Thermion, an open source 3D rendering toolkit for Flutter and/or Dart
I'd like to share Thermion, an open source 3D rendering toolkit I made for Flutter and/or Dart. This came about when I needed a 3D renderer for a Flutter app[0] I was building. At the time, the only off-the-shelf option was to embed Unity, which wasn't ideal for a few reasons - unstable build process, compositing and transparency issues, and licensing uncertainty, just to name a few. In any event, frankensteining Unity (C#) together with Flutter (Dart) didn't seem like a great solution. After browsing for alternative renderers, I discovered Filament[1], an open-source, cross-platform…
Thermion, an open source 3D rendering toolkit for Flutter and/or Dart launched on June 28, 2024 with 52 votes, #744 of 4,672 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Thermion is an open-source 3D rendering toolkit for Flutter and Dart applications. Built on Google's Filament rendering engine, it provides cross-platform 3D rendering capabilities for Android, iOS, Windows, macOS, and web. The toolkit was created to offer a lightweight alternative to embedding Unity in Flutter apps, addressing issues like build instability and compositing problems. Thermion is designed for developers building Flutter applications that require 3D graphics functionality.
written from the facts on this page · September 2026
From the sources
Cross-platform 3D rendering for Dart and Flutter.
Thermion brings Google’s physically based Filament renderer to Dart and Flutter. Load glTF models with PBR materials and skeletal animation, then render them across iOS, Android, desktop, and the browser through a single Dart API. These scenes are written in pure Dart — not Flutter widgets — compiled to WebAssembly and rendered live with Filament. Each viewer boots automatically as it scrolls into view and stops when you scroll away, so only the scenes near the viewport are running. Drag to orbit, scroll to zoom. They’re the same examples_lib scenes that power the standalone gallery , each running in its own cross-origin-isolated iframe. Thermion separates rendering from Flutter…from thermion.dev
In the maker’s words, at launch
I'd like to share Thermion, an open source 3D rendering toolkit I made for Flutter and/or Dart. This came about when I needed a 3D renderer for a Flutter app[0] I was building. At the time, the only off-the-shelf option was to embed Unity, which wasn't ideal for a few reasons - unstable build process…
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