4
Bruno
Bruno is a Git-native API client for exploring and testing REST, GraphQL, gRPC, and WebSocket APIs.
Free planOpen sourceAPIExtensionLinuxmacOS
8.1From $6 a month
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5
Apidog
Apidog is an API platform for designing, debugging, mocking, testing, and documenting APIs, with GraphQL and SOAP support.
Free planWebAPIExtensionLinux
8.0From $9 a month
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6
Beeceptor
Beeceptor is a developer-focused API simulation platform for creating mocks, virtualizing services, testing contracts, and simulating failures.
Free planWebAPILinuxmacOS
7.9From $10 a month
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7
Testfully
Testfully is an API testing and monitoring platform with web, desktop and browser extension options.
Free planWebExtensionLinuxmacOS
7.8Free plan
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8
Postman
Postman is a platform for designing, testing, distributing, documenting, and monitoring APIs.
Free planWebExtensionLinuxmacOS
7.6From $9 a month
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9
ReadyAPI
WebAPILinuxmacOS
7.6
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10
Pact
Pact is a code-first tool for contract testing of HTTP and message integrations.
Free planAPILinuxmacOSSelf-hosted
7.5From $115.42 a month
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11
Insomnia
Insomnia is an API collaboration platform for designing, testing, debugging, mocking, and governing APIs.
Free planLinuxmacOSSelf-hostedWindows
7.2From $12 a month
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12
Kreya
Kreya is a desktop API client for exploring, testing, and automating API workflows.
Free planLinuxmacOSWindows
7.1Free plan
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13
SwaggerHub
SwaggerHub is a toolkit for API design, testing, documentation, and governance.
Free planWebSelf-hosted
7.1From $740 a year
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14
Redocly
WebAPIExtension
7.0From $10 a month
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15
Requestly
Requestly is a desktop API client with web access for building, organizing, documenting, and testing APIs.
LinuxmacOSWindows
7.0From $10 a month
Visit
16
Thunder Client
Thunder Client is a REST API client that runs inside VS Code and JetBrains IDEs.
Free planExtensionLinuxmacOSWindows
7.0From $3 a month
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17
Yaak
Yaak is a local-first desktop API client for sending requests, debugging APIs, and organizing work with Git.
Free planLinuxmacOSWindows
7.0From $79 a year
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18
Assertible
Assertible tests and monitors APIs, websites, and other HTTP services for uptime, availability, and correct behavior.
Free planWebAPI
6.9From $25 a month
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19
HTTP Toolkit
HTTP Toolkit is an open-source tool for debugging, testing, and building with HTTP.
Free planAndroidiOSWebLinux
6.9Free plan
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20
Mockoon
Mockoon is a free, open-source tool for designing and running mock APIs locally.
WebAPILinuxmacOS
6.8From €10 a month
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21
ReadMe
Free planWeb
6.7From $250 a month
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22
OpenAPI Generator
OpenAPI Generator creates API clients, server stubs, and documentation from OpenAPI 2.0 and 3.x documents.
Free planWebLinuxmacOSSelf-hosted
6.5Free plan
Visit
23
Bump.sh
Bump.sh is a paid web, API, and self-hosted service for publishing API documentation and providing MCP servers that update with API releases.
WebAPISelf-hosted
6.4From $50 a month
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24
Schemathesis
Schemathesis generates property-based tests from OpenAPI and GraphQL schemas to help engineers find API bugs.
Free planLinuxmacOSSelf-hostedWindows
6.4Free plan
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25
Stainless
Stainless generates SDKs, documentation, and MCP servers from OpenAPI specifications.
Free planWebLinuxmacOS
6.4Free plan
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26
Stoplight Elements
Free planWebSelf-hosted
6.4Free plan
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27
WireMock
WireMock simulates APIs and software dependencies, letting teams test without relying on those services, explore edge cases, and develop dependent features in parallel.
Free planWebAPILinuxSelf-hosted
6.4Free plan
Visit
28
Hurl
Hurl is a free command-line tool for running HTTP requests written in a plain-text format.
Free planLinuxmacOSSelf-hostedWindows
6.3Free plan
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29
Swagger Editor
Swagger Editor is an open-source tool for creating and documenting API definitions.
Free planWebSelf-hosted
6.2Free plan
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30
Speakeasy
Speakeasy is an AI control plane for connecting, securing, and observing agents and MCP servers from one entry point.
WebAPILinuxmacOS
5.9
Visit

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