Comparison

Timegrapher X vs Twelve O'clock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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)
Features
Read full description

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/

About

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.

Highlights
  • Manage watch collection
  • Add/edit/remove watches
  • Include watch photos
  • Track watch accuracy
  • Calculate seconds per day
  • View accuracy charts
  • Horology content
Features
Read full description

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

Timegrapher X4 screens
Twelve O'clock4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Timegrapher X versus Twelve O'clock: the parameters behind the verdict, then further details
ParameterTimegrapher XTwelve O'clock
Price$29.99Free — better
Rating4.2 (23 ratings)4.4 (83 ratings) — better
Positive reviews70.0% of reviews91.1% of reviews — better
Number of ratings2383 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size7 MB46 MB
Age rating4+4+
DeveloperONYX AppsHieu Pham

Customer experience

Timegrapher X

All ratings23 ratings
Positive78.3%
Neutral4.3%
Negative17.4%
Written reviews30 reviews
Positive70.0%
Neutral6.7%
Negative23.3%

Twelve O'clock

All ratings82 ratings
Positive84.1%
Neutral1.2%
Negative14.6%
Written reviews123 reviews
Positive91.1%
Neutral0.8%
Negative8.1%

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 more
  • 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 more
  • 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

1 purchases

Timegrapher X

One-time1
  • Timegrapher X Pro$29.99
1 purchases

Twelve O'clock

One-time1
  • Twelve Plus$1.99

Questions

Is Timegrapher X free?
Timegrapher X costs $29.99, and also offers in-app purchases.
Is Twelve O'clock free?
Twelve O'clock is free to download, with in-app purchases available.
Which has better reviews, Timegrapher X or Twelve O'clock?
Twelve O'clock is rated higher. Timegrapher X averages 4.2 out of 5 from 23 ratings, while Twelve O'clock averages 4.4 from 83 ratings.
Do Timegrapher X or Twelve O'clock have ads?
Neither Timegrapher X nor Twelve O'clock shows ads.
Which is updated more often, Timegrapher X or Twelve O'clock?
Timegrapher X ships an update every 2 months, and Twelve O'clock every 3 weeks. Most recently, Timegrapher X was updated on November 7, 2026 and Twelve O'clock on November 3, 2026.

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