About

CertSeal instantly checks any website's SSL/TLS certificate — directly from your device, with no accounts, no servers, and no data collection.

Type a domain and see:

Certificate grade (A+ to F)
Days until expiry with clear color coding
Issuer and subject details
Full certificate details on demand

Built for developers, sysadmins, and anyone who needs to verify an HTTPS connection is healthy. All checks run peer-to-peer from your iPhone straight to the target server. Nothing goes through our infrastructure.

Pro unlock adds:

Batch check up to 20 domains at once
Export results via share sheet
Full certificate details (serial, algorithm, SAN names)

Core Capabilities

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