voiddo sslcheck vs sslchecker.com
Both inspect SSL/TLS certificates. This page compares technical depth, CI integration, SANs reporting, expiry monitoring, and when each tool fits your workflow.
voiddo sslcheck — use when
- You want full technical cert details: SANs, key algorithm + size, chain depth, expiry
- You need CI/cron-compatible exit codes (0=valid, 1=warning, 2=critical)
- You want a CLI tool via
npm i -g @v0idd0/sslcheckfor scripting - You need a quick browser check with no account or signup
- You want to verify SAN coverage for a specific hostname before deploying
- You want no ads, no email required, free forever
sslchecker.com — use when
- You want automated email alerts before a certificate expires
- You need to monitor multiple domains with a managed dashboard
- You want set-and-forget expiry notifications without maintaining scripts
- You need a shareable scan report URL for a client or team
Feature comparison
| Feature | voiddo sslcheck | sslchecker.com |
|---|---|---|
| TLS certificate check | ✓ yes | ✓ yes |
| Expiry date + days countdown | ✓ yes + severity badge | ✓ yes |
| SANs (Subject Alternative Names) | ✓ full list | partial |
| Key algorithm + size | ✓ RSA/ECDSA + bits | – no |
| Certificate chain depth | ✓ yes | – no |
| CI-compatible exit codes | ✓ 0/1/2 severity | – no |
| CLI npm package | ✓ @v0idd0/sslcheck | – no |
| Automated email expiry alerts | – no | ✓ yes |
| Multi-domain monitoring dashboard | – no | ✓ paid plan |
| Account required | ✓ no | for alerts |
| Free | ✓ 100% | freemium |
FAQ
Is voiddo sslcheck an alternative to sslchecker.com?
Yes. voiddo sslcheck (tools.voiddo.com/sslcheck/) is a free TLS certificate inspector. Enter any hostname and it reports: issuer, SANs, days until expiry with severity badge, key algorithm and strength, certificate chain depth. It is also available as a CLI via
npm i -g @v0idd0/sslcheck for CI pipelines and cron jobs.How is voiddo sslcheck different from sslchecker.com?
sslchecker.com is focused on SSL/TLS cert expiry monitoring with email alerts. voiddo sslcheck is a developer tool with deeper technical output (SANs, key strength, chain depth), severity-aware exit codes for CI/scripting, and an npm CLI. If you want set-and-forget email expiry alerts, sslchecker.com is purpose-built. If you want technical cert inspection in a browser or terminal with scripting support, voiddo sslcheck fits better.
What are Subject Alternative Names (SANs)?
SANs are the list of hostnames a TLS certificate is valid for. A wildcard cert like *.example.com covers all one-level subdomains. voiddo sslcheck shows the full SAN list so you can verify a certificate covers the exact hostname you need — useful for diagnosing SSL handshake errors from hostname mismatches.
Can I use voiddo sslcheck in CI pipelines?
Yes. The npm CLI returns severity-aware exit codes: 0 for valid, 1 for warning (expiry approaching your threshold), 2 for critical (expired or very close to expiry). Add it to GitHub Actions or cron to fail a build or alert when a cert is about to expire:
npx @v0idd0/sslcheck api.yoursite.com --warn-days 30 --crit-days 7What TLS details does voiddo sslcheck report?
voiddo sslcheck reports: issuer name and organisation, subject CN and SANs list, valid-from and valid-until dates, days until expiry with severity badge, public key algorithm (RSA/ECDSA) and key size in bits, certificate chain depth, and overall status (valid/warning/critical). For full handshake protocol analysis and cipher suite enumeration, use ssllabs.com.
Is voiddo sslcheck free?
Yes — completely free. The web tool has no account requirement and no rate limits on normal use. The npm CLI is MIT-licensed. It is part of the 50+ free developer tools at tools.voiddo.com.