JrTimer ??Free Professional Speedcubing Timer for All WCA Events
JrTimer is a free, open-source, browser-based speedcubing timer designed for competitive Rubik's Cube solvers of all skill levels. It supports all official World Cube Association (WCA) puzzle events ??from 3x3 to 7x7, Pyraminx, Megaminx, Skewb, Square-1, Clock, and all blindfolded and specialty events ??with official WCA-compliant random-state scrambles generated instantly in your browser.
Unlike simple stopwatch apps, JrTimer provides a complete training suite: real-time Ao5, Ao12, Ao50, Ao100, and session mean statistics, 2D and 3D scramble state visualization, Stackmat timer support via microphone, 15-second WCA inspection with audio alerts, PWA offline installation capability, and multi-language support including English, Traditional Chinese (蝜?銝剜?), Japanese, Korean, Spanish, German, and French.
Supported WCA Events
Key Features
- Official WCA Scrambles: Random-state scrambles for all WCA events, generated locally in your browser for instant results
- 2D & 3D Scramble Preview: Visualize your puzzle's scrambled state before solving to improve inspection efficiency
- Comprehensive Statistics: Ao5, Ao12, Ao50, Ao100, session mean, personal bests, and full solve history with time distribution charts
- Stackmat Support: Connect a physical Stackmat timer via microphone input for WCA-authentic timing feel
- 15-Second Inspection: WCA-accurate inspection timer with 8-second and 12-second voice alerts, configurable per event
- PWA Offline Mode: Install JrTimer on any device and use it fully offline ??no internet connection required after installation
- Multi-Language: Full UI translation in 7 languages for global accessibility
- Privacy-First: All data stored locally ??no account required, no data uploaded to any server
Why Choose JrTimer?
JrTimer is purpose-built for the speedcubing community by speedcubers. It combines the accuracy of official WCA scramble generators with a clean, distraction-free interface optimized for both desktop and mobile training sessions. Whether you are a beginner working toward your first sub-1-minute 3x3 or an elite competitor practicing for WCA nationals, JrTimer provides the tools you need ??completely free and open source.