“Testing”

Free tool for testing SQL queries on sample schemas.

Thirty-second typing test reporting words per minute and accuracy.

Tests your microphone and shows the audio level in the browser.

Typing speed test with lessons and statistics for tracking your words per minute over time.

Type a short passage to see words per minute, compared with other test takers.

A simulator that visualizes the reversal in hypothesis testing between the null and the sample.

Pings a host from multiple global locations at once.

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

One-minute typing test reporting words and characters per minute.

Handles unpaired, Welch and paired t tests, giving exact P values and a 95 percent confidence interval.

Series of test sounds to judge headphone frequency response, stereo imaging and distortion.

Click numbered squares in order after they disappear, a working-memory test based on chimp research.

Open-data internet speed test run on the Measurement Lab platform.

Checks hreflang annotations on a page for errors and missing return links.

Tests whether a URL is allowed or blocked by a robots.txt file for a chosen crawler.

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

Tests whether a web server supports Brotli compression.

Tests whether a URL or code snippet is eligible for Google rich results.

Checks that your camera and microphone work and shows device details.

Interactive walkthrough of how a message is checked for SPF, DKIM and DMARC, using a test email address.

Runs a deep analysis of a public server's TLS configuration and grades it.

Web client for connecting to an MQTT broker and subscribing or publishing to topics.

Runs standard or extended DNS leak tests and lists the resolvers and their locations.

Tests whether a URL uses a permanent or temporary redirect and detects chains.