Chess Lines is a Chrome extension that drills your opening repertoire using spaced repetition. Practice move-by-move, get quizzed at the right intervals, and actually retain the lines you study. Works 100% offline — no account, no sync required. Free plan includes 6 lines. Lifetime upgrade ($10) unlocks all 86 lines across 23 openings for both White and Black.

Mintlify — Knowledge infrastructure for AI agents

Knowledge infrastructure for AI agents

Hey Product Hunt! 👋 I built Chess Lines because I kept forgetting opening lines between study sessions — I'd learn a variation, feel good about it, then blank the next day at the board. The extension applies SM-2 spaced repetition (the same algorithm behind Anki) to chess openings. You practice move-by-move, and the extension schedules your next review based on how well you did. Lines you struggle with come back sooner. Lines you know cold space out further. A few things I'm proud of: Works 100% offline after install — no account, no API calls, nothing phoning home 86 lines across 23 openings covering the most popular systems for both colors Free to start — 6 lines unlocked immediately, lifetime upgrade is $10 Would love feedback from the chess community here. Sometimes you just need a line!

Mintlify — Knowledge infrastructure for AI agents

Knowledge infrastructure for AI agents

Chess Lines

Chess openings with spaced repetition right in your browser

Chess openings with spaced repetition right in your browser