toolgrep / Security / CertObserver
Alternatives to CertObserver
CertObserver: Certificate Transparency search with grouped results. 8 products similar to CertObserver, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 6 of 8 have an API, 2 of 8 offer an MCP server.
- CertPost
SSL certificate monitoring for teams and agencies
- GitGuardian
Credential layer security platform for detecting, remediating, and preventing leaked secrets and machine identities.
- WebSitePulse
Website and server monitoring with free test tools
- Let's Encrypt
Free, automated TLS certificate authority
- inspect.software
A public record of open-source software health
- Tesults
Consolidated test reporting and release readiness platform
- Checkly
The active reliability layer for developers & agents
- CORS Tester
Check whether an API's CORS response headers permit a frontend to read a response, with preflight and HTTP status reported separately.
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| CertObserver | Freemium · from $9/month | yes | no | no | no | no |
| CertPost | Freemium · from $0 | yes | yes | no | no | no |
| GitGuardian | Freemium | yes | yes | no | no | no |
| WebSitePulse | Freemium · from 3.00 | yes | — | no | — | no |
| Let's Encrypt | Free | yes | yes | no | no | — |
| inspect.software | Freemium | yes | yes | no | no | no |
| Tesults | Freemium | yes | yes | yes | yes | no |
| Checkly | Freemium | yes | yes | yes | yes | no |
| CORS Tester | Free | yes | no | no | no | — |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
API
curl https://toolgrep.com/api/products/certobserver/alternatives