Testfully
8.2#4 in api clientsFrom $10 a monthFree planWebExtensionLinuxmacOS
VisitTestfully vs WhoisJSON API
WhoisJSON API
7.1#17 in api clientsFrom $10 a monthFree planWebAPILinuxmacOS
VisitWhat both publish
| Fact | Testfully | WhoisJSON API |
|---|---|---|
| API documentation | Yes | Yes |
| Free plan | Yes | Yes |
| Integrations | SSO integrations include Ping Identity, Microsoft Entra ID, Okta, Google and GitHub; alerting integrations include Slack and PagerDuty. | Official clients are listed for PHP, Python 3.7+, and Node.js, and the MCP server is described as compatible with Claude, Cursor, and Windsurf. |
| Product | Testfully is a fully automated API testing and monitoring platform. | WhoisJSON provides a REST API for WHOIS, DNS, SSL certificate, domain availability, email domain intelligence, subdomain discovery, and monitoring lookups. |
| Support | The Team and Enterprise plans include priority support, and the FAQ offers onboarding sessions through [email protected]. | The API documentation says the support team typically responds within a few hours. |
Testfully plans
- Developer EditionFree
- Team Edition$14 a month
- Enterprise Edition$29 a month
- Team Edition$168 a year
- Enterprise Edition$348 a year
- API Monitoring Credits 10K$10 a month
WhoisJSON API plans
- BasicFree
- Pro$10 a month
- Ultra$30 a month
- Scale$50 a month
- Mega$80 a month
- Giga$120 a month
Pick Testfully if…
Testfully suits software engineers, DevOps engineers and testers who need to create API checks or monitor API runs. Its workspaces and team controls may suit teams collaborating on API requests.
Pick WhoisJSON API if…
You want what its maker publishes above — check its page for the details.