Chess Journal is a free-to-play chess app for Windows, Linux & Android with a full analysis lab built in: Stockfish at 5 depth presets, on-device AI commentary (Qwen2.5/Gemma 3 — zero cloud, zero API key), a 26,000+ game library (classics, theory, puzzles), natural-language search over your own games, and an Assistive Coach that plays at your level. $5 once unlocks it all — no subscription, ever. 100% offline.