OCEANUS Connected vs Twelve O'clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OCEANUS Connected
This app connects your Bluetooth-enabled CASIO watch to your iPhone, enabling various Mobile Link functions. It simplifies watch operations and allows data transfer to the new CASIO WATCHES app. Requires iOS 14 or later and 'Always' location service permission.
- Bluetooth watch connectivity
- Mobile Link functions
- Simplified watch operations
- User data transfer
- Location services for time accuracy
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Important - Please Read Request to Transfer to the CASIO WATCHES App (Support Termination Notification) The functionality of this app will be transferred to the new watch app, CASIO WATCHES. By updating to version 3.0, users of this app will be able to transfer their user data to CASIO WATCHES via this app. While we understand this may be inconvenient for some users, we ask that you transfer your data across, and continue using CASIO WATCHES in place of this app. ●Description This is the basic application for connecting and communicating with a Bluetooth(R) v4.0 enabled CASIO watch. Pairing your watch with an iPhone enables use of a variety of different Mobile Link functions that greatly enhance the iPhone experience. The OCEANUS Connected app also simplifies certain watch operations by letting you perform them on your phone screen. Visit the website below for details. http://www.casio-watches.com/oceanus/ We recommend using OCEANUS Connected on the following operating systems. Operation is not guaranteed for any operating system not listed below. Even if an operating system has been confirmed as compatible, software updates or display specifications may prevent proper display and/or operation. ⋅ iOS 14 or later. Applicable Watches: OCW-G2000, OCW-S4000, OCW-T3000, OCW-T200, OCW-S5000, OCW-P2000, OCW-T4000 *Some watches unavailable in your region may be displayed in the application. This application uses location information to obtain accurate time. For "Location Service" in iPhone privacy settings, please "Always". If it is not "Always", the application will not work properly. Continued use of GPS running in the background can dramatically decrease battery life.
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 review sentiment: Twelve O'clock at 91% against OCEANUS Connected's 44%. Twelve O'clock also leads on update cadence (every 3 weeks vs every 2 months). OCEANUS Connected's advantage is in-app purchases (none vs 1) and rating (4.6 vs 4.4). On price, ratings volume, 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
Both are free to download. Twelve O'clock sells 1 one-off in-app purchase. OCEANUS Connected asks for nothing beyond the download.
OCEANUS Connected holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 119 and 82 respectively. Written reviews complicate that: 44% of OCEANUS Connected's written reviews are positive against 91% of Twelve O'clock's, so the app with the better star average is not the one people write more warmly about.
OCEANUS Connected ships an update every 2 months, Twelve O'clock every 3 weeks. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.
| Parameter | OCEANUS Connected | Twelve O'clock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (119 ratings) — better | 4.4 (82 ratings) |
| Positive reviews | 44.4% of reviews | 91.1% of reviews — better |
| Number of ratings | 119 — better | 82 |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 222 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | CASIO COMPUTER CO., LTD. | Hieu Pham |
Customer experience
OCEANUS Connected
Twelve O'clock
Bugs and requests
OCEANUS Connected
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
OCEANUS Connected
No in-app purchases
Twelve O'clock
- Twelve Plus$1.99
Questions
Is OCEANUS Connected free?
Is Twelve O'clock free?
Which has better reviews, OCEANUS Connected or Twelve O'clock?
Do OCEANUS Connected or Twelve O'clock have ads?
Which is updated more often, OCEANUS Connected or Twelve O'clock?
Other comparisons
