Cost / License
- Free
- Open Source
Application typeApplication types
Platforms
- Mac
- Windows
- Linux
- Google Chrome
- Firefox



Apps similar to HarborClient include Bruno, which is open source with a free version. Other options are Postman, Insomnia REST Client, Yaak and Hoppscotch. API Clients like HarborClient are a crowded field, with more than 50 alternatives for Mac, Windows, Linux, the web and Chrome OS.



HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and first class support for testing.




The Zero Trust API Client - A Secure & Free Alternative to Postman , Insomnia & Thunder Client.




Lama2 defines the human-friendly l2 syntax and CLI for describing and executing APIs. Store your APIs in plain-text files. Collaborate with team using version control (say, git). Run Lama2 directly from VSCode extension. Think of Lama2 as Markdown for APIs.


apiman is an open source API management layer that streamlines repetitive tasks often required when providing an API, such as implementing security, throttling and billing.
Httpiness is aimed to be a simple, straightforward HTTP client which minimizes time to configure, send, reconfigure and resend requests in order to maximize development efficiency.


RestCase is a security-focused API development platform that enables its users to rapidly create secure microservices, mock them in order to start testing, monitor APIs and collaborate on their development and testing.


API Test Base is a free, offline-first tool for testing APIs and their side effects — the records an API writes to a database, the messages it publishes to a queue, the downstream services it calls. Test cases are created with a no-code / low-code UI, and the same tests can be...


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.




The API Astrolab enables today’s API-first companies to show their API products in a visual way so that anyone can understand how they work.



APITree is a free cloud-based API tool to create, manage and share OpenAPI specifications. It converts your OpenApi v2 / v3 specification into a beautiful technical API documentation. Public API documentation is hosted for free.
Humlix shows you an easy way of generating tests for your web APIs. All you need to do is create a test request using the test request builder within Humlix and give an example of how your endpoints look and what type of data they want.
