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Most useful things to send us:

Wrong readings — tell us the tool, your OS/browser, and what you expected. A copied report link is perfect evidence.
Devices that fool a test — edge cases make the thresholds better for everyone.
Missing tests — what did you come here to measure and not find?

We read everything; short questions get short answers fast. Please don't send audio recordings — per our own privacy rules we don't want them.