Clear, light weight, maximum battery saving, with seconds shown (in smaller fonts) on the digital clock, and the MAR:

MAR (Mean Activity Ratio) is an indicator calculated with proprietary algorithm and backed by science, reflecting your physical activity level during a period of time.

You'll see two values on the bottom left of the clock face. The first one is today's MAR (estimated whole day MAR). You'll see it increases with your activities during the day.

The second one is your 7-day MAR, based on your data from 7 days ago till yesterday. It is regenerated at midnight every day.

Tap the MAR values to show more detailed information.

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To change 12h/24h time format: visit https://www.fitbit.com/settings/profile, scroll down to find "CLOCK DISPLAY TIME" setting, select your desired format, click Submit and sync your device.

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Some MAR values and corresponding activity levels:

20: Sedentary (little or no exercise, desk job);

38: Lightly active;

55: Moderately active;

72: Very active;

90: Extra active (frequent hard exercise);

110: Extremely active;

150: Estimated upper limit in general population (non-athletes) at sea level on a 7-day basis.

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Note: This app provides 72-hour full-featured trial. A one-time payment of US$2.68 will be required thereafter.

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If you are interested in MAR but doesn't like the watch face, please have a look at the MAR app:

https://gallery.fitbit.com/details/7d309e13-6986-4607-8699-fa456d5837c6