Red Sift is the enterprise attack-surface platform. If you just need certificates watched, the bill is simpler elsewhere.
Verified 19 Aug 2026
Red Sift Certificates, formerly Hardenize and now part of the Red Sift Pulse platform, is a genuinely strong product. It monitors the Certificate Transparency ecosystem in real time and flags unauthorized issuance within minutes, discovers certificates across public and private PKI, and is Let's Encrypt's officially recommended certificate-monitoring service. For an enterprise consolidating attack-surface and email security under one roof, it is a serious tool, and this page will not pretend otherwise.
Two things make a certificate-first tool the simpler fit.
Pricing. Red Sift's free Certificates Lite tier covers up to 250 certificates with a daily port-443 scan and a 7-day email expiry alert. Above that, enterprise pricing is quote-only — you talk to sales. CertPost is flat and public: three certificates free, then $29/month for unlimited, no call.
Scope and alerting. CertPost reads the served certificate from a real handshake on any TLS port, mail and admin ports included, and warns on a ladder — a month, a fortnight, a week, and a day before expiry — rather than a single 7-day email. Alongside the certificate and Certificate Transparency, it also watches domain-registration expiry and DNS drift, so the certificate, the name, and the records around it are one tool rather than several.
If you need enterprise PKI inventory and attack-surface analysis, Red Sift is built for exactly that. If certificates are the job and you want transparent pricing and multi-window alerts without a sales call, a focused tool is less to run.
Trying CertPost next to Red Sift:
1. Sign up free and paste the certificates you care about most.
2. Add the parts a certificate scan skips: mail and admin ports, and the apex domain for registration expiry.
3. Compare the alert timing — a laddered warning versus a single 7-day email — on a certificate that is due soon.
Import your domain list in 2 minutes — 3 certificates free, no card.
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