No accounts. No data collection. No ads. Just a fast, accurate network stability test that runs entirely in your browser.
Most "internet speed tests" focus on download and upload bandwidth — the numbers that ISPs love to advertise. But for gamers, remote workers, and VoIP users, the metrics that actually matter are jitter, latency, and packet loss.
Existing tools are often bloated, privacy-invasive, or require Flash/Java plugins. jitter.is is a single HTML page with no external dependencies except a web font. It runs entirely in your browser and never phones home.
jitter.is uses the browser's Fetch API with performance.now() to measure the round-trip time of lightweight HTTP requests. The first 3 requests ("warm-up pings") are discarded to allow TCP and TLS connections to stabilize — this is why our numbers are significantly more accurate than naive implementations that include handshake overhead.
Jitter is computed using the RFC 3550 method: the mean absolute deviation of consecutive latency samples. This is the same algorithm used by VoIP systems and game servers to classify connection quality.
When your browser makes its first request to a new server, it must establish a TCP connection (1 round trip) and complete a TLS handshake (1–2 more round trips). This adds 50–200ms of overhead that has nothing to do with your ongoing jitter. If a jitter tool doesn't account for this, you'll see artificially inflated readings on the first few samples.
jitter.is always warms up the connection before recording results. This is why you might see a "warming up..." state at the start of each test.
The target server matters. If you test against a server in Japan from Europe, you'll see high latency — but that's expected, not a sign of a bad connection. For the most useful results, choose a target in a region that's relevant to what you're doing: the same region as your game server, your company's cloud infrastructure, or your video conferencing provider's servers.
Cloudflare Global is the best default — it automatically routes to the nearest Cloudflare edge node, giving you a reliable baseline for your connection to the modern internet.