SEOTyde is a browser extension for on-page SEO auditing that operates entirely within the browser. The extension analyzes title tags, meta descriptions, headings, image alt text, canonical tags, and robots directives to generate an SEO score on a 100-point scale. It includes a search engine preview that displays how pages appear in Google results and on social media cards. The broken link scanner identifies dead internal links, while page speed analysis draws from browser performance metrics. SEOTyde provides readability checks using the Flesch formula and keyword density analysis. The competitor comparison feature evaluates external URLs side-by-side. Score history tracking stores audit data locally, and markdown export functionality converts audits into reports. The extension collects no data, uses no AI APIs, and requires no backend servers. Installation is available through the Chrome Web Store or Firefox Add-ons.