Timegrapher X vs Twelve O'clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Timegrapher X
This app analyzes the ticking sound of mechanical watches to measure accuracy, beat error, and amplitude. It offers real-time waveform and detailed diagram displays, as well as long-term data logging for in-depth analysis. Pro features include PDF reports, CSV export, and extended testing durations.
- Mechanical watch sound analysis
- Measures accuracy, beat error, amplitude
- Real-time waveform display
- Detailed diagram display
- Long-term data logger
- Save and share PDF reports (Pro)
- Export data as CSV (Pro)
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Timegrapher X analyzes the ticking sound of a mechanical watch to measure its accuracy rate, beat error, and amplitude. The app is specifically optimized to work with the Apple EarPods' headset microphone. Ideally, the headset microphone and the watch crown should be slightly pressed together, as this greatly improves the level of detail and diagram quality. The better the contact, the stronger the signal. https://timegrapher.app/ Timegrapher X consists of two separate modules (tabs): The "INSTANT" module shows how the watch is behaving in the short term, or "right now". It is very similar to a traditional timegrapher device, with the added benefits of a real-time waveform display and a high-detail diagram display. The "LONG TEST" module is a graphical data logger, which helps you observe the long-term behavior of a watch. Various chart indicators are available, such as average rate, moving rate history, rate drift over time, and more. Long-term measurements for up to 12 hours can be conducted for in-depth analysis of the watch being tested. Timegrapher X Pro (in-app upgrade) provides these additional features: • Save and share branded, printable PDF reports for each measurement • Export raw measurement data as a .csv file for spreadsheet analysis • Conduct long-term measurements for up to 120 hours For demo videos and documentation, please visit: https://timegrapher.app/
Twelve O'clock
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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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)
Screenshots
Verdict
The clearest difference is price: Twelve O'clock at Free against Timegrapher X's $29.99. Twelve O'clock also leads on review sentiment (91% vs 70%) and update cadence (every 3 weeks vs every 2 months). On rating, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Twelve O'clock is free to download; Timegrapher X costs $29.99 up front. Timegrapher X sells 1 one-off in-app purchase and Twelve O'clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Twelve O'clock holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 23 and 83 respectively. Written reviews point the same way: 70% of Timegrapher X's written reviews are positive against 91% of Twelve O'clock's.
Timegrapher X ships an update every 2 months, Twelve O'clock every 3 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.
| Parameter | Timegrapher X | Twelve O'clock |
|---|---|---|
| Price | $29.99 | Free — better |
| Rating | 4.2 (23 ratings) | 4.4 (83 ratings) — better |
| Positive reviews | 70.0% of reviews | 91.1% of reviews — better |
| Number of ratings | 23 | 83 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | ONYX Apps | Hieu Pham |
Customer experience
Timegrapher X
Twelve O'clock
Bugs and requests
Timegrapher X
Not enough reviews yet to summarise bugs or requests.
Twelve O'clock
Reported bugs
11 issues- 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
Show 6 moreShow fewer
- 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
Requested features
18 requests- 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
Show 13 moreShow fewer
- 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
In-app purchases
Timegrapher X
- Timegrapher X Pro$29.99
Twelve O'clock
- Twelve Plus$1.99
Questions
Is Timegrapher X free?
Is Twelve O'clock free?
Which has better reviews, Timegrapher X or Twelve O'clock?
Do Timegrapher X or Twelve O'clock have ads?
Which is updated more often, Timegrapher X or Twelve O'clock?
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