hansdezwartandClaude Opus 5
64bc4a9a34
The minutes+seconds stepper is 302px wide. With a label beside it the Time row needs about 422px of viewport, so it has been running off the right edge of the settings sheet on every phone narrower than that — measured 19px off a 390pt iPhone, 34px off a 375pt SE and 89px at 320. The "00 SEC" value and its + button were the part that got cut. Below 420px the row now stacks: label on one line, stepper right-aligned underneath with slightly narrower value columns. That needs 262px against the 276px available at 320px. Wider screens keep the inline layout. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Backgammon Clock
A two-player match clock with simple delay you can actually see. Reserve time plus a fixed number of free seconds each turn that never carry over — the Backgammon Galaxy control. Defaults to 3:00 + 15s.
Plain HTML, CSS and JavaScript. No frameworks, no fonts, no images, no network.
Getting it onto your phone
Chrome will only offer a real install over HTTPS, so the file needs a host. GitHub Pages is free and takes about two minutes:
- Create a new public repository, e.g.
bgclock. - Upload all six files to the root:
index.html,manifest.webmanifest,sw.js,icon-192.png,icon-512.png,icon-maskable-512.png. - Settings → Pages → Source: Deploy from a branch →
main/(root)→ Save. - Wait a minute, then open
https://<you>.github.io/bgclock/on your phone. - Android, Chrome: menu (⋮) → Add to Home screen → Install. iOS, Safari: Share (□↑) → Add to Home Screen → Add. It has to be Safari — Chrome and Firefox on iOS can't install a web app.
Open it from the home-screen icon and it runs fullscreen with no browser chrome, offline, with the screen kept awake while a game is on.
On iOS a few things behave differently, none of them fatal:
- Install from Safari, and play from the home-screen icon. In a Safari tab you lose a strip of the screen to the toolbar, and iOS clears the saved settings of a site you haven't visited for a week. The installed app keeps its own storage and doesn't get pruned that way.
- There's no vibration — iOS gives web pages no haptics at all, so the turn-change buzz is silent there. The sounds still play.
- The ringer switch doesn't mute the clock. The page claims a playback
audio session so you can hear the delay tick with the phone silenced, which
in exchange pauses any music you had going. If you'd rather keep the music,
delete the
navigator.audioSessionline inindex.html. - Screen wake needs iOS 16.4 or newer. Below that the screen dims on its usual schedule mid-game.
If you're using a different path than /bgclock/, edit the "id" field in
manifest.webmanifest to match, or just delete that line.
To try it before hosting, open index.html in any browser — everything works
except installation and the service worker.
Using it
- Tap your own half to end your turn and start your opponent's clock. At the start, whoever taps first sets the other player going.
- The waiting player's taps are ignored, so a stray hand won't stop the clock.
- The bar under the big time is the delay draining. When it empties you get a soft tick and your reserve starts moving. That's the moment worth hearing.
- Reset returns to the starting position. It takes two taps: the first arms the button — it lights up and a ring unwinds around it — and a second tap within those two seconds does it. One stray thumb can't wipe a live game.
- Pause freezes mid-turn and resumes exactly where it stopped, delay included. Opening settings pauses automatically, and leaves it paused so the clock only restarts when both players are ready.
Backgammon clocks pause between games, and after a cocked die the delay is normally restarted — use pause and reset for those.
Settings
At the top of the sheet are three presets — 2m / 12s, 3m / 12s and 3m / 15s. Tapping one jumps both timers there and lights it up. Change the time or delay by hand and the highlight goes out; land back on a preset's numbers and it comes back on.
| Setting | Range | Default |
|---|---|---|
| Time | 0:15 – 99:00 | 3:00 |
| Delay | 0 – 60 s | 15 s |
| Colour | Sage, Brass, Slate, Teal, Plum | Sage |
| Sound | on / off | on |
Brass is the colour in the chess.com app, if you want the exact original look.
Changing time or delay resets the clock. Settings are kept in localStorage, so
they survive closing the tab, force-quitting the installed app and rebooting the
phone — the app also asks for persistent storage so they aren't evicted when the
device runs low on space (Chrome honours that request; Safari ignores it). Only
the settings are stored; a game in progress isn't.
Sounds
All three are generated with the Web Audio API, so there are no audio files to download and nothing to attribute.
- Turn change — a soft rising fifth with an octave partial, marimba-like.
- Delay expiry — a single quiet 300 Hz tick, deliberately easy to miss unless you're listening for it.
- Time out — a falling triad, loud and unambiguous.
Licence
Do whatever you like with it.