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Twelve O'clock

Twelve O'clock

Track your watch accuracy

80 ratings
123 reviews
🔧 Utilities
🌟 Lifestyle
Free
In-App Purchases

Details

  • Released
  • Updated
  • June 15, 2021
  • June 11, 2026

Developer

Hieu Pham
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Twelve O'clock screenshot #1 for iPhone
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Twelve O'clock screenshot #5 for iPhone
iphone
ipad
🧾$1.99
In-App Purchase↘︎
📌Ready
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About

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.

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

Summarized from real user reviews of Twelve O'clock. Based on 80 reviews and a 4.4/5 average, it highlights the 15 positives and 12 negatives reviewers mention most about this Utilities app.

Positive things

  • 👍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

Negative things

  • 🐛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
See all reviews

What's New in Twelve O'clock

3.5.0

June 11, 2026

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

1

In-App Purchases

$1.99

Twelve Plus

Unlimited watches and checkpoints

User reviews

Most RecentHighest RatedLowest Rated

Does the job

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).
dacheu04dacheu04

Great app!

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!
DravieDravie

Easy to use

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

Nearly Perfect

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.
Alexbland89Alexbland89

Excellent App

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
hawk9598hawk9598
See 118 more reviews

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User experience

🐞

Reported Bugs

11 issues

App freezes at loading requiring phone restart

Bug

Data deletion after app updates

Bug

Data loss on app crash

Bug

Graph display glitches after checkpoints

Bug

Photo checkpoint feature returns 'old photo not supported' error

Bug

Beeping only works when phone not in silent mode

Bug

Sort function not working

Bug

Screenshot sharing produces blank page

Bug

Calculation errors showing ~150 second variance

Bug

Checkpoint history doesn't display correctly

Bug

Swiping left to delete checkpoints not intuitive

Bug
✨

Requested Features

18 requests

iCloud/cloud synchronization across devices

Feature

Notifications or reminders for checkpoints

Feature

Current time button on checkpoint screen

Feature

Larger buttons for 15/30/45 second marks

Feature

Power reserve tracking

Feature

Wear frequency tracking

Feature

Average accuracy by watch position

Feature

Widget support

Feature

Atomic clock built into app

Feature

Regulator clock layout for time setting

Feature

In-app feedback option (instead of Twitter)

Feature

Automatic time reading from watch photos

Feature

12-hour time format option

Feature

Sort function improvements

Feature

Year display in checkpoint history

Feature

Chrono24 account integration

Feature

Regular article updates

Feature

Export to Excel/CSV

Feature

FAQ

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.