The API Platform for Humans and AI Agents
RESTK is the first API development platform built for the era where AI agents are first-class users. A native macOS app with a built-in MCP server, end-to-end encryption, and an offline-first architecture.
Built for a New Era
API tools were built for a world where humans were the only users. You open an app, compose a request, hit send, read the response. Every API client on the market — Postman, Insomnia, Bruno — was designed for this workflow.
That world is changing. AI agents are becoming API consumers. They generate requests, run test suites, analyze responses, and chain workflows — all programmatically. But they need context: your collections, your environments, your auth settings. And they need it without compromising your credentials.
RESTK is built for both. A visual interface for developers and a local MCP server for AI agents — sharing the same collections, the same environments, and the same security model. Your AI assistant can help you test APIs without ever seeing your real secrets.
What Only RESTK Can Do
Not a comparison. These are capabilities no other API tool offers today.
Native Swift, Not Electron
Built with SwiftUI from the ground up. Instant startup, low memory footprint, and a UI that feels like it belongs on your Mac. No bundled Chromium, no web wrappers.
Dual Interface: GUI + MCP Server
A visual interface for developers and a built-in MCP server for AI agents. Claude, Cursor, and Windsurf can interact with your collections locally. Credentials are auto-redacted — agents never see real secrets.
Your Data, Your Machine
Local-first storage with AES-256-GCM encryption. When you sync, data is encrypted on your device before it leaves. Our server only stores ciphertext. No forced cloud accounts.
Offline-First Architecture
Core API testing works fully offline — send requests, manage collections, write scripts. Team sync runs in the background when you are online, end-to-end encrypted.
Our Philosophy
The principles that shape every decision we make
Two Users, One Tool
Every feature in RESTK is designed to serve both humans and AI agents. The request builder works for you. The MCP server works for your AI. Same data, same collections, same security.
Your Data, Your Control
Local-first, encrypted by default. Your API secrets stay on your machine. Sync is opt-in and end-to-end encrypted. We built RESTK so that even we cannot read your data.
Native or Nothing
We chose the harder path — building natively for each platform instead of wrapping a web app in Electron. The result is a tool that respects your system resources and feels right at home.
Meet the Team
A small team of experienced builders passionate about developer tools
17+ years building SaaS and developer platforms. Past: Director at LEAD School, Architect at Simpplr Inc., AVP Engineering at IndiaMART. Built offline-first apps at scale, architected cross-platform systems, and shipped products used by millions. Second-time founder — previously built PalxoLabs (Facebook FbStart). NIT Durgapur, Computer Science.
Join Us
We are building something new. If you are passionate about developer tools, native apps, or the intersection of AI and software development, we would love to hear from you.
Ready to try RESTK?
Free during beta. All features included. Download for macOS and start building better APIs.