toolgrep / Monitoring & observability / Otterwatch
Alternatives to Otterwatch
Otterwatch: Daily SSL certificate expiry monitoring with an uptime check; emails only when something changes. 8 products similar to Otterwatch, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 3 of 8 have an API, 1 of 8 offers an MCP server.
- CertPost
SSL certificate monitoring for teams and agencies
- CertObserver
Certificate Transparency search with grouped results
- WebSitePulse
Website and server monitoring with free test tools
- SubdomainWatch
Continuous attack surface monitoring and IaC guard preventing subdomain takeovers, dangling DNS records, and email hygiene flaws.
- SSL Server Test
Free online SSL test for public web servers
- Test TLS
Test a TLS server on any port
- Checkly
The active reliability layer for developers & agents
- Sucuri SiteCheck
Free website malware and security scanner
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| Otterwatch | Freemium · from $0 | yes | no | no | no | no |
| CertPost | Freemium · from $0 | yes | yes | no | no | no |
| CertObserver | Freemium · from $9/month | yes | no | no | no | no |
| WebSitePulse | Freemium · from 3.00 | yes | — | no | — | no |
| SubdomainWatch | Freemium · from £0 | yes | yes | no | no | no |
| SSL Server Test | Free | yes | — | no | — | — |
| Test TLS | Free | yes | — | no | — | — |
| Checkly | Freemium | yes | yes | yes | yes | no |
| Sucuri SiteCheck | Freemium | yes | — | 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/otterwatch/alternatives