The sentence at the top

At the top of Check, Plain Air says what it found in one sentence, then one line on what it means for you. For example: Your Wi-Fi is quick, but it pauses on a beat, about every 0.5 s. and under it, “26 of 150 replies from your router took over 40 ms, up to 211 ms. That’s enough to make calls stutter.”

• Which part. The sentence names the stretch: your Wi-Fi (your Mac to your router), your internet (your router to Apple), or names (looking up addresses).
• Only what was measured. Every number comes from the check a moment ago. A cause is named only when a measurement shows it; otherwise Plain Air says what it saw and what to try.
• The most important first. When more than one thing is off, the sentence is the one that matters most: no internet comes before slow internet. The changes for all of them are in What to change, and the report lists them all.
• It says when it’s fine. “Your Wi-Fi and your internet are both fine. Nothing to change.” is a whole answer.
• It says when it can’t tell. “Plain Air couldn’t get an answer from your router.” The internet times are still right.

The same sentence heads the menu bar panel and the report. Every sentence Plain Air can give, with what it suggests: Every answer Plain Air can give.