SEO Coolkit

Developer-focused SEO utilities

22 tools available · 22 total

A toolbox, not a tool.

Free, extensible SEO utilities built for developers. No subscriptions, no lock-in — just fast, composable tools under one roof.

MetaFree

Meta Checker

Bulk-check SEO meta tags across multiple URLs with toggleable fields and CSV/JSON export.

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MetaFree

Canonical Checker

Verify canonical tags match their page URLs. Feed in a sitemap.xml or paste URLs manually — mismatches flagged instantly.

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CrawlFree

Redirect Checker

Trace full redirect chains for a list of URLs. See every hop, status code, destination, and response time.

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CrawlFree

Sitemap Validator

Parse and validate XML sitemaps, checking for errors and unreachable URLs.

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SocialFree

Open Graph Previewer

Preview how URLs appear when shared on Facebook, Twitter/X, and LinkedIn. Accordion list — click to expand any URL.

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Structured DataFree

Schema Markup Viewer

Extract and display structured data (JSON-LD, Microdata) from any page.

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CrawlFree

Broken Link Scanner

Scan pages for dead or broken links. Feed a sitemap or paste URLs manually — results grouped per page.

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MetaFree

Heading Structure

Audit H1–H6 heading hierarchy across pages. Flags missing H1s, duplicate H1s, skipped levels, and empty tags.

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CrawlFree

Tracking Script Auditor

Detect GA4, GTM, Matomo, Facebook Pixel, HotJar, and 12 more trackers across your pages. Add custom IDs or patterns to verify your specific scripts are firing.

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CrawlFree

Word Search

Search for a word or phrase across multiple pages. Fully renders JS-heavy sites, then shows every occurrence with surrounding context. Great for brand renaming audits.

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CrawlFree

Sitemap Extractor

Extract all URLs from any sitemap.xml — including sitemap index files. Copy the list, export to CSV, or view as a table with lastmod and priority.

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MetaFree

Thin Content Detector

Scan pages and flag thin content by word count. Nav, header, and footer text excluded. Sorted thinnest-first.

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CrawlFree

Orphan Page Finder

Crawl your site and find pages that exist in the sitemap but have zero (or very few) internal links pointing to them.

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MetaFree

Image Audit

Scan pages for images and audit alt text, file size, dimensions, format, and loading attributes.

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PerformanceFree

Page Speed Batch

Run Lighthouse performance scores across multiple URLs in one go.

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MetaFree

Indexability Checker

Check whether pages can be indexed by Google — surfaces noindex tags, X-Robots-Tag headers, redirect chains, and canonical mismatches in one verdict per URL.

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CrawlFree

Sitemap vs Crawl

Compare what's declared in your sitemap against what a crawler actually discovers. Flags pages missing from the sitemap and sitemap pages with no internal links.

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CrawlFree

Robots.txt Tester

Paste a robots.txt (or pull from a domain) and test whether specific URLs are allowed for Googlebot, Bingbot, or any user-agent. Shows the matching rule.

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InternationalFree

Hreflang Checker

Audit hreflang tags across multilingual pages. Flags missing reciprocals, invalid language codes, missing self-references, and missing x-default.

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MetaFree

SERP Snippet Preview

Preview how titles and meta descriptions render in Google search results. Pixel-width truncation, mobile/desktop toggle. Pull live from URLs or paste manually.

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InternationalFree

Locale Render Check

Simulate visiting a single page from a specific country. Sends Accept-Language + CDN geo hint headers, traces the redirect chain, and verifies the final page's language matches the locale.

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CrawlFree

Sitemap Generator

Crawl a domain from its homepage, discover all internal pages via BFS link-following, and export a valid sitemap.xml with optional lastmod, changefreq, and priority fields.

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