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 many 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, soapUI and Advanced REST Client.

filter to find the best alternatives

Postman alternatives are mainly API Clients but may also be HTTP Clients or HTTP(S) Debuggers. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Postman.

169

API Client
Freemium • Proprietary

...

Postman is a tool that facilitates the development and use of APIs. Postman provides all the functionality needed to create or simulate API specifications and use the Postman Collection Runner to create tests.

More about Postman

More about Postman

Postman alternatives page was last updated Sep 17, 2024

Insomnia REST Client
A powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.
71 Insomnia REST Client alternatives
License model
- Freemium • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Mac
- Windows
- Linux
- Flathub
- Flatpak
+2
Insomnia REST Client Features
1. Lightweight
2. Request Chaining
3. Import Curl commands
4. REST API
5. REST Client
6. GraphQL
7. Cloud Sync
8. Support environment variables
9. API Management
10. Separated workspaces
Show all NaN Insomnia REST Client features ▾
Insomnia REST Client VS Postman
Is Insomnia REST Client a good alternative to Postman?
Comments about Insomnia REST Client as an Alternative to Postman

Julian Garner
Compared to postman this is definitely better the UI is less cluttered there's Linux support, and it just looks nicer.
Top positive comment •May 23, 2021
4
dax0
Very similar to Postman, but doesn't require logging in for basic features. So useful for some quick testing.
Top positive comment •Aug 26, 2023
0
Guest
It's not lightweight, because still uses Electron and not native, so consuming memory alot
Top negative comment •Aug 28, 2021
6
scottfrost
Many of the same features as Postman, but no sync unless you pay. This is a deal breaker to developers who work on multiple computers, like home & work PCs.
Negative comment •Dec 16, 2020
-5
nassyma
Full featured, open source, freemium
Positive comment •Aug 27, 2020
4
Show more comments
5 of 19 comments
- Almost everyone thinks Insomnia REST Client is a great Postman alternative.
- Insomnia REST Client is the most popular Windows, Mac & Linux alternative to Postman.
- Insomnia REST Client is the most popular Open Source & free alternative to Postman.
- 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
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...
30 HTTPie for Terminal alternatives
License model
- Free • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Mac
- Windows
- Linux
- Python
- FreeBSD
HTTPie for Terminal Features
1. Command line interface
2. Lightweight
3. REST API
4. Web Testing
5. API Management
Show all NaN HTTPie for Terminal features ▾
HTTPie for Terminal VS Postman
Is HTTPie for Terminal a good alternative to Postman?
Comments about HTTPie for Terminal as an Alternative to Postman

scottfrost
Update to the (only) negative comment. The UI is now free (price) but closed source.
Positive comment •Jun 5, 2023
1
Blue Paint
Can be launched without internet connection (useful in cases of restrictive VPN policy)
Positive comment •Feb 6, 2024
0
Leonardo Colman
HTTPie doesn't contain an interface. The current UI is closed behind a private beta.
Negative comment •Jun 22, 2022
-2
- 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
Hoppscotch is an open-source API development ecosystem. It helps you create your requests faster, saving you precious time on your development.
60 Hoppscotch alternatives
License model
- Free • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Online
- Self-Hosted
Hoppscotch Features
1. REST API
2. Ad-free
3. GraphQL API
4. Websocket streams
5. Command line interface
6. Portable
7. Lightweight
8. Cross browser testing
9. Browser-based
Show all NaN Hoppscotch features ▾
Hoppscotch VS Postman
Is Hoppscotch a good alternative to Postman?
Comments about Hoppscotch as an Alternative to Postman

Max Fisher
AFAIK, doesn't have a feature to import cURL from clipboard.
Negative comment •Sep 12, 2024
0
Guest
Helps you create your requests faster, saving you precious time on your development
Positive comment •Oct 29, 2019
3
- Most users think Hoppscotch is a great Postman alternative.
- Hoppscotch is the most popular Web-based & Self-Hosted alternative to Postman.
- Hoppscotch is Free and Open SourcePostman is Freemium and Proprietary
- Hoppscotch is LightweightPostman is not according to our users

soapUI
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.
72 soapUI alternatives
License model
- Free • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Mac
- Windows
- Linux
+1
soapUI Features
1. Portable
2. Ad-free
3. Command line interface
4. Lightweight
5. Intuitive Nodes
Show all NaN soapUI features ▾
soapUI VS Postman
Is soapUI a good alternative to Postman?
Comments about soapUI as an Alternative to Postman

DiskCrasher
Can create a mock server for free.
Positive comment •Sep 29, 2023
0
- 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
API testing tool. Which allows web developers to create and test custom HTTP requests.
61 Advanced REST Client alternatives
License model
- Free • Open Source
Application types
- HTTP Client
- API Client
Platforms
- Mac
- Windows
- Linux
- Chrome OS
- AppImageHub
- Google Chrome
- Chromium
Advanced REST Client Features
1. Full headers control
2. Electron based
3. Web tool
4. REST API
5. Sync with Google Drive
6. REST Client
7. API Testing
Show all NaN Advanced REST Client features ▾
Discontinued
The latest version (17.0.9) is from March 2022.
Advanced REST Client VS Postman
Is Advanced REST Client a good alternative to Postman?
Comments about Advanced REST Client as an Alternative to Postman

patheticcockroach
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)
Positive comment •Dec 17, 2019
2
blur HY
It has all features postman has, and it's modern
Positive comment •Sep 14, 2019
3
Guest
The import request are so bad
Negative comment •Aug 12, 2020
0
- Most users think Advanced REST Client is a great Postman alternative.
- Advanced REST Client is Free and Open SourcePostman is Freemium and Proprietary

Bruno
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.
21 Bruno alternatives
License model
- Freemium • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Mac
- Windows
- Linux
- Flathub
Bruno Features
1. Lightweight
2. Works Offline
3. Portable
4. REST API
5. Ad-free
6. Git Support
7. Command line interface
Show all NaN Bruno features ▾
Bruno VS Postman
Is Bruno a good alternative to Postman?
Comments about Bruno as an Alternative to Postman

Guest
Postman shut off his local client and forces you now to store your data in their cloud, also running your requests through their proxy.

It also is quite a mess to colaborate on postman colections, if you don't want to use / pay for their cloud.

With Bruno all that is not an issue at all - they work in a way which comes very natural to a developer and you can perfectly integrate your api test collections to your code repository.
Positive comment •Nov 2, 2023
2
Blerkotron
Lightweight, portable, very familiar UI for ex-Postman users.
Positive comment •Feb 13, 2024
1
- Bruno is Freemium and Open SourcePostman is Freemium and Proprietary
- Bruno is LightweightPostman is not according to our users

Insomnium
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.
17 Insomnium alternatives
License model
- Free • Open Source
Application types
- API Client
- HTTP Client
Platforms
- Windows
- Linux
- Mac
Insomnium Features
1. REST Client
2. Command line interface
3. GraphQL API
4. Lightweight
5. Ad-free
6. Local Storage
7. REST API
Show all NaN Insomnium features ▾
Discontinued
The GitHub repository was archived in May 2024.

Insomnium VS Postman
Is Insomnium a good alternative to Postman?

7 of 45 Postman alternatives