“testing”

Simple reaction speed test built with Flutter: click as soon as the screen changes.

Measures download, upload, latency and jitter using Cloudflare's test infrastructure.

HTML5 speed test for measuring download and upload speeds, also usable on a local network.

Customizable typing speed test with many modes, word lists and stats; an account is optional.

HTML5 internet speed test that measures download, upload, ping and jitter.

Public HTTP request and response service for testing clients, with endpoints for headers, status codes and delays.

Tests a regular expression with flags against sample text, shows match counts and supports replace.

Minimal typing test with selectable text and time limits.

Configurable random test data generator exporting to SQL, CSV, JSON, XML and more.

Tests how well your browser blocks trackers and how unique its fingerprint looks.

An open-source API client for building and testing REST and GraphQL requests, usable in the browser.

Demo of the open-source FingerprintJS library that computes a visitor ID from browser attributes.

Estimates VO2 max from field tests such as the Cooper 12-minute run and Rockport walk.

Typing test with 3D animation where letters appear as you type, with speed shown at the end.

Typing test that times each hand separately to show whether the left or right hand is faster.

Typing speed test with mechanical keyboard sounds and live stats as you type.

Monkeytype-style typing test where you type real code snippets to measure programming speed.