TI vs Twelve O'clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TI
This utility app displays the current time in various unconventional formats, including decimal, hexadecimal, and Swatch Internet time. It's designed for users who appreciate unique and challenging ways to view time, with some formats requiring specialized knowledge to interpret.
- Decimal time display
- Hexadecimal time display
- Swatch Internet time
- Trigonometry clock
- PT clock
- Large, easy-to-read digits
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This clock App is meant for all those users who like to get the time in unusual or challenging ways. This App can display the time in many different ways, like for example as decimal time (which was introduced in the French Revolution), as hexedecimal time (the idea goes back to the 19th century), as "Swatch Internet time" and many others. The most challenging clocks are the trigonometry clock and the PT clock, which requires some mathematical or chemical knowledge to interpret the time correctly. This clock is for "Geeks" ;-) The App shows the time in big letters which are easy to read even from the distance. So you can use an (old) iOS device put it on a shelf so it just shows the time. Feel free to make suggestions for other "geeky" clocks I can add in the future...
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 TI's $0.99. Twelve O'clock also leads on rating (4.4 vs 3.8) and update cadence (every 3 weeks vs every 8 months). TI's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 14.0). On ads and device support 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; TI costs $0.99 up front. Twelve O'clock sells 1 one-off in-app purchase. TI asks for nothing beyond the download.
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 82 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 73% of TI's written reviews are positive against 91% of Twelve O'clock's.
TI ships an update every 8 months, Twelve O'clock every 3 weeks. The most recent releases landed on August 23, 2026 and August 10, 2026 respectively.
| Parameter | TI | Twelve O'clock |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.8 (8 ratings) | 4.4 (82 ratings) — better |
| Positive reviews | 73.3% of reviews | 91.1% of reviews — better |
| Number of ratings | 8 | 82 — better |
| Update frequency | Every 8 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 2 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexander Clauss | Hieu Pham |
Customer experience
TI
Twelve O'clock
Bugs and requests
TI
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
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- 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
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- 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
TI
No in-app purchases
Twelve O'clock
- Twelve Plus$1.99
