The HTTP workbench

HarborClient is a desktop API client for building, sending, inspecting, and organizing HTTP requests.

It is designed for the part of API development where the real work happens: an endpoint is failing, authentication is behaving differently than expected, a header is missing, or the request that was sent is not quite the request you intended to send.

HarborClient gives you a focused place to investigate what happened, understand the response, adjust the request, and continue working. No account is required. There is no subscription. Your workspace remains under your control.

Built for daily API development

HarborClient provides the tools you expect from a modern HTTP client without trying to turn every task into a platform.

Compose requests with methods, URLs, query parameters, headers, authentication, and request bodies. Organize them into collections and folders. Switch between environments, substitute variables throughout a request, run pre- and post-request scripts, and inspect status codes, timing, headers, and formatted response bodies in a structured workspace.

Import existing collections from tools including Postman and Bruno, or start with OpenAPI and HAR files. When your API changes, keep the requests that describe it close to the rest of your development work.

The goal is straightforward: shorten the distance between “something is wrong” and “now I understand why.”

Part of your development workflow

API requests are not isolated documents. They change alongside application code, environments, authentication systems, and backend behavior.

HarborClient is built to fit into that workflow.

Collections can live in Git so request changes can be reviewed through branches, commits, diffs, and pull requests. Teams can also collaborate through shared database storage or a self-hosted HarborClient Team Hub.

That means your API work can sit naturally beside the tools you already use: your editor, terminal, logs, local services, Docker containers, and source repository.

HarborClient should feel like part of the workbench—not another destination you have to manage.

Your requests. Your storage. Your rules.

HarborClient runs on your computer and does not require a central HarborClient account.

You decide where your collections live. Use SQLite on disk, version them in Git, connect to storage such as PostgreSQL, MySQL, or Firestore, or operate a Team Hub on infrastructure you control.

Your secrets and API keys stay on your machine. The optional AI assistant uses API keys that you provide, allowing you to work with supported AI services without purchasing access through a HarborClient subscription.

You can adopt the parts of HarborClient that fit your workflow without handing control of that workflow to us.

A focused tool that can be extended

A good workbench should be focused without becoming rigid.

Pre- and post-request scripts support repeatable setup, automation, and lightweight tests. Reusable snippets help reduce duplication. Plugins allow HarborClient to support specialized workflows without forcing every possible feature into the core application.

This approach keeps the main interface calm while giving developers room to shape the tool around the way they work.

Craft is part of the product

Developer tools are defined by small interactions repeated hundreds of times.

Keyboard navigation matters. Visible focus matters. Response readability matters. Sensible defaults, predictable behavior, and accessible controls matter. These details rarely make an impressive feature checklist, but they determine whether a tool becomes trusted equipment or recurring friction.

HarborClient is built with attention to those details.

Not because every interaction needs to be clever, but because a professional tool should respect the person using it.

A different kind of API client

Postman has grown into a broad API platform. Bruno has established a strong Git-native and local-first approach. Other clients make different choices about collaboration, storage, extensibility, and workflow.

HarborClient belongs in that same category, but it is pursuing a distinct role: a focused API workbench for developers who spend real time inspecting requests, debugging services, and refining their tools.

It is not intended to become an organizational operating system for every stage of the API lifecycle.

It is intended to be a dependable instrument beside your editor and terminal.

Who HarborClient is for

HarborClient is built for web, backend, and full-stack developers who test APIs regularly and want their tools to fit the way they already work.

It may be a good fit when you want:

• A capable desktop HTTP client without another required account
• Clear request and response inspection
• Collections that can participate in Git workflows
• Control over storage, secrets, and collaboration
• Scripts and plugins for specialized workflows
• A tool that values focus and craftsmanship over platform breadth

HarborClient is free, open source, and available for macOS, Windows, and Linux.

Download it, send a request, and make it part of your workbench.