About the Network Test.
ToolCheckup's network test is a free diagnostic that runs entirely in your browser. Press Start and it times real data transfers to a nearby server to report your download speed, latency (ping) and jitter — plus your browser's own connection estimates — so you can see how your connection is actually performing without installing an app or creating an account.
What this tool is for
"My internet feels slow" is hard to act on. This page turns that feeling into numbers you can compare and share. The download reading shows how much data your link can actually pull; the latency reading shows how responsive it feels; and jitter shows whether that responsiveness is steady or erratic — the difference between a smooth video call and a stuttering one. Run it room by room to map Wi-Fi coverage, run it before and after a plan change, or run it a few times and download the report to hand your provider concrete evidence instead of a vague complaint.
Privacy, in one paragraph
The measurement runs in your browser. The only network traffic is the test transfer itself — to a public speed-test endpoint used to time your connection — and your results are never uploaded to us or stored on any server of ours. There is no recording, no fingerprinting, and no account. Your theme and language preferences live in your browser's local storage and never leave your machine. See the privacy policy for the boring details.
Found a bug? Want a tool?
Tell us what broke (with your browser, OS and connection type) or what you'd like tested next — we read everything.
Site FAQ
Is the network test really free?
Yes — the whole tool, no paywall, no sign-up. The site is supported by voluntary donations ("buy me a coffee") and may show unobtrusive ads that never cover or push down the test.
Is this as accurate as a dedicated speed-test app?
It's an honest, repeatable estimate rather than a lab benchmark. A browser test measures throughput to one nearby server over HTTPS and can't open the many parallel connections a native app uses to saturate a very fast link, so on gigabit plans it may under-read. For everyday troubleshooting — is my Wi-Fi weak, is my connection steady, is a call going to hold up — it's more than accurate enough, especially run a few times.
Why is my result different each time I run it?
Your connection is shared and conditions change second to second: other devices, Wi-Fi interference, and how busy the test server and the wider internet are all move the number. That's why we suggest running it several times — a healthy connection lands in a tight band, and wide swings are themselves a useful signal that something (usually Wi-Fi) is unstable.
Which browsers work best?
Any modern browser: Chrome, Edge, Firefox and Safari on desktop, plus mobile browsers. Keep the test tab in the foreground — browsers throttle background tabs, which under-reports speed. The left-hand "Connection" estimates come from the Network Information API, which some browsers (notably Safari and Firefox) don't expose; those fields simply show N/A there while the live measurement still works.
Can I link to or embed this tool?
Linking is always welcome. Embedding the page in an iframe isn't recommended — some browsers throttle network requests and timers inside cross-origin frames, which can skew the very measurements the tool depends on.