Displays a digital clock as large as possible (with no clutter). Much bigger than any other app. For maximum readability.

If the digits of the current time are narrow like “1:11” it will use a larger font than for a wide time such as “12:55”.
Suitable for use as a bedside alarmclock.
There are discreet ads and a few options (always landscape/portrait, transparent, etc).

Works on any size device including tablets.