The Free REST API Client
for Developers Who Ship Fast
TiefWise is a fast, lightweight REST API client and HTTP client for macOS and Windows. No cloud sync, no bloat, no signup. Just download and test your APIs.
Available for macOS (Apple Silicon & Intel) and Windows 10/11
What is a REST API Client?
A REST API client is a tool that lets developers send HTTP requests (GET, POST, PUT, DELETE) to APIs, inspect responses, and debug issues. It's an essential tool in every developer's workflow for testing endpoints, building integrations, and validating API behavior.
While tools like Postman and Insomnia have been popular choices, they've grown into large Electron-based applications that require cloud accounts and sync data to external servers. TiefWise takes a different approach — it's a native REST API client that stays lightweight, fast, and completely private.
Why Developers Are Switching to TiefWise
A better REST client experience, built from scratch.
The problem with existing API clients
- x 500MB+ Electron apps that consume system resources
- x Forced account creation and cloud sync
- x API keys and secrets stored on someone else's servers
- x Slow startup times — 3 to 5 seconds
- x No protection against accidental secret leaks
The TiefWise approach
- + Only ~5 MB — native app, no Electron bloat
- + No account, no signup, download and go
- + 100% local storage — your secrets stay on your machine
- + Instant startup — opens in milliseconds
- + SecretGuard auto-detects and protects API keys
REST API Client Features
HTTP Methods
Full support for GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS requests with custom headers and body.
Collections
Organize API requests into collections and folders. Save, reuse, and share your API test suites.
Environments
Switch between dev, staging, and production with environment variables. No manual URL changes needed.
Authentication
Built-in support for Bearer tokens, Basic auth, API keys, and custom auth headers.
Response Viewer
Syntax-highlighted JSON, XML, and HTML responses with headers, timing, and status information.
Execution Plan
Preview exactly what will be sent before executing. Catch unresolved variables and redirect issues before they happen.
REST API Client Comparison
How TiefWise compares to Postman, Insomnia, and Thunder Client.
| Feature | TiefWise | Postman | Insomnia | Thunder Client |
|---|---|---|---|---|
| Price | Free | Freemium | Freemium | Freemium |
| Standalone app | Yes | Yes | Yes | VS Code only |
| App size | ~5 MB | ~500 MB | ~200 MB | VS Code ext |
| Account required | No | Yes | Yes | No |
| Local-first storage | Yes | Cloud default | Cloud default | Yes |
| Secret leak protection | SecretGuard | No | No | No |
| Execution Plan | Yes | No | No | No |
| SSRF protection | Built-in | No | No | No |
Download the Best Free REST API Client
Join developers who chose a faster, lighter, more private API testing experience.
macOS & Windows | ~5 MB | No account needed