About serpfu

serpfu is a collection of free web diagnostic tools. No signup, no paywalls, no dashboards. Just fast, simple checks for the things that actually matter.

What we check

• Site speed and Core Web Vitals via GTmetrix
• Email authentication (SPF, DKIM, DMARC)
• IP and domain reputation on major blocklists
• Keyword rankings in search results

Why we built this

Most diagnostic tools are either expensive SaaS products with monthly fees, or they're buried inside bloated dashboards you don't need. We wanted something simpler: just run the check, get the answer, fix the problem.

How it works

All checks run through our API routes to protect credentials and enable rate limiting. Some tools use third-party APIs (GTmetrix, ipinfo.io), while others are self-hosted. Everything is transparent and straightforward.

Support the project

serpfu is free to use and always will be. If you find it helpful, consider buying us a coffee or checking out our consulting services at 37solutions.com.