Life & fun · alternatives · 2026
24 alternatives to Hard Lines
Breadth-first spaced repetition for chess openings
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1WU
Chess openings visualized from over 800 million Lichess games, 2 million tournament games and 1 million chess engine games.
2019 · chessroots.com · its alternatives →
- 2
Chess openings with spaced repetition right in your browser
May 2026 · chesslines.carrd.co · its alternatives →
- 3IM
As you solve LeetCode questions, you can mark them as hard, medium, or easy. The tool will then recommend questions you should review based on (1) how hard the question was for you and (2) how much time has passed since you last reviewed it. I'd recommend normally attempting LeetCode problems and just marking them as hard, medium, or easy for you at first so the tool knows which problems to recommend you review! Here's the theory behind spaced repetition and learning if interested: https://www.codecademy.com/article/spaced-repetition
2024 · lanki.xyz · its alternatives →
- 4
Which chess opening best captures your startup’s strategy?
2020 · chess24.outgrow.us · its alternatives →
- 5
Chess pattern training. No timers, no streaks, no ratings.
Jun 2026 · boxwoodchess.com · its alternatives →
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- 9
- 10
Practice chess openings until they stick
Jul 2026 · trychessmate.com · its alternatives →
- 11
Explore data with Python & SQL, work together with your team, and share insights that lead to action — all in one place with Deepnote.
2021 · deepnote.com · its alternatives →
- 12
Hi, this is my first HN submission so please forgive the rough edges. For this project gathered chess positions from some well-known chess players with a lot of games. (Usually ~25k games and 1M+ positions. The most for any player was GM Aman Hambleton with 1.8M positions indexed.) With each board position I create a probability distribution of moves the player has made from that position. Then, I simply draw from that distribution (with sampling temperature) to choose a move. As long as there's at least one game with a given position, you can keep playing. You'll see that it's pretty easy…
2022 · d2frm2q2a7fq8v.cloudfront.net · its alternatives →
- 13
Master your chess openings the interactive way
2025 · chess999.com · its alternatives →
- 14
Spicy Chess▲76Hello! I created SpicyChess(https://spicychess.com) because I wanted a tactics training app that would have the following features: - Spaced Repetition. - Countdown time to simulate blitz Chess where you have to find the best move quickly. - The ability to save puzzles for later review. I'd love to hear any feedback that you may have !
2023 · spicychess.com · its alternatives →
- 15
ChessUp▲82An incredible chess board with a built-in chess instructor
2021 · playchessup.com · its alternatives →
- 16
- 17Chess Scanner▲123
Scan score sheets and generate chess games in seconds.
2024 · chessscanner.com · its alternatives →
- 18
ChessWoodie▲26I built ChessWoodie as a platform for structured chess tactics training. Most puzzle trainers give you random puzzles. That can help calculation, but it also means you rarely see the same pattern twice, which makes it harder to build fast pattern recognition. ChessWoodie organizes puzzles into courses where the same positions repeat across training cycles. The approach is inspired by the Woodpecker Method: solving the same puzzles repeatedly until the patterns become automatic. You can try it directly in the browser. There’s a guest login if you want to jump straight into solving puzzles.…
Jul 2026 · chesswoodie.com · its alternatives →
- 19
Master your prep and start each chess game with an edge.
2023 · pawndojo.com · its alternatives →
- 20
Claude Code skills for chess post-mortems: Stockfish-backed annotated PGN, HTML viewer, narrated video - brumar/chess-postmortem-skills
Sep 2026 · github.com · its alternatives →
- 21
blunderchess.net is an open source, peer-to-peer chess app where every five moves, players each get to make one blunder-move for their opponent
2025 · blunderchess.net · its alternatives →
- 22CM
2016 · chessboardifygame.xyz · its alternatives →
- 23
Half chess▲76A casual chess game where games only last 5 minutes
2020 · apps.apple.com · its alternatives →
- 24
TabTactics▲66Improve your chess passively with every new tab
2022 · chromewebstore.google.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →