Open source Paw alternatives
Every project in the catalog is MIT, Apache or BSD licensed. 0 projects explicitly describe themselves as a Paw alternative; 22 more are in the category where Paw is a typical product.
Open source projects in the same category: API Testing & Mocking
Category-level information: these projects are the same kind of software as Paw; they have not claimed to be a one-to-one replacement.
Hoppscotch
100hoppscotch · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- Using HTTP methods, you send requests to API endpoint and analyze responses.
- You exchange real-time data through protocols such as WebSocket, Socket.IO and MQTT.
- You create code snippets for requests, import cURL commands, and convert requests into shareable connections.
- • High number of open issues (885)
- • NeutralHacker News
Hoppscotch: Open-source alternative to Postman
“Had a similar issue. You have to use their browser extension: . Click on this extension and add the domain you want to query. Then on Hoppscotch, go to settings and click "use browser extension to send requests." I was using Altair's desktop app to handle CORS, but may switch to…”
- • NeutralHacker News
Hoppscotch: Open-source alternative to Postman
“For those who have no idea what Postman and Hoppscotch are even after clicking the link: > "Hoppscotch is a ... web based API development suite. It was builtb ... with ease of use and accessibility in mind ... free-to-use ... Open Source”
Verified against README · Oct 26, 2026 · source
Insomnia
100Kong · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- Using popular protocols and formats, you debug API
- Design API with local OpenAPI editor
- Imitate API with cloud or your own hosted server
- • High number of open issues (916)
- ↓ NegativeHacker News
Insomnia 3.0 – A simple and beautiful REST API client
“I've used Insomnia in the past when I was evaluating various REST clients. At the time I was using mainly Burp and sometimes Postman. I did not stick to it mainly because I could not find some features that I needed for my work. From what I can see on the website, the new update…”
- ↑ PositiveHacker News
Insomnia 3.0 – A simple and beautiful REST API client
“I cannot agree more on this :) The first time I saw Insomnia last year, I found it already very well designed. It had a smooth UX on most basic actions and, I have to say, a fun use of the ".rest" domain name! I'm the founder of Paw and I can safely say that building a good UI…”
Verified against README · Oct 26, 2026 · source
Swagger UI
100swagger-api · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You use the traditional npm module for dependency management in single-page applications
- With automated interactive documentation from the OpenAPI definition, you visualize and try API resources from the browser.
- Integrate the Swagger UI component package into your project to integrate into React applications
- • High number of open issues (1,158)
- • NeutralHacker News
Show HN: A faster way to prototype your APIs using OpenAPI 3 and Swagger UI
“Hello. Yes, I have not prepared enough the description so guys and ladies I am sorry for that. Just added more information to the README.md file on GitHub. Answers to the questions: > - Read application code (written in python?) and extract an API specification? Is it flask…”
- • NeutralHacker News
Show HN: A faster way to prototype your APIs using OpenAPI 3 and Swagger UI
“As other mentioned this the description is particularly non-user friendly for something that (as far as I understood) is related to a documentation management system. I'm mostly a backend GUI but still interested in learning more about web API. But the only description sentence…”
Verified against README · Oct 25, 2026 · source
OpenAPITools · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You automatically create API client libraries and SDK from the OpenAPI specification.
- You can generate server templates and documentation that match the API specifications defined.
- You generate additional outputs from the same specification, such as the GraphQL scheme, the Postman collection, the Protocol Buffer or the MySQL scheme.
- • High number of open issues (5,826)
Verified against README · Oct 26, 2026 · source
keploy
100keploy · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You can create automated tests and mockups by recording actual user traffic in your application.
- You can set up isolated testing environments by virtualizing complex infrastructure components such as database and message queue.
- By integrating into the CI/CD processes, you can report API, integration, and end-to-end testing coverage.
- • High number of open issues (825)
- • NeutralHacker News
Keploy – Traffic-Based Automated API Test Generator
“A tool for developers that automatically generates APIs and integration tests from actual user traffic Running with keploy record without code modification captures network-level traffic with eBPF to generate tests and mocks. You can record API calls, DB queries, streaming…”
posting
95darrenburns · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You can create and manage HTTP requests using the SSH connection via the terminal.
- You can import existing configurations in Postman or OpenAPI format.
- You can define custom Python codes that will run before and after the request.
- • NeutralHacker News
Ask HN: Please restrict new accounts from posting
“I've been a long-time HN lurker. Like many others, I never created an account to participate and mostly just read without posting. Today, for the first time, I actually have something I'd like to contribute: a personal open-source project I built with the community in mind and…”
- • NeutralHacker News
Ask HN: Please restrict new accounts from posting
“I understand that something needed to be done. Still can't help but say that it's a pity. A blanket ban on new users posting doesn't seem right. There are many people like me who "followed" HN for a long time, but then decided to create an account recently to post and ask for…”
resty
100go-resty · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- In Go projects, you communicate with HTTP and REST based services.
- In your Go application, you listen to the stream of events from the server as a SSE (Server-Sent Events) client.
- You manage your dependencies through semantic versioning support.
- • NeutralHacker News
Resty - a bash REST client
“Its error handling is a little odd, and it doesn't detect unexpected commands. $ resty 42; echo $? resty: curl returned error 42 0 $ (curl was never called.)”
- • NeutralGitHub Issue
Collecting Inputs for Resty v2.0 and Plan the release
“The goal of this thread to collect feedback's from `resty` users and `plan v2.0.0` release. Action items get recorded here #167. - Things could be improved - Things could be added (generalized one's not specific use case) - Things could be removed Share your resty experiences…”
Verified against README · Oct 25, 2026 · source
karate
80karatelabs · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You perform API testing, mock creation, performance testing, and interface automation in a single frame.
- Using documentation links, you access guides and release notes.
- You follow the version development processes through v2 module descriptions and transition notes.
- • NeutralHacker News
Effort shock: how the Karate Kid ruined the modern world
“I like this article; the message really resonates with me. For instance, I write music. But a good three minute song could take me days to write (and most musical artists usually take way longer than that). I like to animate, but a minute of animation could take even longer than…”
- • NeutralHacker News
Effort shock: how the Karate Kid ruined the modern world
“I don't entirely agree with the author. It all depends on how you interpret the films. For me, the karate kid did not make expertise in karate look easy, but simply possible. It is important for people to realize that, given the appropriate training system, they can achieve…”
Mockoon
100mockoon · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- With the desktop application, you define an unlimited number of local mock servers and routes
- Thanks to the CLI tool you run it in fake API CI environments and headless systems
- You test error scenarios by examining records and logs of incoming and directed requests
- • NeutralHacker News
Show HN: Mockoon – mock REST APIs in seconds
“Hi! I created this new desktop app (made with Electron) to easily mock REST APIs locally. It's available for Windows / Linux / OSX and still in beta but with lots of features and a lot more to come. I developed it for my colleagues and me to help us easier the process of working…”
- • NeutralHacker News
Show HN: Mockoon – mock REST APIs in seconds
“Raccoon and "Coon" are very different things. Being said Mockoon doesn't actually make that much sense, raccoons aren't known for mocking. Mockingbirds are, perhaps "Mockingbird"? MockBird? I'm sure you'll figure it out.”
xh
80ducaale · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You send the target URL HTTP requests from the command line.
- You automatically serialize data items as JSON objects from the command line.
- You install the tool through different operating systems and package managers.
WireMock
95wiremock · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- URL, according to header and body content patterns HTTP responses stub
- Confirms the compliance of incoming requests to criteria and adds response delays
- By isolating third-party services, you simulate API that doesn't exist yet.
- • High number of open issues (501)
- ↓ NegativeHacker News
WireMock
“More generally, it's useful for mobile development in the following scenarios: * The back-end API you depend on isn't ready yet * The back-end test server is slow, flakey etc. * You want to test scenarios you can't easily make happen on demand like slow responses, 503 errors,…”
- ↑ PositiveHacker News
WireMock
“I used WireMock extensively in a recent project that had a dependency on flaky REST API. Using the proxy/recording feature to quickly get some canned responses from the dependency allowed us to perform integration testing even though the dependency was frequently down...we…”
rest-assured · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- By making GET or POST requests, you verify JSON and XML responses with path statements within the body.
- You send requests by adding parameters and check specific text or XPath matches in the response body
- You write access tests to protected endpoint using basic authentication mechanisms
- • High number of open issues (549)
- • NeutralGitHub Issue
The import io.restassured.RestAssured cannot be resolved
“Hi Johan, I am getting the red squiggly lines when I use the below static imports: ` import static io.restassured.RestAssured.*; import static io.restassured.matcher.RestAssuredMatchers.*; ` My POM. xml has the below dependencies: io.rest-assured rest-assured 3.0.3 test…”
- ↑ PositiveGitHub Issue
Cannot compare Long values within body
“As already faced in a body element cannot be compared to a long value. I think the best solution could be to allow function passing (as for headers) in order to convert the value to a long. E.g: ``` java long expected = 1L; when().get("/test/{id}", expected).…”
Gatling
100gatling · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- Using Java, JavaScript, TypeScript, Kotlin, or Scala languages, you define performance tests as code.
- By integrating performance tests into the CI/CD processes, you perform automatic regression checks prior to distribution.
- Using protocols such as HTTP, WebSocket, gRPC and MQTT, you simulate the system's behavior under load.
- ↓ NegativeGitHub Issue
Cookie support doesn't work properly
“We had an issue with that and had to change it manually. In our case, the application send a jSessionId even if the user is not authenticated. A new one is sent when the user authenticate and it wasn't took by Gatling so we were always "unauthenticated". Actually, the first SET…”
- ↑ PositiveGitHub Issue
Multiple gatling runs in single jenkins job?
“I'd previously asked about this an in issue filed against the gatling jenkins plugin project. It would be awesome if the Gatling jenkins plugin could find and archive multiple gatling reports from an individual jenkins build run, and graph them against one another in the trend…”
Huachao · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- Within the editor, you send HTTP requests and display responses in a separate panel with syntax highlighting.
- You write multiple requests in a single file using the '###' separator and run them separately.
- You provide authentication with methods such as basic authentication, Digest, AWS signature v4 and Azure Active Directory.
- • High number of open issues (592)
- • NeutralGitHub Issue
Connection is being rejected for localhost
“Expectation: If I specify "localhost" in the host address the request should not change to "127.0.0.1". Some web servers (in this case II Express) do not recognize 127.0.0.1. The server gets the request but is not be able to map against the correct web application. Symptom:…”
- • NeutralGitHub Issue
Others enhancements
“- VSCode Version: 1.3 - OS Version: Win 7 I don't know if it's better to create different issue but here is some proposition and sorry for the english :). Enhancement : - [x] Create a new document with the response content to avoid the white background. To be homogeneous with…”
cypress-io · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You can try end-to-end tests and Cypress methods on this application.
- You can review local authentication and database seeding processes.
- With example user data, you can run the application in the local environment.
- • NeutralGitHub Issue
Unable to Run on Windows
“1. Cloned the repository 2. ran yarn install 3. On running yarn start i got the below error: `$ cp data/database-seed.json data/database.json 'cp' is not recognized as an internal or external command, operable program or batch file.` 4. Changed the cp commands to copy so they…”
Prism
100stoplightio · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- From any API specification document, you launch close-to-fact mock servers.
- Using the verification proxy command, you control the incompatibility between your API application and the OpenAPI document.
- You use a verification proxy so that API consumers and developers can perform contract testing.
- • NeutralHacker News
Prism
“We used to have “SEO spam”, where people would try to create news (and other) articles associated with some word or concept to drown out some scandal associated with that same word or concept. The idea was that people searching on Google for the word would see only the newly…”
- • NeutralHacker News
Prism
“Prism in tech is very well-known to be a surveillance program. Coming from a company involved with sharing data to intelligence services (it's the law you can't escape it) this is not wise at all. Unless nobody in OpenAI heard of it. It was one of the biggest scandal in tech 10…”
Azure · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- Using OpenAPI specifications, you create REST API client libraries.
- You generate code for a variety of languages such as C#, Java, Python, and TypeScript.
- You automate client codes that provide access to web services.
- • NeutralHacker News
AutoRest: OpenAPI Specification code generator
“I asked the HN community for feedback on using Swagger Codegen, AutoRest last year: They're essentially the same but written in different languages (Java vs C#/TypeScript). Eventually we picked Swagger Codegen due to its active community and wide-range of supported…”
- • NeutralHacker News
Ask HN: Compare AutoRest, Apimatic and Swagger Codegen
“I've worked on generating SDK's for a small startup last summer. I haven't tried AutoRest but I dabbled with ApiMatic and Swagger and ultimately went with Swagger. The biggest thing for me was that, while ApiMatic has a lot of really nice tools and options, I couldn't find any…”
Dredd
10apiaryio · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You can verify whether your API documentation is compatible with actual application responses.
- You can customize test installations by typing hook codes in different programming languages.
- You can automatically test API definitions on various continuous integration systems.
- • Repository is archived (no longer maintained)
- • Last update 2 years ago
- • NeutralGitHub Issue
Update dredd to support nullable attribute
“Dredd should properly test against the new `nullable` attribute supported by MSON and drafter. md `+ s1 (string, nullable)` json `{"s1":null}` I can help with this however I am not 100% sure if I need to make changes to drafter.js or protagonist? Thanks.”
schemathesis · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- You test API by generating automatic inputs from OpenAPI or GraphQL schemes.
- By connecting operations in realistic workflows, you detect conditional errors.
- You run adaptive tests that learn restrictions and authentication information in server responses.
- ↓ NegativeGitHub Issue
[BUG] performance improvements for large APIs?
“### Checklist - [x] I checked the [FAQ section]( of the documentation - [x] I looked for similar issues in the [issue tracker]( - [x] I am using the latest version of Schemathesis ### Describe the bug I'm currently running the tool for a large-ish API description, about 220…”
unkn0wn-root · API Testing & Mocking
Common commercial products in this category: Postman, Insomnia, Paw
- İstekleri düz .http dosyalarında yazıp git ile sürümleyebilirsin.
- Bearer, OAuth 2.0 (PKCE dahil) ve gh auth token gibi CLI token'larıyla kimlik doğrulayabilirsin.
- @capture, @assert, @poll ve @retry ile yanıtları doğrulayan senaryolar yazabilirsin.
- • NeutralGitHub Issue
Using the -from-openapi flag, resterm complains about a schema inside a schema component
“I have the following component inside components -> schemas: ```yaml anObject: description: Annotation Object type: object schema: type: object properties: id: type: integer highlight_id: type: integer content: type: string required: ["id", "highlight_id", "content"]…”
- ↑ PositiveGitHub Issue
Use token from CLI command
“Some CLI tools have a command to generate and print an auth token. One example is the [GitHub CLI]( You run `gh auth login` to log in and then `gh auth token` will print the token to stdout. I would like to have some kind of global var like `# @auth bearer {{token}}` but provide…”
Verified against README · Oct 29, 2026 · source