The free API client that keeps your work private: no accounts, no subscriptions, no lock-in.

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A close-up, slightly angled shot of an ultra-wide monitor on a dark, uncluttered desk, filled with a split-screen view of an API client: structured JSON response viewer on one side, neatly color-coded request configuration on the other. Surrounding the monitor are only a wireless keyboard, a matte-black mouse, and a small, abstract geometric sculpture, suggesting creativity without personal identity. The room is lit by a single cool-white desk lamp, producing gentle side lighting and soft shadows, while the rest of the space falls into a tasteful, defocused blur. The mood is focused and technical, with photographic realism and a clean, modern aesthetic that conveys powerful tooling without any hint of surveillance or tracking.

A private API client

HarborClient is a free, open-source desktop API client for developers who value privacy. Send HTTP requests, inspect responses, and debug locally with no accounts, no telemetry, and no subscriptions getting in your way.

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About

Why HarborClient exists

Most API clients now sit behind paywalls, logins, and analytics. HarborClient keeps things simple: a lightweight desktop app that runs entirely on your machine, so your requests and responses never leave your development environment.

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A top-down photographic view of a dark concrete desk surface featuring a tablet and a laptop side by side, both showing consistent, privacy-focused API client interfaces with organized request history, environment selectors, and response tabs, all rendered in a subtle dark theme. Around them lie only a blank notepad, a graphite pencil, and a pair of over-ear headphones, all arranged with deliberate symmetry. Overhead diffused studio lighting creates soft, even illumination with almost no harsh shadows, giving a calm, precise atmosphere. The composition uses strong geometric lines and negative space, highlighting the devices and their lock-in-free, accountless workflow, without any visible text or logos.
A futuristic glass desk floating in front of a large, softly blurred cityscape at dusk, viewed through floor-to-ceiling windows. On the desk, three frameless holographic-style screens appear to hover, each showing different aspects of an API client: one with a visual request builder, one with formatted JSON responses, and one with a timeline of calls, all using cool cyan and deep navy tones. Subtle reflections shimmer on the desk surface. The scene is lit by ambient twilight and a soft under-desk glow, creating a high-tech yet serene mood. Captured from a slightly elevated, wide-angle perspective in photographic realism, the image emphasizes freedom, transparency, and private control over data without any people or textual elements.

Features

Build and send HTTP requests, organize environments, inspect headers and JSON bodies, replay calls, and export collections. HarborClient runs locally on Windows, macOS, and Linux with no external services or background sync.

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Reviews

Aya Nakamura

HarborClient replaced our paid API tool. No logins, no sync delays—just fast, local requests that stay on our network.

Mateo García

I can test internal services on my laptop without worrying about data collection or account access expiring. Exactly what I needed.

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123 Example StreetSan Franciso, CA 12345

Hours

Open source, always

Phone

(123) 456-7890