SSL Certificate Checker

SSL Certificate Checker helps you monitor SSL/TLS certificate health for the websites and services you care about.

Add one or more targets (hostname + port, default 443), run a check instantly, or scan your whole list in one tap. The app is designed for a quick daily workflow: open, scan, review risk, and act.

What you can check:

- Expiry date and days left

- Status classification: OK, Expiring, Expired, Failed

- Issuer and subject

- SAN (Subject Alternative Name)

- Serial number and signature details

- SHA-256 certificate fingerprint

- SHA-256 public key fingerprint

- Negotiated TLS protocol and cipher suite

Key workflows:

- Single target check for immediate troubleshooting

- Full list scan for regular maintenance

- Saved targets and latest results stored locally on device

- Optional periodic background checks (can be turned on/off)

Built for practical certificate operations:

- Quickly identify certificates close to expiration

- Compare protocol/cipher negotiation outcomes

- Keep a simple watchlist for internal or public endpoints

- Generate and review report-style outputs inside the app

Security perspective for connected-device teams:

- Includes TLS protocol and cipher suite visibility to support baseline security reviews

- Helps teams spot weak or unexpected negotiated ciphers during routine checks

- Useful as an evidence aid for internal security discussions and release readiness

- Designed as a practical checker, not a complete legal/compliance assessment tool

Regulatory context note:

- In the EU, RED cybersecurity delegated requirements under Directive 2014/53/EU Article 3(3)(d)(e)(f) apply from August 1, 2025 for covered products

- This app can support early HTTPS/TLS posture checks, but it does not certify compliance with RED-DA, EN 18031, or any other regulation/standard on its own

Privacy and control:

- No account is required to start checking

- Targets and recent check results are kept locally for your routine usage

- Privacy policy and terms are available from within the app

Current release focus:

- Core SSL/TLS checking flow and result parsing are available

- Batch checking and retry flow are available

- iOS background checks are best-effort (system-scheduled)

- Android periodic checks are supported with system scheduling

- Multilingual UI foundation is integrated; some languages are still being refined

This app is suitable for developers, operators, site owners, and anyone who wants a simple way to track certificate validity and TLS configuration from a mobile device.