Lexio is a cross-platform desktop app for building vocabulary lessons and practicing them your way—flashcards, typing drills, multiple choice, synonym/antonym focus, or a simple word list. It runs on Windows, macOS, and Linux, stays entirely on your machine, and is free and open source.
| Lessons | Group words by topic, file, or language—each lesson tracks its own progress. |
| Rich entries | Terms, definitions, and optional synonyms and antonyms in one place. |
| Learning modes | Flashcards · Write · Multiple choice · Synonyms & antonyms · Vocabulary list |
| Progress | Correct and incorrect answers are remembered per mode so you see what still needs work. |
| Smart review | Optional weighting toward words you struggle with. |
| Fine-tuned practice | Per-mode settings, including how strictly written answers are graded. |
| Offline & private | No accounts, no telemetry, no network required—data lives only on your device. |
- Flashcards — Flip through term and definition sides.
- Write — Type the answer; good for spelling and exam-style recall.
- Multiple choice — Pick the right definition from four options.
- Synonyms & antonyms — Practice related words without mixing in unrelated terms.
- Vocabulary list — Browse terms, definitions, and related words in one view.
Lexio does not collect usage data or talk to a backend. Lessons and progress are stored locally on your computer. Import and export are file-based—you control where backups go.
- .NET and C#
- Avalonia UI for the cross-platform interface
Open source—see the repository license file for terms.