Offline-first API workspace

Test APIs
Locally.

No cloud. No sync. No subscriptions. A blazing-fast API workspace that lives entirely on your machine — private, secure, and always available.

⬇ Download Free Explore Features →

100% Local Storage No Cloud Sync Zero Telemetry Postman Compatible

api-binder — bash

❯ api-binder ping https://api.example.com

✔ Host reachable — avg 14ms · TTL 64

❯ api-binder ssl https://api.example.com

↓ Certificate downloaded — expires 2026-11-12

❯ api-binder swagger ./project --all

✔ Swagger generated — 24 endpoints · saved to ./docs/

Why API Binder

Built for developers
who value privacy.

Unlike cloud-based tools, API Binder keeps everything local. Your tokens, history, and collections never leave your machine.

🔒

Fully Offline

All data stored locally on disk. Works without internet. No accounts required to use core features.

📦

Import & Export

Seamlessly import/export projects to/from Postman or other tools. Migrate your entire workspace in seconds.

⚡

Instant Startup

Lightweight native app with zero cloud overhead. Launches in under a second every time.

👥

Multi-Profile

Up to 5 separate user profiles on the same machine, each with their own isolated project collections.

🧪

Load Testing

Run load tests on any request to measure throughput, latency, and error rate — all locally.

🖥️

Mock Server

Spin up a local mock server to simulate API responses and develop without a real backend.

All Features

Everything in one
offline workspace.

15 powerful features — all running locally, all designed to make API development faster and more private.

🔒 Offline Workspace

All API collections, environments, and history are stored locally. No cloud account required. Your data never leaves the machine.

Core

📥 Import Collections

Import API collections from Postman, Insomnia, and other compatible tools. Migrate your entire workspace in seconds.

Core

📤 Export Collections

Export your full project or any sub-folder as a Postman-compatible collection. Share with teammates without sharing credentials.

Core

🏓 Ping Utility

Ping any URL from the address bar to check host reachability, round-trip time, and packet loss. No terminal needed.

Utility

🔌 Telnet (Port 443)

Test TCP connectivity to port 443 with a built-in Telnet-style command. Verify firewall rules without leaving the app.

Utility

🔐 SSL Certificate

Download and inspect the SSL certificate for any URL. Check expiry, issuer, SANs, and chain — all in one click.

Utility

⚙️ cURL Generator

Instantly generate cURL commands for any request — ready to paste into CI pipelines, scripts, or share with your team.

Core

📄 Swagger — Single Request

Generate OpenAPI / Swagger documentation for any individual request with one click. Auto-populated from your request structure.

Core

📚 Swagger — Full Project

Generate a complete OpenAPI spec for an entire project folder containing dozens of requests. Perfect for publishing API docs.

Pro

🕒 History Tracking

Per-request history tracking lets you review every past call, response, timing, and status code independently. No global log noise.

Core

🚀 Load Testing

Hammer any endpoint with configurable concurrent users and duration. View throughput, P95 latency, and error rates in real time.

Pro

👤 Dual Profile Login

Core

👥 Five Profile Login

Support up to five separate profiles on one machine. Ideal for shared workstations and team labs — no conflicts, ever.

Pro

🔍 Smart Debugging

Deep request diagnostics including DNS resolution time, TLS handshake duration, and Time-to-First-Byte (TTFB) breakdown.

Pro

15 ★

🖥️ Mock Server

Define mock responses and spin up a local HTTP server instantly. Build and test your frontend without waiting for the real backend.

High Value

Pricing

Simple, honest pricing.

No subscriptions that lock your data in the cloud. Start free, unlock power features when you're ready.

Starter

Free

Forever free

For individuals getting started with local API testing.

✓ Offline workspace

✓ Import & export collections

✓ Ping, Telnet, SSL tools

✓ cURL generator

✓ Swagger — single request

✓ Request history

✓ 2 profiles per machine

Download Free

Test APIsLocally.

Built for developerswho value privacy.

Everything in oneoffline workspace.

Simple, honest pricing.

Get API Binder

Test APIs
Locally.

Built for developers
who value privacy.

Everything in one
offline workspace.