CertAvert vs Witnessory

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

CertAvert compared with Witnessory
Detail	CertAvert	Witnessory
What it does	Free SSL/TLS certificate monitoring with email alerts	Measures internet adoption of post-quantum cryptography through independent network probes
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	Not given
Pricing model	Freemium	Freemium
Pricing	Free plan: 3 domains, no card needed. Starter: $50/year for 10 domains. Plus: $100/year for 20 domains. Pro: $150/year for 50 domains.	Free: dashboard, one check at a time, and probe. Watch 10: $19/month (up to 10 hostnames). Watch 100: $99/month (up to 100 hostnames). Evidence report: $9 (up to 10 hostnames) or $39 (up to 50). API Free: $0. API Developer: $19/month (2,000 checks/month). API Pro: $99/month (25,000 checks/month). Da
Key features	Certificate expiry notifications at 30 days, 14 days, 7 days, and on expiry Broken chain detection with fix guidance TLS version and cipher checking Domain DNS and registration monitoring Certificate change history and alerts Certificate report for audits Certificate transparency log monitoring No server access or installation required	Real-time post-quantum adoption statistics across top 10,000 internet sites Daily or 6-hourly checks of monitored hostnames from multiple networks Signed and Bitcoin-anchored evidence reports for auditors and regulators API with fresh or reused check results and bulk query support Webhook alerts on any change to monitored sites Monthly dataset of top 10,000 sites' cryptography and certificate data Custom probes inside your own networks for enterprise customers HTTP 402 payment support for agents via USDC on Base Recomputable view hash for transparent, reproducible results Free probe hosting for independent network monitoring
What makes it different	Detects auto-renewal failures before visitors see them Explains broken chains and TLS issues with fix guidance Independent operation with no investors	Every reading is cryptographically signed and results are reproducible and recomputable Neutral and transparent: no result is changed, hidden or ranked for money Global coverage from multiple independent network probes Auditor-grade evidence reports anchored in Bitcoin Free access to core tools: dashboard, single checks, and probe hosting
Community votes	0	0
DR (Domain Rating by Ahrefs)	3 +1 (up) since last check	1 −1 (down) since last check
Trust Flow (Majestic)	1	0
Citation Flow (Majestic)	24	4
Referring domains (Majestic)	14	1

5 details filled in for both companies.

More alternatives to CertAvert More alternatives to Witnessory