Best API Clients in 2026
Updated
In short: Postman is ranked #1 of 38 as of 5 October 2026, ahead of Apidog and Testfully. The best-ranked option with a free plan is Apidog. The lowest first paid tier on this page is Thunder Client at $3/mo.
API clients give you a way to send requests, inspect responses and work with API specifications. Compare API documentation and automated test runs, then check GraphQL, gRPC and WebSocket support for the protocols in your workflow. Postman, Apidog and Insomnia are among the named options to consider. Available platforms and team workspaces help you assess where you can work and whether collaboration features suit your needs. The comparison also includes free-plan availability and the “Paid from” price, so you can weigh listed costs alongside capabilities. Look across those details to find differences that matter for the APIs you build, test or maintain.
38 API clients ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
38ranked
17free plans on this page
$3/molowest paid tier
5 Oct 2026last checked
Input list API clients 25 channels on this page · 109 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromGraphQL supportgRPC supportWebSocket supportAutomated test runsAPI documentationTeam workspaces Spec sheet Score
01 Postman Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 9.1
02 Apidog Free planYesPaid from$9/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 3/8spec lines stated 9.0
03 Testfully Free planYesPaid from$14/user/moGraphQL supportYesgRPC supportNoWebSocket supportNoAutomated test runsYesAPI documentationYesTeam workspacesYes 8/8spec lines stated 8.9
04 Insomnia Free planYesPaid from$12/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 3/8spec lines stated 8.7
05 Bruno Free planYesPaid from$6/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 3/8spec lines stated 8.7
06 SoapUI Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 8.4
07 Kreya Free planYesPaid from$5/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 3/8spec lines stated 8.4
08 Hoppscotch Free planYesPaid from$6/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 3/8spec lines stated 8.3
09 Firecamp Free planYesPaid from$49/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportYesAutomated test runsYesAPI documentationYesTeam workspacesYes 7/8spec lines stated 8.3
10 Altair GraphQL Client Free planYesPaid from$7.99/user/moGraphQL supportYesgRPC supportnot statedWebSocket supportYesAutomated test runsnot statedAPI documentationYesTeam workspacesYes 6/8spec lines stated 8.2
11 Requestly Free planNoPaid from$10/user/moGraphQL supportYesgRPC supportYesWebSocket supportYesAutomated test runsYesAPI documentationYesTeam workspacesYes 8/8spec lines stated 8.0
12 OpenReq Free planYesPaid fromFreeGraphQL supportYesgRPC supportNoWebSocket supportYesAutomated test runsYesAPI documentationYesTeam workspacesYes 8/8spec lines stated 8.0
13 grpcurl Free planYesPaid fromnot statedGraphQL supportNogRPC supportYesWebSocket supportNoAutomated test runsNoAPI documentationNoTeam workspacesNo 7/8spec lines stated 7.8
14 httpYac Free planYesPaid fromnot statedGraphQL supportYesgRPC supportYesWebSocket supportYesAutomated test runsYesAPI documentationYesTeam workspacesYes 7/8spec lines stated 7.6
15 Thunder Client Free planYesPaid from$3/user/moGraphQL supportnot statedgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 7.5
16 ReadyAPI Free planNoPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 7.4
17 Vegha Free planYesPaid fromnot statedGraphQL supportYesgRPC supportYesWebSocket supportYesAutomated test runsYesAPI documentationnot statedTeam workspacesNo 6/8spec lines stated 7.4
18 HTTPie Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 7.3
19 grpcui Free planYesPaid fromnot statedGraphQL supportNogRPC supportYesWebSocket supportNoAutomated test runsNoAPI documentationNoTeam workspacesNo 7/8spec lines stated 7.3
20 RESTK Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsYesAPI documentationnot statedTeam workspacesYes 4/8spec lines stated 7.1
21 Hurl Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 7.0
22 Insomnium Free planYesPaid fromnot statedGraphQL supportYesgRPC supportYesWebSocket supportYesAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 4/8spec lines stated 6.9
23 API Dash Free plannot statedPaid fromnot statedGraphQL supportYesgRPC supportNoWebSocket supportYesAutomated test runsnot statedAPI documentationYesTeam workspacesnot stated 4/8spec lines stated 6.8
24 Yaak Free planYesPaid fromnot statedGraphQL supportYesgRPC supportnot statedWebSocket supportnot statedAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 2/8spec lines stated 6.7
25 Chapar Free planYesPaid fromnot statedGraphQL supportYesgRPC supportYesWebSocket supportNoAutomated test runsnot statedAPI documentationnot statedTeam workspacesnot stated 4/8spec lines stated 6.7
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | GraphQL support | gRPC support |
|---|---|---|---|---|---|---|---|---|
| 1 | Postman | 9.1 | Free plan | $9/mo | Yes | — | Yes | — |
| 2 | Apidog | 9.0 | Free plan | $9/mo | Yes | $9/user/mo | Yes | — |
| 3 | Testfully | 8.9 | Free plan | $10/mo | Yes | $14/user/mo | Yes | No |
| 4 | Insomnia | 8.7 | Free plan | $12/mo | Yes | $12/user/mo | Yes | — |
| 5 | Bruno | 8.7 | Free plan | $6/mo | Yes | $6/user/mo | Yes | — |
| 6 | SoapUI | 8.4 | Free plan | Free | Yes | — | Yes | — |
| 7 | Kreya | 8.4 | Free plan | $5/mo | Yes | $5/user/mo | Yes | — |
| 8 | Hoppscotch | 8.3 | Free plan | $6/mo | Yes | $6/user/mo | Yes | — |
| 9 | Firecamp | 8.3 | Free plan | $4,959/mo | Yes | $49/user/mo | Yes | — |
| 10 | Altair GraphQL Client | 8.2 | Free plan | — | Yes | $7.99/user/mo | Yes | — |
| 11 | Requestly | 8.0 | No | $10/mo | No | $10/user/mo | Yes | Yes |
| 12 | OpenReq | 8.0 | Free plan | Free | Yes | Free | Yes | No |
| 13 | grpcurl | 7.8 | Free plan | Free | Yes | — | No | Yes |
| 14 | httpYac | 7.6 | Free plan | Free | Yes | — | Yes | Yes |
| 15 | Thunder Client | 7.5 | Free plan | $3/mo | Yes | $3/user/mo | — | — |
| 16 | ReadyAPI | 7.4 | No | — | No | — | Yes | — |
| 17 | Vegha | 7.4 | Free plan | Free | Yes | — | Yes | Yes |
| 18 | HTTPie | 7.3 | No | — | Yes | — | Yes | — |
| 19 | grpcui | 7.3 | Free plan | Free | Yes | — | No | Yes |
| 20 | RESTK | 7.1 | Free plan | Free | Yes | — | Yes | — |
| 21 | Hurl | 7.0 | No | — | Yes | — | Yes | — |
| 22 | Insomnium | 6.9 | No | — | Yes | — | Yes | Yes |
| 23 | API Dash | 6.8 | No | — | — | — | Yes | No |
| 24 | Yaak | 6.7 | No | $6.58/mo | Yes | — | Yes | — |
| 25 | Chapar | 6.7 | No | — | Yes | — | Yes | Yes |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which API client is ranked first on Specifiction?
Postman is ranked #1 of 38 with a score of 9.1. Apidog is second and Testfully third.
How many of these have a free plan?
17 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Thunder Client has the lowest first paid tier we found: $3/mo.
How is this list 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.
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