toolgrep / Security / HTTP Observatory
Alternatives to HTTP Observatory
HTTP Observatory: HTTP header security test by Mozilla. 8 products similar to HTTP Observatory, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 2 of 8 have an API, 1 of 8 offers an MCP server.
- WebSitePulse
Website and server monitoring with free test tools
- CORS Tester
Check whether an API's CORS response headers permit a frontend to read a response, with preflight and HTTP status reported separately.
- HostedScan
Online vulnerability scanning platform
- Test TLS
Test a TLS server on any port
- CertObserver
Certificate Transparency search with grouped results
- SSL Server Test
Free online SSL test for public web servers
- OpenWebhook
Free online webhook tester and inspector that relays HTTP requests to your browser in real time.
- DJ Checkup
Check your Django site for security errors
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| HTTP Observatory | Free | yes | — | — | — | — |
| WebSitePulse | Freemium · from 3.00 | yes | — | no | — | no |
| CORS Tester | Free | yes | no | no | no | — |
| HostedScan | Freemium · from $39 | yes | yes | no | no | no |
| Test TLS | Free | yes | — | no | — | — |
| CertObserver | Freemium · from $9/month | yes | no | no | no | no |
| SSL Server Test | Free | yes | — | no | — | — |
| OpenWebhook | Freemium | yes | yes | yes | no | — |
| DJ Checkup | 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/http-observatory/alternatives