Postman Alternatives Filtered by 'Web Development'

The best alternative to Postman is Insomnia REST Client, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Postman and 12 are so hopefully you can find a suitable replacement. Other interesting alternatives to Postman are Insomnium, Reqable, TestMace and Milkman.

filter to find the best alternatives

Postman alternatives are mainly HTTP Clients, but if you're looking for API Clients or Uptime Monitor Services you can filter on that. Other popular filters include Open Source, Linux, Web Development, 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 29, 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.
94 Insomnia REST Client alternatives
Cost / License
Freemium
Open Source (Apache-2.0)
Application types
API Client
HTTP Client
Origin
United States
Platforms
Mac
Windows
Linux
Flathub
Flatpak
+2
Is Insomnia REST Client a good alternative to Postman?

|
20comments
Insomnia REST Client vs Postman Comments

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
Insomnia REST Client is Freemium and Open SourcePostman is Freemium and Proprietary
Insomnia REST Client is LightweightPostman is not according to our users
Insomnium
17 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.
31 Insomnium alternatives
Cost / License
Free
Open Source (MIT)
Application types
API Client
HTTP Client
Origin
International
Alerts
Discontinued
Platforms
Mac
Windows
Linux
Is Insomnium a good alternative to Postman?
Reqable
5 likes
Reqable is a modern cross-platform project, designed for API development, testing, and debugging. Reqable fully supports HTTP1 and HTTP2 and partially supports HTTP3(QUIC).
15 Reqable alternatives
Cost / License
Freemium
Proprietary
Application types
API Client
HTTP Client
Platforms
Mac
Windows
Linux
Android
iPhone
Android Tablet
iPad
Flathub
Flatpak
+9
Is Reqable a good alternative to Postman?
TestMace
6 likes
Powerful IDE to work with API. Harness the power of scenarios, autocompletion and syntax highlight for API development. Write tests, share code without leaving the comfortable development environment.
Cost / License
Freemium
Proprietary
Application type
API Client
Origin
United States
Platforms
Mac
Windows
Linux
+1
Is TestMace a good alternative to Postman?
Milkman
1 like
Milkman is a JavaFx-based workbench for crafting requests / responses. It is not limited to e.g. http (or more specifically rest) requests but can be extended in any imaginable way. It is optimized for fast startup and efficient workflow.
32 Milkman alternatives
Cost / License
Free
Open Source (MIT)
Application type
HTTP Client
Platforms
Mac
Windows
Linux
Is Milkman a good alternative to Postman?
EchoAPI
Like
EchoAPI is an all-in-one API development collaboration platform that offers essential features like API debugging, design, automated testing, stress testing, and documentation generation.
Cost / License
Freemium
Proprietary
Origin
United Kingdom
Platforms
Mac
Windows
Linux
Online
Google Chrome
Visual Studio Code
IntelliJ IDEA
Is EchoAPI a good alternative to Postman?
Gotcha Rest Client
1 like
Gotcha HTTP Client is a lightweight http client that allows you to make requests and inspect responses.
Cost / License
Paid
Proprietary
Application types
API Client
HTTP Client
Platforms
Mac
+4
Is Gotcha Rest Client a good alternative to Postman?
Assertible
5 likes
Assertible is the easiest way to test and monitor your APIs and helps reduce bugs in web apps by providing tools to continuously validate endpoints and responses with a flexible interface to run your tests any time and place.
Cost / License
Freemium
Proprietary
Application types
HTTP Client
Uptime Monitor
Origin
United States
Platforms
Mac
Windows
Linux
Online
+3
Is Assertible a good alternative to Postman?
R
R
restclient.el
2 likes
This is a tool to manually explore and test HTTP REST webservices. Runs queries from a plain-text query sheet, displays results as a pretty-printed XML, JSON and even images.
Cost / License
Free
Open Source
Application types
API Client
HTTP Client
Platforms
Mac
Windows
Linux
GNU Emacs
R
Is restclient.el a good alternative to Postman?
FRequest
1 like
FRequest is a fast, lightweight and opensource Windows / macOS / Linux desktop program to make HTTP(s) requests (e.g. call REST apis).
Cost / License
Free
Open Source (GPL-3.0)
Application type
HTTP Client
Platforms
Mac
Windows
Linux
+3
Is FRequest a good alternative to Postman?

|
1comment
FRequest vs Postman Comments

KaKi87
Positive commentOct 26, 2020
0
Free and open source multiplatform non-Electron app with dark theme.
FRequest is Free and Open SourcePostman is Freemium and Proprietary
Restretto
1 like
Minimal native and free REST API client for Mac.
Cost / License
Free
Proprietary
Application types
API Client
HTTP Client
Platforms
Mac
Is Restretto a good alternative to Postman?
RequestBite Slingshot
1 like
Slingshot is a web-based HTTP request client that is highly performant, low on resources, privacy respecting, local-first, free and open-source. It stores all your data locally in your browser. It allows you to import and export OpenAPI specs and Postman collections.
Cost / License
Freemium
Open Source (AGPL-3.0)
Origin
Sweden
EU
Platforms
Online
Self-Hosted
Is this a good alternative to Postman?

12 of 12 Postman alternatives