Best WhoisJSON API Alternatives in 2026
Updated
20 tools from API clients ranked against WhoisJSON API on the same published basis.
- 1WhoisJSON API vs Postman
- 2WhoisJSON API vs Apidog
- 3WhoisJSON API vs Testfully
- 4WhoisJSON API vs Insomnia
- 5WhoisJSON API vs Bruno
- 6WhoisJSON API vs SoapUI
- 7WhoisJSON API vs Kreya
- 8WhoisJSON API vs Hoppscotch
- 9WhoisJSON API vs Firecamp
- 10WhoisJSON API vs Altair GraphQL Client
- 11WhoisJSON API vs Requestly
- 12WhoisJSON API vs OpenReq
- 13WhoisJSON API vs grpcurl
- 14WhoisJSON API vs httpYac
- 15WhoisJSON API vs Thunder Client
- 16WhoisJSON API vs ReadyAPI
- 17WhoisJSON API vs Vegha
- 18WhoisJSON API vs HTTPie
- 19WhoisJSON API vs grpcui
- 20WhoisJSON API vs RESTK
WhoisJSON API alternatives compared
| # | Tool | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Postman | 9.1 | Free plan | $9/mo | Browser, Linux, Mac, Web, Windows |
| 2 | Apidog | 9.0 | Free plan | $9/mo | API, Browser, Linux, Mac, self-hosted, Web, Windows |
| 3 | Testfully | 8.9 | Free plan | $10/mo | Browser, Linux, Mac, Web, Windows |
| 4 | Insomnia | 8.7 | Free plan | $12/mo | Linux, Mac, self-hosted, Windows |
| 5 | Bruno | 8.7 | Free plan | $6/mo | API, Browser, Linux, Mac, Windows |
| 6 | SoapUI | 8.4 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | Kreya | 8.4 | Free plan | $5/mo | Linux, Mac, Windows |
| 8 | Hoppscotch | 8.3 | Free plan | $6/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 9 | Firecamp | 8.3 | Free plan | $4,959/mo | Linux, Mac, self-hosted, Web, Windows |
| 10 | Altair GraphQL Client | 8.2 | Free plan | — | Browser, Linux, Mac, self-hosted, Web, Windows |
| 11 | Requestly | 8.0 | No | $10/mo | Linux, Mac, Windows |
| 12 | OpenReq | 8.0 | Free plan | Free | Browser, self-hosted, Web, Windows |
| 13 | grpcurl | 7.8 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 14 | httpYac | 7.6 | Free plan | Free | Browser, self-hosted |
| 15 | Thunder Client | 7.5 | Free plan | $3/mo | Browser, Linux, Mac, Windows |
| 16 | ReadyAPI | 7.4 | No | — | Web |
| 17 | Vegha | 7.4 | Free plan | Free | Windows, Mac, Linux |
| 18 | HTTPie | 7.3 | No | — | Web, Windows, Mac, Linux |
| 19 | grpcui | 7.3 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 20 | RESTK | 7.1 | Free plan | Free | Mac, Windows |
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Questions about WhoisJSON API alternatives
What is the best alternative to WhoisJSON API?
Postman, number 1 in API clients with a score of 9.1 out of 10. The others here: Apidog, Testfully, Insomnia and 16 more.
What is the best free alternative to WhoisJSON API?
Postman is the best-ranked alternative with a free plan. 17 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.