Measure your connection, then understand the numbers
One tap measures download, upload, latency and jitter — alongside your IPv4 and IPv6 addresses, and an open explanation of how each figure is calculated.
Ready to test
—
Mbps
- Latency
- Download
- Upload
Ready to test
—Mbps
—Mbps
—ms
—ms
Why Laju
A number on its own is not enough
High throughput does not always feel fast. Laju surfaces the things that are usually hidden, so you can judge for yourself.
IPv4 and IPv6 together
Most tools show only one address. Laju checks both through separate hostnames, so you can tell whether your network is IPv6-ready.
Latency while the line is busy
We measure latency again during the download. The difference explains why video calls stutter on connections that are supposedly fast.
No account, no ads
No sign-up, no advertising trackers, and test history that never leaves your own browser.
A method you can inspect
Durations, parallel connections and warm-up windows are published on the How It Works page instead of being treated as a secret.
Method
We write down what is actually measured
Every run pulls random data from our own server, counts the bytes that truly arrive, and discards the warm-up window before averaging.
A Laju result describes the path between your browser and one test server at that moment. It is not an official measurement for a claim against your provider, and it can differ from tools that use other servers, durations or connection counts.
Ready to see how your connection is doing?
The test takes about half a minute and asks for no personal details at all.