Open source alternatives to Postman

5 projects on starwire do the same job. Ranked by how much of what Postman does each one covers, read from its README and website. Ties go to the most active.

What Postman does

Send HTTP requests and read responsescore
Saved collections of requestscore
Environments and variablescore
Scripts and automated tests
Import OpenAPI specs or curl
GraphQL, WebSocket and gRPC
Team sharing and sync
Run collections from the command line

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
hoppscotchOpen source API client for web, desktop and CLI, self-hostable	Replaces it91%	81k+48	34	9 days ago	35%	Install like an app	MIT
Covers all 3 core jobs. Partly: GraphQL, WebSocket and gRPC; Run collections from the command line.See the evidence Send HTTP requests and read responsescoreYesSend requests and get responses in real time. Saved collections of requestscoreYesKeep your API requests organized with collections and folders. Environments and variablescoreYesUnlimited environments and variables Scripts and automated testsYesPost-Request Tests Import OpenAPI specs or curlYesImport `cURL` GraphQL, WebSocket and gRPCPartlyGraphQL is a query language for APIs Team sharing and syncYesCreate unlimited shared collections Run collections from the command linePartlyWeb, Desktop & CLI
tigerGit-native API client with plain-text collections, offline use and built-in MCP	Replaces it86%	107+2	205	3 days ago	Too few	Install like an app	MIT
Covers all 3 core jobs. Partly: GraphQL, WebSocket and gRPC. Not shown: Run collections from the command line.See the evidence Send HTTP requests and read responsescoreYesfor testing REST, GraphQL and SOAP APIs Saved collections of requestscoreYesGit-native collections. Environments and variablescoreYesNamed variable sets with `{{variable}}` interpolation Scripts and automated testsYesPre-request and post-response JavaScript, with `tiger.test` assertions Import OpenAPI specs or curlYesOpenAPI 3 or Swagger 2, WSDL, or a pasted curl command GraphQL, WebSocket and gRPCPartlyREST, GraphQL and SOAP. Team sharing and syncYesshare a collection through Git with one Sync with team button Run collections from the command lineNot shownNeither the README nor the website mentions it.
brunoGit-friendly desktop API client, a lightweight alternative to Postman	Replaces it77%	48k+121	321	23 days ago	65%	Install like an app	MIT
Covers all 3 core jobs. Partly: Scripts and automated tests. Not shown: Import OpenAPI specs or curl; GraphQL, WebSocket and gRPC.See the evidence Send HTTP requests and read responsescoreYesOpensource IDE for exploring and testing APIs. Saved collections of requestscoreYesBruno stores your collections directly in a folder Environments and variablescoreYesRun a folder against a specific environment Scripts and automated testsPartlyideal for automated testing and CI/CD pipelines Import OpenAPI specs or curlNot shownNeither the README nor the website mentions it. GraphQL, WebSocket and gRPCNot shownNeither the README nor the website mentions it. Team sharing and syncYesuse Git or any version control of your choice to collaborate Run collections from the command lineYeslets you run your API collections from the command line
scalarOpen-source API client and documentation tool built on OpenAPI specs	Covers one part49%	16k+20	788	4 days ago	100%	Hosted, free plan	MIT
Covers 2 of 3 core jobs. Partly: Team sharing and sync; Run collections from the command line. Not shown: Saved collections of requests; Scripts and automated tests; GraphQL, WebSocket and gRPC.See the evidence Send HTTP requests and read responsescoreYesAn offline-first API Client built for OpenAPI Saved collections of requestscoreNot shownNeither the README nor the website mentions it. Environments and variablescoreYesHas environment variables, dynamic parameters and everything Scripts and automated testsNot shownNeither the README nor the website mentions it. Import OpenAPI specs or curlYesFirst-class OpenAPI/Swagger support GraphQL, WebSocket and gRPCNot shownNeither the README nor the website mentions it. Team sharing and syncPartlyCollaborate with your team Run collections from the command linePartlyScalar CLI \| Command-line interface
GhostmanKeyboard-driven terminal API client and webhook inspector that stays local	Same job, different way41%	154+29	15	11 days ago	Too few	Uses the terminal	MIT
Covers 2 of 3 core jobs. Partly: Team sharing and sync. Not shown: Environments and variables; Scripts and automated tests; Import OpenAPI specs or curl; GraphQL, WebSocket and gRPC; Run collections from the command line.See the evidence Send HTTP requests and read responsescoreYesSend HTTP Request Saved collections of requestscoreYesSave collections as plain files in Environments and variablescoreNot shownNeither the README nor the website mentions it. Scripts and automated testsNot shownNeither the README nor the website mentions it. Import OpenAPI specs or curlNot shownNeither the README nor the website mentions it. GraphQL, WebSocket and gRPCNot shownNeither the README nor the website mentions it. Team sharing and syncPartlycommit them to Git Run collections from the command lineNot shownNeither the README nor the website mentions it.

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