I got tired of Postman's cloud sync and RAM bloat, so I built an offline, Rust-native alternative

For years, Postman was my go-to tool for API testing. But recent updates made it increasingly frustrating to use: mandatory cloud account logins, telemetry tracking, runner restrictions (limited to 25 runs/mo), and eating upwards of 1.2 GB of RAM on heavy Electron runtimes.

As a developer working with microservices, I needed something fast, private, and capable of organizing 30+ services without massive clutter.

So I built ReqX — an ultra-fast, 100% offline-first API client powered by Tauri v2 + Rust.

👉 GitHub Repository: https://github.com/lgponlylove/reqX

⚡ Key Highlights of ReqX

1. 🌲 Multi-Level Directory Tree (Solved Postman's biggest flaw)

In Postman, collections are forced into a single, unending flat list. In enterprise projects with dozens of microservices, this becomes chaotic.

• ReqX introduces Project Directories: Group related collections into parent folders ([ERP System] -> Inventory API, Billing API, Auth API).
• An interactive Tree Structure Modal lets you see your entire system architecture from a bird's-eye view and reorder nodes effortlessly.

2. 🚀 Blazingly Fast & Lightweight

• Sub-second startup (~0.8s) vs 10+ seconds on Postman.
• Memory footprint under 100MB RAM (built with native Rust & WebAssembly).
• Completely offline: Zero cloud telemetry, zero account required. Your API keys and tokens never leave your disk.

3. 🔄 Git Workspace Native (reqx_workspace)

Instead of paying expensive cloud seat fees ($14–$49/user/mo), ReqX exports clean directory JSON structures that you can commit straight to your team's Git repo without merge conflicts.

4. 🧪 Unlimited Collection Runner & Smart Flows

• Uncapped Runner: No 25-run paywalls. Test bulk datasets with CSV & JSON files.
• Smart Flow Canvas: Drag and drop requests, extract response tokens, branch on HTTP status codes, and inspect exact step-by-step waterfall latency graphs.
• Built-in Localhost Mock Server: Boot a mock server in 5 seconds to stub backend endpoints with custom status codes and simulated delays.

5. 💻 Headless CLI for CI/CD (The Newman Alternative)

ReqX ships with a dedicated 600KB CLI (reqx run) to automate collection tests in GitHub Actions, GitLab CI, or Jenkins. It also features reqx env lint to catch missing variables and prevent leaking secrets to Git.

6. 3-Second Migration

Switching is 100% painless:

1. Export your collection from Postman (v2.1).
2. Click Import in ReqX.
3. All your requests, folders, environments, and pm.* test scripts run immediately without modifications.

📦 Try It Out!

ReqX is open-core and free for developers:

• 🔗 GitHub Repository: https://github.com/lgponlylove/reqX
• 💾 Pre-built Releases: Windows (.msi, .exe) and Linux (.AppImage, .deb) are available in the Releases tab.

I'd love to hear your thoughts, feedback, and feature requests from fellow developers in the comments!