Website grader
A report card for any page: A–F grades for speed, accessibility, best practices and SEO from Google Lighthouse, plus our own checks for page weight, caching, render-blocking files, robots.txt and social previews, 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
What is a website grader?
A website grader is an automated tool that loads a page, runs a set of technical checks (speed, mobile-friendliness, SEO basics, accessibility, security) and turns the results into scores or grades with a list of fixes. It is a quick health check, not a full audit: it can’t judge content quality, backlinks or design.
Is 75 a good SEO score?
In Lighthouse, 75 sits in the “needs improvement” band (50–89), a C on our scale. It usually means a few basics are missing, such as a meta description, descriptive link text or a crawlable link. Each failed check is listed with how to fix it, and most are quick wins.
Is there a free tool to check my website’s quality?
Yes, this one. It is free, needs no sign-up, and combines Google Lighthouse, real-user Core Web Vitals and our own server-side checks (page weight, caching, render-blocking files, robots.txt, structured data and Open Graph tags).
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.