Apicat – A Lightweight Offline Postman Alternative

In plain words

Apicat is an offline API testing tool designed for developers as an alternative to Postman. It stores API requests in .http files locally, works with Git version control, and maintains compatibility with Postman projects. The open-source tool allows developers to test APIs without an internet connection and can be used free of charge.

written from the facts on this page · September 2026

From the sources

Your Own Offline Lightweight API Client. Apicat stores your .http files locally. It’s Git-friendly, open-source, and highly compatible with Postman.

Apicat is the ultimate offline Postman alternative that stores your .http files locally. It’s Git-friendly, open-source, and highly compatible with Postman. Test APIs offline with this powerful free offline API client designed for developers who need a reliable local API testing tool. No Login Required Your Data is Completely Under Your Own Control Revolutionizing the status quo represented by tools like Postman and Insomnia. Experience the freedom of an offline API tester that puts you in complete control of your API testing tools. Apicat is a fully open-source API client with nothing to hide from you. This open-source API testing tool provides complete transparency and allows you to test…from apicat.com

• 
  Restfox – Open source lightweight alternative to Postman2022 · restfox.dev · ▲758

  Last time I posted this it didn't garner much interest. There have been lots of improvements and fixes since the last release. Quick list of features: - Workspaces - Tabs - Nested Folders - Lots of context menus - Response history - Plugins - Runs fully in the browser and runs offline if necessary - Chrome and Firefox extension to bypass CORS restrictions - Desktop builds for all platforms - GraphQL support - Import collections exported from Postman and Insomnia - Simple user friendly interface I built this because I love Insomnia but wanted a portable version that I could run in the…

• 
  Apidog2024 · apidog.com · ▲570

  Development teams often struggle with using multiple tools like Postman and Swagger for API design, development, and testing. This fragmented approach leads to outdated API specs and chaotic collaboration. So we built Apidog: a single, unified API platform for team collaboration. It has a beautiful interface that makes it easy to create API spec, generate request data from API spec, validate responses, create mock data, orchestrate test scenarios, and publish API documentation. Apidog = Postman + Swagger + Mock + JMeter.

• 
  Postman2014 · postman.com · ▲182

  Postman is a powerful HTTP client to test REST API

• 
  Postcat2024 · github.com · ▲16

  A powerful open source, cross-platform API development tool.

• 
  Postman for Mac (Beta)2016 · postman.com · ▲372

  Build, test, and document your APIs faster

• 
  API Explorer2025 · apiexplorer.vercel.app · ▲7

  Test, document, and optimize apis effortlessly

• 
  /dev/null▲486

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 26d ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 21d ago · talanoa.email

• 
  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

• 
  Cursor 2.0▲957

  Our first coding model and new interface for agents

  AI · Oct 2025 · cursor.com

• 
  Flask▲806

  Notion + Loom, for video collaboration.

  AI · 2025 · flask.do

• 
  Strange Attractors▲804

  I went down the rabbit hole on a side project and ended up building this: Strange Attractors(https://blog.shashanktomar.com/posts/strange-attractors). It’s built with three.js. Working on it reminded me of the little "maths for fun" exercises I used to do while learning programming in early days. Just trying things out, getting fascinated and geeky, and being surprised by the results. I spent way too much time on this, but it was extreme fun. My favorite part: someone pointed me to the Simone Attractor on Threads. It is a 2D attractor and I asked GPT to extrapolate it to…

  AI · Oct 2025 · blog.shashanktomar.com

• 
  Orchestra▲793

  A chat-centric workspace for builders and modern teams

  Work · 2025 · orch.so

• 
  Autism Simulator▲779

  Hey all, I built this. It’s not trying to capture every autistic experience (that’d be impossible). It’s based on my own lived experience as well as that of friends on the spectrum. I'm trying to give people a feel for what masking, decision fatigue, and burnout can look like day-to-day. That’s hard to explain in words, but easier to show through choices and stats. I'm not trying to "define autism". I’ve gotten good feedback here about resilience, meds, and difficulty tuning. I’ll keep tweaking it. If even a few people walk away thinking, "ah, maybe that’s why my coworker struggles in those…

  Life & fun · 2025 · autism-simulator.vercel.app

• 
  Director▲768

  Lovable for web automation

  AI · 2025 · director.ai