Website grader
A report card for any page: A–F grades for speed, accessibility, best practices and SEO, with the specific checks it failed and a fix plan written for your platform.
Runs Google Lighthouse on mobile and desktop at the same time, plus real-user Chrome data. Takes about 20–40 seconds.
How the grades work
| Grade | Lighthouse score | What it usually means |
|---|---|---|
| A | 90–100 | Nothing serious to fix. Keep an eye on it after big changes. |
| B | 80–89 | One or two clear issues, often images or a heavy script. |
| C | 65–79 | Several problems adding up; visitors on phones will notice. |
| D | 50–64 | Structural issues such as render-blocking resources or large JavaScript bundles. |
| F | 0–49 | Lighthouse’s “poor” range. Start with the top item in “What to fix first”. |
Grades are per device. It is normal to get an A on desktop and a C on mobile: the mobile test runs on a throttled phone profile. Fix mobile first, since that is where most visits happen.
Questions people ask
How are the letter grades worked out?
Each Lighthouse category score maps to a letter: A is 90–100, B is 80–89, C is 65–79, D is 50–64 and F is below 50. The A boundary matches Lighthouse’s own “good” line at 90, and anything under 50 is what Lighthouse calls poor.
What does the website grader check?
Speed (Lighthouse performance and Core Web Vitals), accessibility, best practices such as HTTPS and console errors, and on-page technical SEO. It doesn’t judge design or content quality.
Is a website grade the same as an SEO score?
No. The SEO grade only covers technical basics a machine can check. Rankings depend far more on content, links and real-user experience than on a Lighthouse SEO score.