# Twelve O'clock — Track your watch accuracy

> Manual watch accuracy tracker and collection manager with horology content. (iPhone/iPad app by Hieu Pham.)

- Source: https://appshunter.io/ios/app/twelve-oclock/id1570977980 (this page in markdown: same URL + `.md`)
- Developer: [Hieu Pham](https://appshunter.io/developer/1570977982)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.40/5 from 82 App Store ratings · 123 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 45 MB
- Languages: American English
- Released: 2021-06-15
- Data updated: 2026-08-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/twelve-oclock/id1570977980/reviews.md

## What is Twelve O'clock?

Twelve O’clock is an app that helps track your watch accuracy easily in a realistic way.

I can’t stress this enough: it’s “tracking”, not measuring instantaneous accuracy like a timegrapher device.

It’s a manual and oldschool job but it brings so much fun. It reminds me of the old days when I had to synchronize my watch to the clock on the TV at 7pm every day.

With Twelve O'clock you can:

** MANAGE YOUR WATCH COLLECTION

* Add, edit, remove any item in a list of your watch collection
* Include a nice wristshot of each watch


** KNOW YOUR WATCH ACCURACY

* Simply add some checkpoints and let the app calculate the accuracy in *second per day*
* A nice chart of the accuracy over the time

** LEARN MORE ABOUT HOROLOGY

* Curated content for watch lovers (like me)

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## What do users think of Twelve O'clock?

Overall sentiment: positive

**Pros**

- 👍 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
- 🌙 Dark mode support
- 📱 Clean, modern design
- 🔧 No ads or subscriptions
- ⌚ Perfect for mechanical watch enthusiasts
- 📈 Tracks multiple watches easily
- 💾 Data export functionality
- 🎨 Aesthetically pleasing interface
- 👨‍💻 Developer actively maintains and updates app
- 📚 Curated watch articles included
- 🎥 Photo checkpoint feature

**Cons**

- 🐛 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
- 📱 Buttons too small (15/30/45 second marks)
- 🔄 No cloud sync or iCloud backup
- 📊 Graph display occasionally glitches
- 🔧 Insufficient user instructions
- ❌ Cannot edit individual checkpoints without deleting all
- ⏰ Removed real-time current time display in recent update
- 🌍 Limited language support

**Commonly 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
- Beeping only works when phone not in silent mode
- Sort function not working
- Screenshot sharing produces blank page
- Calculation errors showing ~150 second variance
- Checkpoint history doesn't display correctly
- Swiping left to delete checkpoints not intuitive

**Most 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
- Wear frequency tracking
- Average accuracy by watch position
- Widget support
- Atomic clock built into app
- Regulator clock layout for time setting
- In-app feedback option (instead of Twitter)
- Automatic time reading from watch photos
- 12-hour time format option
- Sort function improvements
- Year display in checkpoint history
- Chrono24 account integration
- Regular article updates
- Export to Excel/CSV

## Recent user reviews (10 of 123)

All indexed reviews: https://appshunter.io/ios/app/twelve-oclock/id1570977980/reviews.md

### 5/5 — Does the job

*2026-01-04, version 3.3.0*

Great for tracking mechanical watch accuracy and only a dollar to access all the features. Only suggestion for quality of life is the beeping sound mechanic for the 57, 58, 59, and 60 sec. It only works/ makes sound if the iPhone is not in silent mode (bell icon off).

### 5/5 — Great app!

*2025-12-31, version 3.3.0*

This app is a must-have for anyone with mechanical watches - love the watch accuracy tracking - the beeping on the reference clock is a gamechanger!

### 5/5 — Easy to use

*2025-12-27, version 3.3.0*

Simple. Does exactly what it claims, and makes it easy. One thing I do wish it had is notifications/reminders

### 5/5 — Nearly Perfect

*2025-12-19, version 3.3.0*

Very simple but effective. Only improvement could be a ‘current time’ button when you start tracking a watch to save time (rather than set then click to record current time). It’s free and doesn’t pester you with ads.

### 5/5 — Excellent App

*2025-12-11, version 3.3.0*

Wow, a very well designed app that only requires a very cheap 1 dollar payment for unlimited use. Very cool that it allows for measurement of time at not just the 0s mark but at the other 15s mark intervals too

### 5/5 — Must for Automatics

*2025-11-10, version 3.3.0*

This is a must for automatic movement enthusiasts. Very easy to use, the watch article compilation is a nice touch as well. Full app for only .99 one time purchase.

### 1/5 — Чушь

*2025-10-21*

Это приложение не оценивает точность часов, это приложение оценивает скорость реакции владельца и выманивает деньги.

**Developer response:** hey! If you don’t trust your shaking finger, use the Photo checkpoint feature instead. 
Speaking of money: am I swindlering your precious 1 dollar? Or 1 dollar is everything you have? I gave you 5 checkpoints for free. And you can delete them to test over again. Think before you write.

### 1/5 — Disappointing

*2025-10-14, version 3.3.0*

WARNING: Despite paying for premium, this app does not allow you to remove or edit checkpoints without deleting ALL of them, making it completely useless.

### 5/5 — Excellent

*2025-09-27, version 3.3.0*

La perfection pour la dérive quotidienne ! Remplace avec des améliorations toutes les app obsolètes. Tarif dérisoire. À recommander pour vérifier la précision simplement.

### 5/5 — Great app made by an enthusiast

*2025-09-25, version 3.3.0*

A simple app that does what its job well, with no annoying ads in the free version, and seems to be made by an hobbyist. I love it. My only gripe is the limited number of checkpoints in the free version, but I was happy to pay a dollar to upgrade.

## Frequently asked questions about Twelve O'clock

### What does Twelve O'clock do?

Twelve O'clock is an app designed for tracking the accuracy of your mechanical watches. It allows you to manually log checkpoints to calculate how many seconds your watch gains or loses per day. It also helps you manage your watch collection by letting you add, edit, and remove watches, complete with photos.

### How do I track my watch's accuracy?

To track your watch's accuracy, you add checkpoints within the app. By inputting these checkpoints, the app calculates the accuracy in seconds per day. You can then view a chart showing the accuracy trends over time, providing a realistic view of your watch's performance.

### Is Twelve O'clock free to use?

The app is free to download and use, with the option for in-app purchases. This means you can enjoy the core features of tracking your watch accuracy and managing your collection without initial cost, with additional features or content potentially available through purchases.

### What kind of watches can I track with this app?

This app is primarily for tracking the accuracy of mechanical watches. It's designed for a manual, old-school approach to monitoring timekeeping, similar to synchronizing a watch to a reference clock. It does not measure instantaneous accuracy like a timegrapher device.

### What other features does the app offer besides accuracy tracking?

Beyond tracking watch accuracy, the app allows you to build and manage a collection of your watches. You can add, edit, and remove items from your collection, and include a photograph for each watch. Additionally, it offers curated content for horology enthusiasts to learn more about watches.

## Version history (last 5 releases)

### 3.5.0 — 2026-06-11

- Additional view mode for Accuracy chart
- Pick a random watch

### 3.4.1 — 2026-01-16

Bug fixes and performance improvements

### 3.4.0 — 2026-01-15

- Repeated spinner wheel
- Improved animation performance

### 3.3.0 — 2025-09-08

- Fix an issue that reset the time format unexpectedly
- Improvements

### 3.2.2 — 2025-08-11

- Fix a bug that cause the chart showing wrong data

## Apps similar to Twelve O'clock

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Magnetized Wristwatch Checker](https://appshunter.io/ios/app/magnetized-wristwatch-checker/id6478119877) | 4.8 (18) | Free | Utilities |
| [Timegrapher - watch accuracy](https://appshunter.io/ios/app/timegrapher-watch-accuracy/id6450460771) | 2.8 (44) | Free | Utilities |
| [ChronoLog • Watch Accuracy](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510) | 4.7 (189) | Free | Utilities |
| [Clockwork - Watch App](https://appshunter.io/ios/app/clockwork-watch-app/id1612061033) | 4.3 (23) | Free | Utilities |
| [Watch Accuracy Checker](https://appshunter.io/ios/app/watch-accuracy-checker/id6478476307) | 2.0 (1) | Free | Utilities |
| [Tickoprint](https://appshunter.io/ios/app/tickoprint/id1496578178) | 1.3 (6) | Free | Utilities |

## More apps by Hieu Pham

- [Magnetick](https://appshunter.io/ios/app/magnetick/id6764266606)

All apps by Hieu Pham: https://appshunter.io/developer/1570977982

## Related topics

[twelve](https://appshunter.io/ios/topics/twelve) · [mechanical watch](https://appshunter.io/ios/topics/mechanical-watch) · [watch regulator](https://appshunter.io/ios/topics/watch-regulator) · [watch amplitude](https://appshunter.io/ios/topics/watch-amplitude) · [watch accuracy](https://appshunter.io/ios/topics/watch-accuracy) · [watch accuracy checker](https://appshunter.io/ios/topics/watch-accuracy-checker) · [watch accuracy meter](https://appshunter.io/ios/topics/watch-accuracy-meter) · [watch tracker](https://appshunter.io/ios/topics/watch-tracker)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-10.*