A free, open-source speed trainer for Excel keyboard shortcuts. It runs in the browser, on a spreadsheet engine written from scratch, and the mouse is switched off. Jump, select, fill, anchor with F4, paste values, build a P&L, all against the clock.

No sign-up, no install: open it and press a key. If it made you faster, a ⭐ helps other analysts find it.

Features

• Timed runs, Monkeytype-style. 30 s · 60 s · 120 s · 25 or 50 drills. Score = drills per minute × keystroke efficiency.
• 74 drills + 3 Analyst-mode speedruns. Navigation, selection, editing, formatting, rows & columns, clipboard, formulas (with a real formula engine), sheets, ribbon keytips.
• Daily challenge with a shareable result: cellrush daily #42 ⏱ 48.3s 🟩🟩🟨🟩⬛…
• Leaderboards you can trust: every run is replayed keystroke by keystroke on the server. By country and by school, too.
• Windows and Mac shortcuts, US / UK / AZERTY / QWERTZ layouts, English and French, 8 themes, and a Learn mode that brings back what you miss.

Modes

Mode	What
Play (/)	Timed run of random drills. Filter by category.
Daily (/daily)	Same 10 drills for everyone today. First attempt is ranked.
Speedrun (/speedrun)	Format a P&L to banking standards, Build a revenue projection, Clean a data dump. Checklist at the end.
Learn (/learn)	No timer. The keys appear after 4 s of hesitation. Missed shortcuts come back more often.
Sandbox (/sandbox)	A free grid to try things.

Themes

Dark	Light	Terminal green

Plus amber terminal, navy, paper, high contrast and navy & gold. Add yours →

Keyboard support

	Windows	macOS
Shortcut set	Excel for Windows	Excel for Mac (Cmd-based). No invented equivalents: drills with no Mac shortcut (ribbon keytips, font colour) are Windows-only.
Source	Shortcuts are checked against Microsoft's Keyboard shortcuts in Excel, per platform, and each one records whether it was (verified in the registry). A few Windows ribbon keytips (Alt, H, O, I…) aren't on that page: they're marked unverified and stay in Learn mode and practice runs, never in ranked modes or the Daily (ranked.ts).	same
Layouts	US, UK, French AZERTY, German QWERTZ: letter shortcuts follow the printed key, digit-row shortcuts the physical key (details).	same

Browsers. Chrome and Edge give the most keys to the page, and fullscreen + Keyboard Lock frees the rest. Some combos (Ctrl/Cmd + W, T, N…) belong to the browser, so drills avoid them. You can check your own browser at /keys; its results feed the capture matrix. Playing needs a physical keyboard; on phones, the leaderboards still work.

Performance

Measured on the production build: a keystroke goes from keydown to an updated grid in 0.6 ms median, 7 ms p95 (budget: one 16 ms frame). Lighthouse: 98–99 performance, 100 accessibility, best practices and SEO. Every page except the game loads on demand.

How it works

packages/engine   spreadsheet engine from scratch: grid, selection, edit modes, undo/redo,
                  formula parser + evaluator, reference shifting, keymap (Win/Mac × 4 layouts)
packages/drills   74 drills + 3 scenarios as data, seeded RNG, run engine, scoring, replay validation
apps/web          React + Vite + Tailwind UI
supabase/         Postgres + RLS, auth, and the submit-run Edge Function that replays every run

The server never trusts a score: the browser sends only keystrokes, the Edge Function replays them with the same engine bundle and computes the score itself. Runs that look scripted (inhuman speed, robotic timing, impossible drills/min) are stored but not ranked. More: ARCHITECTURE · SCORING · SERVER.

Tested: 443 engine tests, 768 drill tests (a bot plays every drill's optimal path on both platforms and four layouts), 16 server integration tests (tampered scores, RLS, rate limits), 24 Playwright end-to-end tests (full 60 s runs on Windows and Mac keymaps).

Self-hosting

1. pnpm install (Node 20+, pnpm 10).
2. Create a Supabase project, then supabase link and supabase db push (migrations in supabase/migrations).
3. pnpm build:edge && supabase functions deploy submit-run.
4. On Vercel, import the repo with root apps/web, and set VITE_SUPABASE_URL and VITE_SUPABASE_ANON_KEY.
5. Deploy. vercel.json already routes /r/:id share links and the /api/og preview image.

Local development with Docker: pnpm db:start && pnpm env:local && pnpm dev, see docs/SERVER.md.

Contributing

New drills and themes are the best first PRs: plain data, with a test that tells you when it's right. Start with CONTRIBUTING.md and the good first issue label.

Star history

Credits

Made by Joaquim, founder of Aptence & QuantAcademy.

AGPL-3.0. You can self-host and modify cellrush; if you run a modified version as a public service, you must publish your changes under the same license.

Not affiliated with Microsoft. Excel is a trademark of Microsoft Corporation.