An on-page SEO checker that shows you the fix, not just the problem
Most checkers tell you something is wrong. Indexwise tells you why it matters and gives you the exact line to paste in, adapted to your platform where it can.
What it checks, in order
Title and meta description
Flags titles and descriptions that are missing, duplicated, or long enough to get cut off in Google's results, and shows a live preview of how the page will actually look on desktop and mobile search.
Headings
Builds your heading outline as a tree and marks empty headings, repeated headings, and skipped levels (like jumping from an H1 straight to an H3) that make the page's structure harder for both readers and search engines to follow.
Canonical, indexability and hreflang
Checks noindex tags and headers, robots.txt rules, canonical tags, hreflang, HTTPS and mixed content, and compares the raw HTML against what only appears after JavaScript runs — a common source of SEO bugs on JS-heavy sites.
Structured data
Validates your JSON-LD, flags parse errors, and includes a schema generator for the common types if you don't have any yet. (This page's own schema is generated the same way.)
Images and alt text
Finds images missing alt text or width/height attributes, and drafts alt text for you to review and paste in.
Open Graph and social previews
Shows how the page's link preview will look on Facebook, Messenger and X, and flags missing og:image or og:title.
Readability
A plain readability pass on your copy, separate from the technical checks above.
Every one of these runs in one click as part of a full audit, or you can open just the tab you need. For why it runs as a chrome extension instead of a hosted tool, see that page.
Questions
Is there a free on-page SEO checker?
Yes. Indexwise runs every check on this page for free, with no account and no sign-up, as a Chrome extension.
Does it work without signing up?
Yes. The on-page audit needs no account at all. Signing in is optional and only used to save a few extra settings or connect Google Search Console.
How is this different from a paid on-page checker like SEMrush or Ahrefs?
Those tools fetch your page from their own crawler and are built for ongoing site-wide tracking. Indexwise audits the exact page open in your browser for free, with copy-paste fixes, and adds a paid-tool-style bulk audit and watch list on top without a subscription.