The Best Open Source Postman AlternativesTop API & HTTP Clients like Postman

The best open source alternative to Postman is Insomnia REST Client. If that doesn't suit you, our users have ranked more than 50 alternatives to Postman and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Postman are HTTPie for Terminal, Hoppscotch, Bruno and soapUI.

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Postman alternatives are mainly API Clients, but if you're looking for HTTP Clients or Web Testing Tools you can filter on that. Other popular filters include Open Source, Web Development, Linux, Online, Mac, Android and API Client. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Postman.

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Postman alternatives page was last updated Jan 22, 2026

Insomnia REST Client
145 likes
A powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.
83 Insomnia REST Client alternatives
Cost / License
Freemium
Open Source (Apache-2.0)
Application type
API Client
Origin
United States
Platforms
Mac
Windows
Linux
Flathub
Flatpak
+2
Is Insomnia REST Client a good alternative to Postman?

|
20comments
175users say it's a good alternative
Comments about Insomnia REST Client as an Alternative to Postman

Top Positive Comment
dax0
Aug 26, 2023
1
Very similar to Postman, but doesn't require logging in for basic features. So useful for some quick testing.
Top Negative Comment
Guest
Aug 28, 2021
7
It's not lightweight, because still uses Electron and not native, so consuming memory alot
Review by a new / low-activity user.
AdinanCenci
Negative commentFeb 11, 2025
0
used to like it, now it is as garbage as postman
3 of 20 comments
Almost everyone thinks Insomnia REST Client is a great Postman alternative.
Insomnia REST Client is Freemium and Open SourcePostman is Freemium and Proprietary
Insomnia REST Client is LightweightPostman is not according to our users
HTTPie for Terminal
57 likes
HTTPie (pronounced aitch-tee-tee-pie) is a command line HTTP client. Its goal is to make CLI interaction with web services as human-friendly as possible. It provides a simple http command that allows for sending arbitrary HTTP requests using a simple and natural syntax, and...
36 HTTPie for Terminal alternatives
Cost / License
Free
Open Source (BSD-3-Clause)
Application type
API Client
Origin
United States
Platforms
Mac
Windows
Linux
Python
FreeBSD
Is HTTPie for Terminal a good alternative to Postman?

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3comments
39users say it's a good alternative
Comments about HTTPie for Terminal as an Alternative to Postman

scottfrost
Positive commentJun 5, 2023
1
Update to the (only) negative comment. The UI is now free (price) but closed source.
Blue Paint
Positive commentFeb 6, 2024
0
Can be launched without internet connection (useful in cases of restrictive VPN policy)
Leonardo Colman
Negative commentJun 22, 2022
-2
HTTPie doesn't contain an interface. The current UI is closed behind a private beta.
Most users think HTTPie for Terminal is a great Postman alternative.
HTTPie for Terminal is Free and Open SourcePostman is Freemium and Proprietary
HTTPie for Terminal is LightweightPostman is not according to our users
Hoppscotch
41 likes
Hoppscotch is an open-source API development ecosystem. It helps you create your requests faster, saving you precious time on your development.
67 Hoppscotch alternatives
Cost / License
Free
Open Source (MIT)
Application type
API Client
Origin
United States
Platforms
Online
Self-Hosted
Is Hoppscotch a good alternative to Postman?

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3comments
39users say it's a good alternative
Comments about Hoppscotch as an Alternative to Postman

notPlancha
Positive commentApr 8, 2025
0
Completely free, no account needed for anything, can be used on browser and even offers proxy
Guest
Positive commentOct 29, 2019
3
Helps you create your requests faster, saving you precious time on your development
Review by a new / low-activity user.
Max Fisher
Negative commentSep 12, 2024
-1
AFAIK, doesn't have a feature to import cURL from clipboard.
Most users think Hoppscotch is a great Postman alternative.
Hoppscotch is Free and Open SourcePostman is Freemium and Proprietary
Hoppscotch is LightweightPostman is not according to our users
Bruno
45 likes
Bruno is a new and innovative open source API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.
32 Bruno alternatives
Cost / License
Freemium
Open Source (MIT)
Application type
API Client
Origin
United States
Platforms
Mac
Windows
Linux
Snapcraft
Flathub
Visual Studio Code
Is Bruno a good alternative to Postman?

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5comments
11users say it's a good alternative
Comments about Bruno as an Alternative to Postman

Top Positive Comment
Port5000
Apr 3, 2025
1
Lightweight, runs on local, extremely simple and easy to use, enough to test APIs and it even exports to Postman!
jarne
Positive commentMar 12, 2025
1
Best alternative to Postman in my opinion, open source and lightweight, easy to use, and the ability to import existing Postman collections. A nice bonus that you can easily commit Bruno files to Git.
Review by a new / low-activity user.
Ola Johansson
Positive commentOct 22, 2024
0
Looks nice, and like the simplicity with data just stored in a folder and you can sync it with git or Dropbox or whatnot.
3 of 5 comments
Almost everyone thinks Bruno is a great Postman alternative.
Bruno is Freemium and Open SourcePostman is Freemium and Proprietary
Bruno is LightweightPostman is not according to our users
soapUI
59 likes
Eviware, the maker of soapUI, Web Service Testing Leader

soapUI is a tool for functional testing, mainly of web services like SOAP based web services and RESTful web services, but also HTTP based services and JMS Services as well as databases. soapUI is an open source and compl.
79 soapUI alternatives
Cost / License
Free
Open Source
Application type
API Client
Origin
United States
Platforms
Mac
Windows
Linux
+1
Is soapUI a good alternative to Postman?

|
1comment
40users say it's a good alternative
Comments about soapUI as an Alternative to Postman

DiskCrasher
Positive commentSep 29, 2023
0
Can create a mock server for free.
Most users think soapUI is a great Postman alternative.
soapUI is Free and Open SourcePostman is Freemium and Proprietary
soapUI is LightweightPostman is not according to our users
Advanced REST Client
27 likes
API testing tool. Which allows web developers to create and test custom HTTP requests.
Cost / License
Free
Open Source
Application type
API Client
Origin
Poland
EU
Alerts
Discontinued
Platforms
Mac
Windows
Linux
Chrome OS
AppImageHub
Google Chrome
Chromium
Is Advanced REST Client a good alternative to Postman?

|
3comments
23users say it's a good alternative
Comments about Advanced REST Client as an Alternative to Postman

patheticcockroach
Positive commentDec 17, 2019
2
Better features than Postman for my use case: I need full control over the headers, including the ability to remove them all, something which Postman doesn't allow to do (they add tons of junk headers)
blur HY
Positive commentSep 14, 2019
3
It has all features postman has, and it's modern
Guest
Negative commentAug 12, 2020
0
The import request are so bad
Review by a new / low-activity user.
Most users think Advanced REST Client is a great Postman alternative.
Advanced REST Client is Free and Open SourcePostman is Freemium and Proprietary
Yaak
18 likes
The API client for modern developers. Call REST, GraphQL, and gRPC APIs from a simple and intuitive app.
Cost / License
Free Personal
Open Source (MIT)
Application type
API Client
Origin
Canada
Platforms
Mac
Windows
Linux
+1
Is Yaak a good alternative to Postman?
Insomnium
16 likes
Insomnium is a fast local API testing tool that is privacy-focused and 100% local. For testing GraphQL, REST, WebSockets and gRPC. This is a fork of Kong/insomnia.
Cost / License
Free
Open Source (MIT)
Application type
API Client
Origin
International
Alerts
Discontinued
Platforms
Mac
Windows
Linux
Is Insomnium a good alternative to Postman?
Requestly
32 likes
Requestly is a lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc.
31 Requestly alternatives
Cost / License
Freemium
Open Source
Application type
HTTP(S) Debugger
Origin
United States
Platforms
Mac
Windows
Linux
Online
Microsoft Edge
Google Chrome
Software as a Service (SaaS)
Selenium
Firefox
+1
Is Requestly a good alternative to Postman?

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1comment
Comments about Requestly as an Alternative to Postman

Abhishek Sachan
Positive commentJan 24, 2025
0
Requestly = Postman + Charles Proxy.
Review by a new / low-activity user.
Requestly is Freemium and Open SourcePostman is Freemium and Proprietary
Requestly is LightweightPostman is not according to our users
Roster HTTP Client
4 likes
HTTP client for GNOME featuring GTK 4 UI, organized project management, request history, secure environment variables, JavaScript scripts for preprocessing, export in cURL and more formats, syntax-highlighted response viewing, and advanced request customization.
15 Roster HTTP Client alternatives
Cost / License
Free
Open Source (GPL-3.0)
Application type
HTTP Client
Origin
Czechia
EU
Platforms
Linux
Flathub
Flatpak
GNOME
Is Roster HTTP Client a good alternative to Postman?
Cartero
6 likes
Cartero is a graphical HTTP client that can be used as a developer tool to test web APIs and perform all kind of HTTP requests to web servers. It is compatible with any REST, SOAP or XML-RPC API and it supports multiple request methods as well as attaching body payloads to...
Cost / License
Free
Open Source (GPL-3.0)
Application type
HTTP Client
Origin
Spain
EU
Platforms
Linux
Windows
Flathub
Flatpak
Nix Package Manager
Mac
Is Cartero a good alternative to Postman?
RecipeUI
5 likes
RecipeUI is rethinking how we use API tools like Postman or Insomnia. We're starting off with TypeScript powered API requests and API collections you can run in seconds!
Cost / License
Free
Open Source (AGPL-3.0)
Application type
API Client
Alerts
Discontinued
Platforms
Linux
Mac
Windows
Is RecipeUI a good alternative to Postman?

12 of 53 Postman alternatives