One saved result: a whole-site audit you ran, or one daily scan of a site you watch. Each reading has the errors and warnings found at that moment, so the trend is a series of real measurements rather than an average.

Why does it need three readings before it calls a direction?

Two points always draw a straight line, so two readings can look like a trend when they are just noise. Three is the first number where the direction means something. Until then this page shows the readings and says plainly that there is not enough to judge.

What is the difference between an error and a warning?

An error is something that breaks now, like a page that cannot be fetched or a feed item that will be rejected. A warning is something that is worth fixing but is not breaking yet. Errors count first when the direction is worked out.

Is this page private?

Yes. It shows only the audits and watches saved to the account that is signed in. There is no account identifier in the address, in the page or in the script; the browser asks the site for its own session, and signed out the page asks you to sign in.

Is your site getting better or worse?

Every audit you have saved and every daily scan of a site you watch, in order, over the last 90 days. One line, so the direction is visible instead of guessed at from the last result alone.

Reading your history…

One moment.

How this works

A single check tells you about today. It cannot tell you whether the site is drifting, because there is nothing to compare it to. This page lines up the readings your account has already produced — saved audits and watch runs — and works out the direction from the first to the last. Fewer than three readings and it says so rather than drawing a line through two dots. Every reading is listed as a number below the chart, so the data is readable without the graphic.

Questions

What is a "reading"?: One saved result: a whole-site audit you ran, or one daily scan of a site you watch. Each reading has the errors and warnings found at that moment, so the trend is a series of real measurements rather than an average.
Why does it need three readings before it calls a direction?: Two points always draw a straight line, so two readings can look like a trend when they are just noise. Three is the first number where the direction means something. Until then this page shows the readings and says plainly that there is not enough to judge.
What is the difference between an error and a warning?: An error is something that breaks now, like a page that cannot be fetched or a feed item that will be rejected. A warning is something that is worth fixing but is not breaking yet. Errors count first when the direction is worked out.
Is this page private?: Yes. It shows only the audits and watches saved to the account that is signed in. There is no account identifier in the address, in the page or in the script; the browser asks the site for its own session, and signed out the page asks you to sign in.