Chess CLOCK

Features

Time controls 1+0, 3+0, 3+2, 5+0, 5+3, 10+0, 10+5, 15+10, 30+0 and 60+0, plus your own control set in the app settings (minutes plus Fischer increment per move).
The clock of the player to move is green, turns yellow under 20 s and red under 10 s, and shows tenths under 20 s.
A full-width progress bar for the player to move. It grows from the left edge for the left player and from the right edge for the right player, so you can see whose turn it is at a glance.
Sound cues: a rising or falling tone on every move (you can hear whose turn it is), a tick every second during the last 10 seconds (higher pitch for the last 3), and an alarm when a flag falls.
Pressing the opponent’s button does nothing, so no accidental switches.
Pause and resume at any time.

How to use

Start the app: hold Select → Scripts → Chess Clock, or press ▶ Start in the Apps tab of the web UI. It’s an on-demand app, so it never joins the rotation.
Choose a time control: press Select or turn the knob before the game starts.
Start the game: press your button, and your opponent’s clock begins (like Black pressing to start White’s clock).
Make a move: press your own button after your move. The increment is added automatically.
Pause or resume: press Select.
Reset: when paused or after a flag, hold Left or Right for half a second. After a flag, a press of Select also works.
Exit: hold Select.

Settings

Minutes per player (1–180), default 5
Increment per move (0–60 s), default 0
Sounds on/off

Sounds use the App volume slider in the audio mixer.