of Twelve O'clock's, so the app with the better star average is not the one people write more warmly about.

Cuckoo Clock Calibration ships an update monthly, Twelve O'clock every 3 weeks. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Cuckoo Clock Calibration | Twelve O'clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.9 (36 ratings)](https://appshunter.io/ios/app/cuckoo-clock-calibration/id1171487289/reviews)** | [4.4 (83 ratings)](https://appshunter.io/ios/app/twelve-oclock/id1570977980/reviews) |
| Number of ratings | 36 | **83** |
| Positive reviews | 85.5% of reviews | **91.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 19 MB | 46 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nir Hamzani](https://appshunter.io/developer/1026666321) | [Hieu Pham](https://appshunter.io/developer/1570977982) |

## What reviewers say

### Cuckoo Clock Calibration

[App page](https://appshunter.io/ios/app/cuckoo-clock-calibration/id1171487289)

This app transforms your iPhone into a highly accurate sensor for calibrating cuckoo and pendulum clocks. It measures clock beats, calculates daily gain or loss, and guides you through precise adjustments for optimal timekeeping.

**Highlights:** Precise clock beat period measurement, Daily gain/loss calculation, Train count sensor with 1μs accuracy, Adjustable signal gain and detection threshold, Reference timing table with user-defined clocks, Waveform display for tick readings

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 💰 Affordable price
- ✅ Accurate readings
- ⏱️ Saves time
- 🛠️ Helps with clock repair

**What reviewers complain about**

- ❓ Confusing directions
- 📉 Inconsistent readings sometimes
- 🚫 External microphone issues
- 🎛️ Limited reference clocks
- 🗣️ Name not universal

**Reported bugs**

- App closes after setting reference
- App crashes on startup after reference beat memory use
- App crashes
- App crashes and requires reinstallation
- App crashes on iPhone 6s

**Requested features**

- Accurate beat frequency display
- Level indicator display
- External microphone support
- Plot period over time
- Allow reference periods over 1 second


### Twelve O'clock

[App page](https://appshunter.io/ios/app/twelve-oclock/id1570977980)

Easily track the accuracy of your mechanical watches over time. Manually log checkpoints to calculate seconds per day and visualize performance with charts. Manage your watch collection with photos and learn more about horology.

**Highlights:** Manage watch collection, Add/edit/remove watches, Include watch photos, Track watch accuracy, Calculate seconds per day, View accuracy charts, Horology content

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Twelve Plus | $1.99 | one-time |

**What reviewers like**

- 👍 Intuitive and simple user interface
- 💰 Excellent value at $0.99 one-time purchase
- 🎯 Accurate watch accuracy tracking
- ⏱️ Flexible checkpoint timing (0, 15, 30, 45 seconds)
- 📊 Clear data visualization and graphs

**What reviewers complain about**

- 🐛 App freezes and crashes frequently
- 💾 Data loss after updates
- ⚠️ Free version severely limited (5 checkpoints only)
- 🔔 Silent mode prevents beeping sounds
- 🎯 Requires learning curve for some users

**Reported bugs**

- App freezes at loading requiring phone restart
- Data deletion after app updates
- Data loss on app crash
- Graph display glitches after checkpoints
- Photo checkpoint feature returns 'old photo not supported' error

**Requested features**

- iCloud/cloud synchronization across devices
- Notifications or reminders for checkpoints
- Current time button on checkpoint screen
- Larger buttons for 15/30/45 second marks
- Power reserve tracking


## Frequently asked questions

### Is Cuckoo Clock Calibration free?

Cuckoo Clock Calibration costs $0.99, with no in-app purchases.

### Is Twelve O'clock free?

Twelve O'clock is free to download, with in-app purchases available.

### Which has better reviews, Cuckoo Clock Calibration or Twelve O'clock?

Cuckoo Clock Calibration is rated higher. Cuckoo Clock Calibration averages 4.9 out of 5 from 36 ratings, while Twelve O'clock averages 4.4 from 83 ratings.

### Do Cuckoo Clock Calibration or Twelve O'clock have ads?

Neither Cuckoo Clock Calibration nor Twelve O'clock shows ads.

### Which is updated more often, Cuckoo Clock Calibration or Twelve O'clock?

Cuckoo Clock Calibration ships an update monthly, and Twelve O'clock every 3 weeks. Most recently, Cuckoo Clock Calibration was updated on October 29, 2026 and Twelve O'clock on October 24, 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.*