Merlin
· v1.5.1
About
*ATTENTION*: The Merlin watch face is designed for people who experience sleep disorders (Non24-hr). If you do not need these features, use the Merlin24 watch face instead.
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The Merlin watch face converts the standard 24-hr clock into a custom Non24-hr clock for people who experience Non-24-Hour Sleep-Wake Disorder with a consistent delay. It is also useful if you have a friend or family member with the disorder, or if you want a Non24-hr schedule for work or other reasons.
The screen shows a primary clock at the center and up to two other clocks at the bottom and top right corner. For each clock, the user can choose which type of time is displayed:
1. The Regular 24-hr Clock shows common time.
2. The Regular Non24-hr Clock follows a circadian rhythm entered by the user, displayed only in Non24 format (no AM/PM). The date follows common time.
3. The Converted Non24-hr Clock is like a time zone conversion. It maintains a 24-hr format, and the duration of hours and minutes is based on the circadian rhythm. It translates morning and evening so others can understand. For example, at 1:00 PM common time, the Non24 user could be at 3:00 AM, when most others would be sleeping. The date follows Non24 time; after the clock is offset by more than 24 hours, it will skip or repeat 1 calendar day to maintain a similar date as common time.
The Sync Date and Time is a reference point for common time, representing either the beginning of a Non24 day (00:00) or when the Converted Non24 Clock is in sync with common time.
Note: The seconds value for the Converted Non24 Clock will periodically stay constant or skip 1 or 2 seconds because the refresh rate is not in sync with Non24 seconds.
Additional features are also available. For more details, see the Merlin24 app.
A calculator spreadsheet is also available for additional Non24 resources: https://drive.google.com/drive/folders/1EKqGl49SUkPksOt8zV9Tw2vHSaOKsNES?usp=share_link
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Free trial: 24 hours
One-Time Purchase: 1.99 USD with currency conversion for any country
Payment: PayPal, ApplePay, Credit Card, accepted through the KiezelPay website
Install for free to see if you like it! The free trial will start automatically. After 24 hours, the watch screen will display a code and web link for payment. If you are unable to submit your payment, please click "Contact Developer". If you receive another code after purchasing, you can unlock your existing purchase.
Don’t see your device? Check the MerlinLegacy app.
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If you like the app, please leave a review! I appreciate your support :)
For questions and feedback, please click "Contact Developer”.
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General Settings (depends on device compatibility):
- Color of background, hours, minutes, and heart rate icon
- Format of time, date, and temperature
- Data field selection
- Steps bar display and color
- Leading zero (01:00 or 1:00)
- Battery % for yellow and red status
Non-24 Settings (for all devices):
- Clock type (see descriptions above)
- Custom Non24-hr circadian rhythm
- Sync time and date
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How to configure settings: https://apps.garmin.com/settingsHelp
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The app name was inspired by the merlin falcon.
The original app layout was modeled after the CleanSteps watch face by jonasbc.
What's new
v1.5.1, November 30, 2025
- Added new devices.
- Consolidated date format into one setting for ease of use. You may need to change it to your desired setting.
- Removed Heart Rate Refresh setting. The refresh rate now defaults to Always for compatible devices.
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v1.5.0, February 9, 2025:
- Added third type of clock, Regular Non24-hr, which shows non-adjusted time for the custom circadian rhythm (e.g., 30:00 for 30 hours).
- Changed names of other clocks to Converted Non24-hr and Regular 24-hr (see app description). You may need to change settings values after updating.
- Added option "Sync Format" to specify whether the sync date and time should follow the Regular Non24 clock (beginning of Non24 day) or the Converted Non24 clock (sync Non24 with 24 clock).
- Added link to calculator spreadsheet in app description.
- Increased small font sizes and steps bar height for high-res screens.
- Added support for new devices.
- Improved efficiency and fixed bugs.
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v1.4.1, December 19, 2023:
- Added option to display secondary clock in top right field.
- Removed settings for Top Right Field Visible and Bottom Field Visible to save memory. Instead use “None” to hide these fields.
- Improved efficiency.
- Fixed bugs.