Free online cube timer

A speedcubing timer that remembers your progress

Most online timers forget you the moment you close the tab. Sub-X is built for cubers chasing a goal: time your solves here for free, then create a free account to keep every solve, watch your AO100 trend build over weeks, and get a data-driven estimate of exactly how many solves it'll take to hit your next sub-X.

• WCA scrambles & inspectionRandom-state scrambles and a 15-second inspection phase, just like competition.
• Bluetooth smart cubeConnect a supported cube for move-by-move reconstructions, TPS, and phase splits.
• 3×3, 4×4 & 5×5Independent scrambles and stats per event — switch with one tap.
• Your solves, savedSign up free and your guest solves come with you — and sync across devices.

Frequently asked questions

Is the Sub-X cube timer free?

Yes. The timer is completely free, with WCA-compliant scrambles, inspection, and Bluetooth smart-cube support for 3×3, 4×4, and 5×5. No payment and no sign-up are required to start timing.

Do I need an account to use the timer?

No. You can start timing immediately as a guest. Your solves are saved in your browser on this device. Creating a free account keeps them forever, syncs them across devices, and unlocks your AO100 trend, growth prediction, and public profile.

Does the timer use official WCA scrambles?

Yes. Scrambles are generated with a WCA-style random-state scrambler, and a 15-second inspection phase is available — the same format used in official competitions.

Can I connect a Bluetooth smart cube?

Yes. Connect a supported Bluetooth smart cube to time hands-free and get move-by-move reconstructions with TPS and per-phase (cross, F2L, OLL, PLL) splits — all in the browser, with no app to install.

What happens to the solves I record as a guest?

Guest solves are stored locally in your browser. When you sign up or sign in, they are automatically imported into your account so nothing is lost when you switch from guest mode.

Does the timer work for 4×4 and 5×5?

Yes. Switch events at the top of the timer. Each event gets its own scrambles, session stats, and — once you sign in — its own independent AO100, targets, and AI coaching.