Why We Built Veilus with Rust Instead of Electron
Every anti-detect browser on the market is built with Electron. We chose a different path — and the numbers show why.
The Problem with Electron
Electron is a framework that bundles Chromium and Node.js together, letting developers build desktop apps with web technologies. It’s how VS Code, Slack, Discord, and virtually every anti-detect browser is built.
For most apps, Electron is fine. For an anti-detect browser, it’s a fundamental architectural mistake.
Here’s why: an anti-detect browser’s core job is to run Chromium instances. Electron itself is a Chromium instance. So when you launch a profile in an Electron-based anti-detect browser, you’re running Chromium inside Chromium.
[Electron Shell (Chromium + Node.js)]
└── [Anti-detect UI]
└── [Profile 1: Chromium instance]
└── [Profile 2: Chromium instance]
└── [Profile 3: Chromium instance]Each layer adds overhead — memory, CPU, startup time.
Our Architecture: Tauri + Rust
Veilus uses Tauri, a framework that replaces Electron’s Chromium shell with the operating system’s native webview (for the UI only), and uses Rust for all backend logic.
[Tauri Shell (Native webview — lightweight)]
└── [Rust Backend (memory-safe, compiled)]
└── [Profile 1: Patched Chromium]
└── [Profile 2: Patched Chromium]
└── [Profile 3: Patched Chromium]The UI shell is ~15MB instead of ~150MB. The Rust backend handles profile management, fingerprint generation, proxy routing, and automation scheduling — all compiled to native machine code.
The Numbers
We benchmarked Veilus against two popular Electron-based anti-detect browsers on identical hardware (MacBook Pro M2, 16GB RAM):
Application Startup
| Metric | Veilus (Tauri) | Competitor A (Electron) | Competitor B (Electron) |
|---|---|---|---|
| Cold start | 1.5s | 4.2s | 3.8s |
| App bundle size | 28MB | 210MB | 185MB |
| Idle RAM (no profiles) | 45MB | 180MB | 160MB |
Per-Profile Resource Usage
| Profiles Open | Veilus RAM | Electron RAM | Delta |
|---|---|---|---|
| 1 | 165MB | 380MB | -57% |
| 5 | 520MB | 1.4GB | -63% |
| 10 | 1.0GB | 2.8GB | -64% |
| 20 | 1.9GB | 5.2GB | -63% |
| 50 | 4.5GB | OOM* | — |
*Out of Memory on 16GB system — Electron-based browsers couldn’t maintain 50 simultaneous profiles.
Why This Matters
- More profiles on the same hardware. If you manage 50+ accounts, you’d need 32GB+ RAM with Electron browsers. With Veilus, 16GB is enough.
- Faster profile switching. Less memory pressure means less swapping, which means faster everything.
- Lower electricity costs. Sounds trivial, but if you run profiles 24/7 for automation, CPU efficiency adds up.
Beyond Performance: Why Rust?
Performance was the initial motivation. But Rust gave us other advantages we didn’t fully appreciate until later:
Memory Safety Without Garbage Collection
Rust’s ownership model prevents memory leaks, use-after-free bugs, and data races at compile time. For a browser tool that manages sensitive data (cookies, credentials, fingerprints), this is a security feature, not just a technical detail.
Fearless Concurrency
Veilus runs automation scripts across multiple profiles simultaneously. Rust’s type system guarantees thread safety at compile time — no race conditions, no deadlocks, no “it works on my machine” surprises.
SQLite Integration
Profile data in Veilus is stored in a local SQLite database. Rust’s rusqlite crate gives us direct, zero-overhead access to SQLite — no ORM abstraction layers, no connection pooling complexity. Queries that touch fingerprint data average <1ms.
Binary Size
The entire Veilus Rust backend compiles to a single binary under 15MB. Combined with the Tauri shell, the total app download is 28MB. Compare this to 200MB+ for Electron apps.
The Trade-offs
Being honest about the downsides:
- Smaller ecosystem. Front-end libraries often target Electron first. We had to build more things from scratch.
- Steeper learning curve. Finding Rust developers is harder (and more expensive) than finding JavaScript developers.
- Slower iteration speed. Rust’s compiler is strict. Changes that take 5 minutes in JavaScript can take 30 minutes in Rust. But the bugs those 30 minutes catch would have taken hours to debug in production.
- Platform-specific challenges. Tauri relies on native webviews for the UI, which occasionally behave differently across operating systems. We test on Windows, macOS, and Linux to catch these.
Was It Worth It?
Absolutely. Our users report:
- Running 3-5x more profiles on the same hardware
- Noticeably faster app startup and profile switching
- Zero memory-related crashes (a common complaint with Electron anti-detect browsers)
The anti-detect browser market has been stuck on Electron since 2015. We believe Rust + Tauri is the foundation for the next generation of browser tools — and Veilus is proving it.
Experience the difference. Download Veilus free — built with Rust, run with confidence.