I'm Hongtao. I built SerpPrism because every SEO tool I tried wanted me to paste a URL into someone else's box — which meant handing a client's staging site, or a page behind a login, to a server I don't control. So everything runs client-side. Paste HTML, a URL, or a file — parsing happens in your tab. No account, no upload, no log. Eleven tools: meta tag generator, SERP preview, robots.txt tester, heading analyzer, schema markup generator, Open Graph preview, hreflang generator, UTM builder, keyword density, readability, llms.txt. The guides are built from surveys I ran against real sites — 78 domains for robots.txt, 62 homepages for Open Graph, 61 for JSON-LD — with raw data and method published so you can check the claims rather than trust them. Ask me anything about the parsers.

SerpPrism

Run 11 SEO checks on any page. Nothing leaves your browser.

Run 11 SEO checks on any page. Nothing leaves your browser.