Best Free SEO Tools Compared: Ahrefs vs SEMrush vs Traffic Lens
Comparing the top SEO tools available in 2026 — what each does best, what it costs, and which combination gives you the most complete SEO toolkit.
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Free tools mentioned in this article
- DNS Lookup — Check A, AAAA, MX, TXT, NS, CNAME records
- WHOIS Lookup — Registrar, expiry, nameservers via RDAP
- SSL Certificate Checker — Certificate expiry and A-F grade
- HTTP Headers Checker — Security score and CDN detection
- Redirect Chain Checker — Trace 301/302 hops, detect loops
- Backlink & Authority Checker — Authority score, PageRank, trust signals
- See all 9 free domain tools