Robots.txt & Sitemap Validator
Check a site's robots.txt rules and XML sitemaps for errors, blocked or non-200 URLs, and noindex pages listed in the sitemap, in one report.
Economics
- Pricing example
- $9 for 50 site checks (first 3 free)
- Daily math
- 2-3 packs a day x $9 = $18-27/day.
- Target if you hit the daily math
- Target: $550 - $800 / month if the daily math is hit
Audience and urgency
Audience: Developers, SEO freelancers and agencies launching or migrating websites.
Urgency: A wrong robots.txt rule or a sitemap full of redirected and noindex URLs quietly stops pages from being indexed. These mistakes often ship during launches and migrations and go unnoticed for weeks.
MVP scope
- ✓ Fetch and parse robots.txt per the Robots Exclusion Protocol standard; test URLs against chosen user agents
- ✓ Discover sitemaps and validate XML structure, size and URL limits
- ✓ Sample-check sitemap URLs for status codes, redirects, noindex and canonical mismatches
- ✓ Flag sitemap URLs that robots.txt blocks
- ✓ Shareable report and CSV export; credit packs via Stripe
Omitted features
- - Do NOT crawl the whole site (sample sitemap URLs only)
- - Do NOT claim effects on rankings
- - Do NOT check sites more aggressively than a polite rate limit
Suggested stack
- Frontend
- React + Tailwind CSS
- Backend or API
- Node worker (Cloud Run or Fly.io) with a standards-compliant robots.txt parser; Supabase for reports and credits
- Payments
- Stripe Checkout (credit packs)
- Hosting
- Vercel for the front end; Cloud Run or Fly.io for the worker
Repository metadata
- Blueprint ID
robots-sitemap-validator- Category ID
dev_tools- Monetization ID
usage_pack
Day-one distribution
Channels
- Reddit r/TechSEO and r/webdev (follow rules)
- SEO communities on X (Twitter)
- Free robots.txt tester page
Reddit strategy
Share the free robots.txt tester and a checklist for launch and migration day.
Cold outreach or directory hook
Offer web agencies a free pack for their next site launch.
Search keywords
robots.txt tester, xml sitemap validator, check sitemap urls status
One-shot master prompt
Build a "Robots & Sitemap Validator" with a React + Tailwind front end and a Node worker. Core requirements: 1. Input a domain; fetch /robots.txt and parse it with a library that follows RFC 9309 (groups, allow/disallow precedence, wildcards, $). Provide a URL tester for selected user agents. 2. Discover sitemaps from robots.txt and common paths; parse sitemap indexes and gzip files; validate XML, the 50,000-URL and 50 MB limits, and date formats. 3. Sample up to 500 sitemap URLs (polite: 2 requests per second): record status, redirect target, meta robots/X-Robots-Tag noindex, and canonical URL. 4. Report sections: robots errors/warnings, sitemap errors, URLs blocked by robots, non-200 URLs, noindex URLs, canonical mismatches; share link and CSV export. 5. 3 free checks, then Stripe Checkout ($9 for 50).
Comparable products
Published 2026-10-08.
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