Free checkers

Tools with a check or a plan you can use without paying. Trials are not listed here unless a lasting free tier was on the vendor page.

Category top spot is open. If it sells, the paid listing will be labeled Sponsored and will sit above this list. It will not change the A–Z order. See the rate card.

Bitwarden
Freemium
Password manager with a free personal account and printed paid prices.
Password managers · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Dragons Eye
Made by usFree
A public ransomware leak-site tracker. No paywall on the page we loaded.
Breach and leak-site monitoring · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
EasyDMARC
Freemium
DMARC monitoring with public record checkers and printed prices for the paid plans.
DMARC, SPF, and DKIM · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Have I Been Pwned
Free
Free check for whether an email address shows up in known data breaches.
Breach and leak-site monitoring · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Keeper
Freemium
Business password manager with a trial, free side tools, and a family plan for users.
Password managers · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
KnowBe4
Freemium
Security awareness training, plus a free phishing simulation sandbox.
Phishing simulation and training · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Let's Encrypt
Free
Free TLS certificates from the nonprofit Internet Security Research Group.
Free checkers · Uptime and certificates
Free tier checked. Checked 14 Oct 2026.
Read the note
MXToolbox
Free
Public DNS and mail lookups, including MX records and blacklist checks.
DMARC, SPF, and DKIM · Domain and DNS monitoring · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
OrionCmd
Made by usFreemium
Uptime, certificates, and passive website checks, with one website free.
Uptime and certificates · Domain and DNS monitoring · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Postmark DMARC
Freemium
A free weekly DMARC email from Postmark, plus a paid digest at $14 a domain.
DMARC, SPF, and DKIM · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
ransomware.live
Free
A public ransomware leak-site monitor you can read without an account.
Breach and leak-site monitoring · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Red Sift OnDMARC
Freemium
DMARC product with a 14-day trial and a free DMARC check.
DMARC, SPF, and DKIM · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
SSL Labs
Free
Free public test of a website's TLS configuration, run by Qualys.
Uptime and certificates · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
UptimeRobot
Freemium
Uptime monitoring with 50 monitors on the free plan.
Uptime and certificates · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note
Valimail
Freemium
DMARC platform with a free Monitor account and a paid Enforce product.
DMARC, SPF, and DKIM · Free checkers
Free tier checked. Checked 14 Oct 2026.
Read the note