K3N8HReaction Time Tester
5 rounds, real millisecond timing via performance.now(), false-start detection — no download.
K3N8H Verified
- ✓ Real preview shipped
- ✓ License terms specified
- ✓ Actually run before listing
- ✓ Stated limitations verified
Click when the box turns green across 5 rounds; the game measures your real reaction time with the browser's high-resolution timer and rates each result against commonly-cited human reaction-time ranges. Clicking too early is caught and tracked separately as a false start.
Runs where you work
Built for a private workflow: local-first execution, no forced cloud dependency, and a clear path to use it on a laptop or phone without an API key.
Included value
Each product is designed to feel personal, useful, and complete without turning your work into an external dependency.
Free tools that go with this
These run in your browser, need no account, and keep what they remember on your own device.
Preview
Open full preview →This product is a live, in-browser experience — not a file to preview.
Free to play right now, in this browser, no download or account required.
Play now →Verified with an automated test script covering rating boundaries and false-start handling — all 7 cases passing.
What's included
- Live playable game at /play/reaction-time (free, unlimited plays)
- Commercial license: white-label/embed this game on your own site
Built with
Runs in your browser: nothing to install
Scoring logic (src/lib/reaction-time/engine.ts) is pure and unit-tested (scripts/test-reaction-time.ts) — 7 cases including all-false-start and mixed-round edge cases, all passing.
License & pricing
Try it before you buy. This tool is free to use on the site: open it.
Free to Play
Free
For your own work or your own business. No client work, and no resale or redistribution of the files.
Embed / White-Label License
$36
Use across client work or resell the output. No reselling the source files/template itself.
Refund terms are set per product, and checkout through Whop or Gumroad has its own buyer protection. Questions before you buy? Ask in the chat or on the feedback page; we'll help where we can.
Interactive Games — publishing standard
- Required deliverables: Live playable game, no download required, Commercial embed/white-label license (optional tier)
- Disclaimer required
- Proof-it-runs evidence required
- Personal vs. commercial license tiers offered
Runs entirely in the browser. Scope is stated honestly (exact number of careers/paths/events) rather than claiming to model everything.
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