Home / Release Notes / FLECS 4.0.0-snowhare: Follow the white hare – and explore the future in Rust

FLECS 4.0.0-snowhare: Follow the white hare – and explore the future in Rust

May 19, 2025

Overview

FLECS 4.0.0-snowhare marks the start of a new era: our core has now been fully migrated from C++ to Rust. The result? Improved performance, security, and system stability. Combined with a new API, revamped app configuration UI, and significantly faster import/export features, this version is a true milestone.

FLECS once again proves itself as the innovation leader for software-defined automation.

Version 4.0.0 Highlights

Rust Migration: Better performance, security, and parallelism

Our core now runs entirely on Rust – a language designed for safety and speed, ideal for industrial use cases.

  • Task parallelization for faster installations and updates
  • Enhanced stability and system security
  • Full SBOM support for transparency and compliance

New Core API v2

The redesigned API improves external tool integration and simplifies control of FLECS Core – faster, more structured, and more automatable.

Completely revamped App Configuration UI

We’ve redesigned the app configuration section in our WebApp:

  • User experience optimized based on real user feedback
  • Easier management of ports, USB devices, and environment variables
  • Cleaner, more efficient interface design

Much faster Import & Export

Our popular features for device onboarding, backup, deployment, and mass rollout have been significantly upgraded:

  • Much faster loading and saving times
  • Full support for all use cases (e.g., OEM rollouts, multi-device projects)
  • More robust and reliable even with large data sets

Bug Fixes

Dozens of minor UI and system fixes improve stability and usability. See the FLECS Core and WebApp changelogs for details.

Get started now

FLECS 4.0.0-snowhare is available as an update via our usual paths. Check our documentation for more information.

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