CALLCHECK
Is your connection ready for calls?
Latency over time
Awaiting test// Awaiting test
What are we measuring?
CallCheck runs 20 timed requests to Google's servers and uses the results to estimate how your connection will handle a real voice or video call.
Latency is the delay between you speaking and the other person hearing it. Low latency makes conversations feel natural. High latency causes awkward pauses where you both start talking at the same time.
Jitter happens when data packets arrive unevenly. Even if your average latency is fine, big swings between packets make audio sound choppy or robotic. A stable connection has low jitter.
Every call breaks your voice into small chunks (packets) sent over the internet. If some don't arrive, you hear gaps or the audio cuts out. Even 1–2% loss is noticeable on calls.
MOS (Mean Opinion Score) is the industry-standard measure for voice call quality, rated 1–5. It combines latency, jitter, and packet loss into one number using a formula developed by the ITU. Anything above 4.0 is considered excellent.