HarborClient

HarborClient is a free, open-source desktop API client for macOS, Windows, and Linux. It gives you a familiar Postman-style workspace—collections, environments, request scripts, and a tabbed editor—while keeping your work on your machine or on storage you control. There are no accounts, subscriptions, or required cloud sync.

Who is it for? Individual developers testing REST and HTTP APIs locally Teams that want shared collections without per-seat fees or vendor cloud sync—via a shared database, Team Hub, or git-backed collections Privacy-minded users who want data on their machine or infrastructure they operate (SQLite by default; optional MySQL, PostgreSQL, or Firestore) Postman users looking to migrate—HarborClient imports Postman v2.1 collection exports (see collections docs) Why HarborClient instead of alternatives? Most API clients tie your collections to a vendor account and a hosted sync service. HarborClient takes a different approach: your requests and environments live where you choose, and the app stays free to use.

No lock-in — pluggable storage backends; export collections as portable JSON You own your data — local SQLite by default, or connect to a database you run Free forever — no accounts, subscriptions, or usage limits Real desktop app — a native Electron app, not a browser tab or hosted SaaS Collaboration on your terms — share via a common database, git repositories, or a self-hosted Team Hub Familiar workflow — collections, environments, pre/post scripts, and Postman import for a smooth switch HarborClient does not claim full Postman feature parity; some Postman settings and scripts may need adjustment after import.