FSRS Rust Dart binding

A Rust implementation of the Free Spaced Repetition Scheduler (FSRS) algorithm with Flutter/Dart bindings using flutter_rust_bridge.

Usage

import 'package:fsrs/fsrs.dart';

Future<void> main() async {
  // Initialize the Rust bridge
  await RustLib.init();
  ...
}

Examples

see examples

Scheduling with learning steps

Use FsrsScheduler when you want Py-FSRS-style learning and relearning steps. The lower-level Fsrs.nextStates() API returns FSRS memory states and review intervals only; FsrsScheduler applies fixed learning-step intervals around those memory-state updates.

import 'package:fsrs/fsrs.dart';

Future<void> main() async {
  await RustLib.init();

  final scheduler = FsrsScheduler(
    parameters: defaultParameters(),
    learningSteps: const [
      Duration(minutes: 1),
      Duration(minutes: 10),
    ],
    relearningSteps: const [
      Duration(minutes: 10),
    ],
  );

  final card = FsrsCard();
  final result = scheduler.reviewCard(card, FsrsRating.good);

  print(result.card.state);
  print(result.card.step);
  print(result.card.due);
}

Features

• Core FSRS algorithm implemented in Rust
• Flutter bindings for cross-platform use
• Memory state management
• Review scheduling
• Item state tracking
• Py-FSRS-style learning and relearning step scheduling

---

Online development

go to https://idx.google.com/import

---

Prerequisites

• Rust (stable channel)
• Flutter SDK (v3.27.3 or later)
• flutter_rust_bridge_codegen (cargo install flutter_rust_bridge_codegen)

Setup

git clone <repository-url>
cd fsrs-rs-dart
flutter_rust_bridge_codegen generate
flutter pub get
cd rust
cargo build -r
cd ..
flutter analyze

License

MIT