tern lens

One-click SEO, live data layer debugging and site diagnostics from tern.

Tern Lens gives you instant SEO checks, live data layer debugging, and site diagnostics, all from one click in your browser toolbar. Built for marketers, developers, and agencies who need fast answers about any page they visit. No more switching between five different tools or digging through source code by hand. What it does: SEO snapshot: title, meta description, headings, canonical tags, and robots directives at a glance Live data layer inspector: see Google Tag Manager and analytics events fire in real time as you browse Site diagnostics: page speed signals, broken redirects, missing alt text, and other common issues One-click reports: copy or export findings to share with a client or teammate Why install it: If you work on websites, whether your own or a client's, you need to know what's actually happening on the page, not just what the code says should happen. Tern Lens shows you the live picture: what tags are firing, what SEO signals are present, and what might be broken, without opening dev tools or asking an engineer. Built by Tern, a digital agency that audits and fixes these exact issues for clients every day. We built Tern Lens because we needed it ourselves.