Video Call Stability Test
This test runs a small simulated call: a stream of video comes down and a stream goes up, the way they do in a real call, while it watches your delay and jitter. Every second that a stream is late is a moment a real call would freeze, and the result is an estimated call quality score from 1 to 5.
Test duration
Short tests are useful for quick checks. Longer tests are better for finding intermittent problems.
Free, no signup. Sends call-like traffic both ways: about 15 MB in total for this duration, so avoid it on metered data.
Customize: goal, connection type
Connected via (optional — sharpens the diagnosis)
What the call simulation measures
Their video, coming in
A steady 2.5 Mbps stream arrives once a second, like the other person on a call. We report how much of it arrived in time.
Your video, going out
A steady 1.5 Mbps stream leaves once a second, like your own camera. Upload is the usual weak side of home connections, so it is scored separately.
Freezes
A stream chunk that is not complete within its second is a moment a call would stall or break up. Neighbouring late seconds count as one freeze, and the longest is reported.
Estimated call quality
Delay, jitter and late chunks are combined into a score from 1 to 5, the way phone-call quality is rated (MOS). A clean line tops out around 4.4, so a steady 4.4 means nothing is holding the call back.
What the animation is
The two talking-head tiles are an illustration: they blur, pixelate and freeze when the measured jitter, lost requests and disconnects say a real call would. The numbers around them are the measurement.
Why calls are more sensitive to jitter and loss than raw speed
A video call is a small, steady stream that has to arrive on time, every time. A fast connection with occasional jitter or loss can feel worse on a call than a slower, steadier one, because the call app has very little time to wait for a late packet.
That is why this test sends call-like traffic in both directions instead of only timing small requests, and why it reports late seconds and freezes rather than just an average.