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fluera_canvas and the commercial add-ons

fluera_canvas is fully open-source under MIT and meant to stand on its own. You don't need anything else to ship a real drawing app — the free core covers infinite canvas, scene graph, selection / transform, lasso, text, stickers, image annotations, layers, snap-to-grid, smart guides, PNG export and persistence.

That said, the fluera_canvas widget exposes a couple of small, optional extension hooks. If you choose to consume them, you can plug in commercial packages from the same author for use cases the free tier deliberately doesn't address.

fluera_canvas_gpu — native live-stroke + vector export

The free core renders the live stroke through a Dart CustomPainter. Latency is ~12–16 ms — fine for note-taking and whiteboards on a flagship device.

If you need sub-frame latency on a wide range of hardware (Procreate / Goodnotes-class UX), the commercial fluera_canvas_gpu package plugs a native renderer into the same widget tree via the public GpuStrokeBackend interface that ships in this core. Backends: Android Vulkan, iOS / macOS Metal, Linux OpenGL, Windows Direct3D 11, Web WebGPU. Wire it once at main():

import 'package:fluera_canvas_gpu/fluera_canvas_gpu.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  FlueraCanvasGpu.setBackend(FlueraCanvasGpuBackend());
  runApp(const MyApp());
}

With no backend registered the canvas falls back to the Dart painter silently — your app keeps working everywhere fluera_canvas works.

The same package adds vector export: SVG 1.1, PDF 1.5 with multi-page picker, OCG toggleable layers, blend modes via /ExtGState /BM, watermarks, PDF/A-1b conformance, and a drop-in FlueraPdfExportButton widget. They serve the design-tool / pre-print / plotter segments.

fluera_engine_pro — full Notability-class engine

For very specialized note-taking apps the commercial fluera_engine_pro package adds:

  • 13+ advanced brush engines (watercolor, charcoal, fountain pen, oil, neon, ink wash, marker, …),
  • real-time multi-user collaboration (CRDT + vector clocks),
  • in-document PDF annotation editing,
  • LaTeX OCR + AI-assisted tools,
  • SQLCipher encrypted storage,
  • timeline branching and time-travel playback.

Licensing & pricing

Both add-ons live behind a license tier (Indie / Team). See engine.fluera.dev/pricing for the current rates and tier details. The free fluera_canvas package on this page never expires, never throws "license required" prompts, and never phones home — the commercial extensions are entirely additive.