NetForge

A desktop application for designing, testing, and managing APIs.

Free desktop app for macOS, Windows, and Linux · No account required

Everything you need for the API lifecycle

Design specs, test endpoints, validate responses, and mock services — all in one focused desktop app.

OpenAPI Spec Editor

Full-featured editor with syntax highlighting, validation, live Swagger preview, and a document outline for fast navigation.

Request Collections & Testing

Organize requests into folders, auto-generate them from OpenAPI specs, and authenticate with Bearer, Basic, OAuth 2.0, or AWS Signature v4.

Response Validation

Validate API responses against your OpenAPI spec using JSON Schema — inline error annotations show exactly what went wrong.

Advanced Response Viewer

JSON and XML tree views with search, CSV table rendering, image and HTML preview, plus one-click code-snippet export.

Local Mock Server

Spin up a working HTTP server from any OpenAPI spec. Ship the frontend before the backend is ready — with request logs and per-route overrides.

Environments & Variables

Switch between dev, staging, and prod with {{variable}} substitution. Private variables stay on your machine.

Pre/Post-Request Scripts

A JavaScript sandbox with a built-in nf API lets you manipulate requests, transform responses, and assert test conditions.

Collection Runner

Execute requests sequentially with per-request timing and schema validation. Export runs to a CLI runner for CI/CD pipelines.

Load & Performance Testing

Run any collection under load with configurable virtual users and profiles — fixed, ramped, spike, or peak. Track live throughput, p95/p99 latency, and per-request error rates, with optional CSV or JSON data files to drive each VU.

Built for flow

Fast, keyboard-first, and designed to stay out of your way.

Edit OpenAPI specs with live preview and outline navigation.

Execute API requests and inspect responses with syntax highlighting.

Spin up a local mock server from any spec, with reponse validation and request logs.

Download NetForge

100% free. No account, no telemetry, no strings.

Download for macOS

Apple Silicon DMG · 156 MB

SHA-256

023403a5b534046c92737182d199ddbd36987495325ba13c2de7031d3a5b987a

Download for Windows

64-bit installer · 127 MB

SHA-256

313733c38d743769ddbb1a026e51913b402b71beefe36c5c3bcc8d865a75c74a

Download for Linux

AppImage · 161 MB

SHA-256

e0f40eb3cd2a99bb16f718d4a6b6fb76c81a3af59a749b3f769ce84d6773a67d

Current version 0.2.2 · Released under the Permanent Waves banner. Verify any download with shasum -a 256 <file> (macOS/Linux) or certutil -hashfile <file> SHA256 (Windows).

Frequently asked questions

Is NetForge really free?

Yes. The NetForge desktop app is free to download and use on macOS, Windows, and Linux. No account required.

Which platforms are supported?

macOS (Apple Silicon), Windows 10/11 (64-bit), and Linux (AppImage).

Where does my data live?

Everything — specs, collections, environments, private variables — is stored locally on your machine. NetForge does not send your API data anywhere.

Does it need an account or internet connection?

No. You can install NetForge and use every feature of the desktop app fully offline.

How do I report a bug or request a feature?

Email support@permanentwaves.tech and we’ll follow up.