Comparison

Watch Tuner 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

Watch Tuner

This application tests mechanical and automatic watches by measuring rate, beat error, and amplitude using your device's microphone. It provides a history of results for tracking watch quality and stability. For best accuracy, use in a quiet environment.

Highlights
  • Measures rate, beat error, and amplitude
  • Uses device microphone for recording ticks
  • Provides results history
  • Supports iPhone and iPod
  • Quiet environment recommended for accuracy
Features
Read full description

Watch Tuner is a mechanical and automatic watch testing application designed to measure following parameters: - rate - beat error - amplitude - beats per hour The application uses the build-in or headset microphone to record audible ticks of the watch. You can measure now with your iPhone the quality and stability of the rate accuracy, amplitude and beat error of mechanical watch movements. You can also take advantage of results history. Use in a quiet environment. Any ambient noises can affect result accuracy. Complete silence is the best. Recommended way to record the ticks is to touch the crown of the watch with the headset microphone. You will get the best results using original Apple EarPods. If you don't need such advanced tool as Watch Tuner and all you need is to the check rate accuracy, maybe it's worth to try Watch Tuner Lite - a little brother of Watch Tuner application. If you need frequency diagram look at Watch Tuner Timegrapher - the most sophisticated app of Watch Tuner series.

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

Watch Tuner1 screens
Twelve O'clock4 screens

Verdict

The call

The clearest difference is price: Twelve O'clock at Free against Watch Tuner's $0.99. Twelve O'clock also leads on rating (4.4 vs 3.8) and review sentiment (91% vs 70%). Watch Tuner's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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; Watch Tuner costs $0.99 up front. Twelve O'clock sells 1 one-off in-app purchase. Watch Tuner asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Twelve O'clock holds the better App Store score, 4.4 against 3.8. That said, the two scores are not equally well evidenced: Twelve O'clock has 83 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 70% of Watch Tuner's written reviews are positive against 91% of Twelve O'clock's.

UpkeepUpdate frequency

Watch Tuner ships an update every 2 months, Twelve O'clock every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
Watch Tuner versus Twelve O'clock: the parameters behind the verdict, then further details
ParameterWatch TunerTwelve O'clock
Price$0.99Free — better
Rating3.8 (6 ratings)4.4 (83 ratings) — better
Positive reviews69.6% of reviews91.1% of reviews — better
Number of ratings683 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.615.0 — better
Further details — not scored
Size1 MB46 MB
Age rating4+4+
DeveloperBartlomiej SwiatekHieu Pham

Customer experience

Watch Tuner

All ratings6 ratings
Positive50.0%
Neutral33.3%
Negative16.7%
Written reviews23 reviews
Positive69.6%
Neutral8.7%
Negative21.7%

Twelve O'clock

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

Bugs and requests

Watch Tuner

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

None

Watch Tuner

No in-app purchases

1 purchases

Twelve O'clock

One-time1
  • Twelve Plus$1.99

Questions

Is Watch Tuner free?
Watch Tuner 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, Watch Tuner or Twelve O'clock?
Twelve O'clock is rated higher. Watch Tuner averages 3.8 out of 5 from 6 ratings, while Twelve O'clock averages 4.4 from 83 ratings.
Do Watch Tuner or Twelve O'clock have ads?
Neither Watch Tuner nor Twelve O'clock shows ads.
Which is updated more often, Watch Tuner or Twelve O'clock?
Watch Tuner ships an update every 2 months, and Twelve O'clock every 3 weeks. Most recently, Watch Tuner was updated on November 1, 2026 and Twelve O'clock on November 3, 2026.

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