Free Tools for Founders & Developers
Check website SEO, Domain Rating, WHOIS, certificates and email DNS, or prepare content with ten free tools. No account required.
7 public-data checks · 3 browser utilities
SEO
Inspect homepage signals, backlink strength and structured content.
Website SEO comparison
Compare two websites for on-page SEO, titles, headings, canonical tags, indexing signals and Ahrefs Domain Rating. Export the results as CSV.
Public data · CSV exportDomain Rating checker
Check Domain Rating (DR) for free using Ahrefs data. See backlink-profile strength on a 0–100 scale, with a measurement time and CSV export.
Public data · CSV exportBulk Domain Rating checker
Check Ahrefs Domain Rating for up to 10 domains at once. Compare DR scores, measurement times and unavailable results in a downloadable CSV.
Up to 10 domains · CSV exportFAQ schema generator
Generate FAQPage JSON-LD from your visible questions and answers. Copy or download FAQ schema markup directly in your browser, without an account.
On your device · Copy or downloadDomains
Research registration records, dates and nameservers.
Domain WHOIS lookup
Look up public WHOIS domain details through RDAP: registrar, registration and expiry dates, nameservers and domain status. No account required.
Public data · CSV exportBulk WHOIS lookup
Run a free bulk WHOIS lookup for up to 10 domains. Compare registrar, expiry dates and nameservers using RDAP, and download a timestamped CSV.
Up to 10 domains · CSV exportEmail & security
Check certificates and published email configuration.
SSL certificate checker
Check an SSL certificate for expiry, hostname match, trust and issuer. Inspect the negotiated TLS version for a public HTTPS domain for free.
Public data · CSV exportEmail DNS checker
Check SPF, DKIM, DMARC and MX records for your email domain. Inspect published DNS policies and mail server priorities, then export a CSV report.
Public data · CSV exportContent
Prepare readable URLs and understand your writing.
URL slug generator
Generate a readable URL slug from a title. Convert spaces to hyphens, normalize accented characters and keep Unicode letters in your browser.
On your device · Copy or downloadWord counter & reading time calculator
Count words, characters and paragraphs for free. Estimate reading time with an adjustable reading speed, with text processed in your browser.
On your device · Copy or downloadClear sources, practical limits
Network tools contact public websites, DNS resolvers, registries or Ahrefs. Checks are rate-limited and may reuse recent readings; every report shows its source and observation time. A failed lookup is shown as unavailable.
Your input stays out of public discovery
Browser utilities work on your device. Network queries are not published, added to the page URL or saved to your account. Do not enter private addresses or secrets. These checks do not guarantee security, deliverability or search rankings.