{"app_store_id":6466343415,"slug":"chessbook-master-openings-6466343415","name":"Chessbook - Master openings","subtitle":null,"icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/3c/c0/51/3cc0518d-cabf-7c27-5f9c-c624821da261/AppIcon-0-0-1x_U007epad-0-1-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/chessbook-master-openings/id6466343415?uo=4","price":0,"currency":"USD","rating":4.88037,"rating_count":2140,"in_app_purchases":null,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Education","version_date":"2026-10-16T17:40:00Z","updated_at":"2026-10-21T02:36:13.457Z","stale":false,"missing_since":null,"one_liner":"Builds and trains a chess opening repertoire with spaced repetition, gap finding and Lichess or Chess.com game review.","verified_maker":false,"maker_site":null,"file_size_bytes":123827200,"minimum_os":"15.0","content_rating":"4+","language_count":1,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/4e/2c/86/4e2c868a-7461-c29c-38b9-f1296b5df9f3/cddce326-4ce3-4aac-b250-5a12c685c82d_ios_home_small.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/46/ad/1e/46ad1e3f-54e9-5635-91a0-1cd3f292a3db/909adffc-b667-4e31-8afa-dca9773a2181_1_APP_IPHONE_55_1.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/6d/a2/fe/6da2fe76-48c8-2627-315b-f5322bc364b4/8470b4bc-c0c2-4a1b-9ce5-274f4ca1c33c_2_APP_IPHONE_55_2.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/02/70/a9/0270a95a-3b9e-5f3c-6515-31c841bf0cdc/65083f03-6142-4b54-bc23-027a3103d09f_3_APP_IPHONE_55_3.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/be/e4/49/bee4498b-f474-84b0-4821-21fb0560c1d6/486d8961-66de-4bad-861a-340a7f7b3122_4_APP_IPHONE_55_4.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/05/93/31/05933104-9ea0-df44-6c42-17c2a54d3dbb/eb20c7e4-30d1-48ab-a649-face25d1d687_ios_model_small.png/392x696bb.png","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/40/21/bd/4021bde1-46b7-0794-4e22-0916a1f45688/770db940-38ba-4b6d-ae50-2e63239db726_5_APP_IPHONE_55_5.png/392x696bb.png"],"developer_name":"Chess Book, Inc.","editors_choice":null,"url":"https://apptierlist.com/apps/chessbook-master-openings-6466343415/","api_url":"https://apptierlist.com/api/v1/apps/chessbook-master-openings-6466343415","schema_version":"1.0","generated_at":"2026-10-22T03:32:05.389Z","data_as_of":"2026-10-22T02:11:13.525Z","description":"Chessbook is the fastest way to build a bulletproof opening repertoire.\n\nKey features:\n• Create a custom repertoire\n• Train with spaced repetition\n• Find gaps automatically\n• Avoid obscure moves\n• Handle transpositions\n• Find mistakes in your online games\n• Fast & modern interface\n\n“A fun and simple way to build an opening repertoire based on probabilities of most likely lines. You will actually learn the moves that will happen on the board!”\n—Grandmaster Eugene Perelshteyn\n\nFIND THE GAPS IN YOUR REPERTOIRE BEFORE YOUR OPPONENTS DO\nChessbook calculates your coverage per opening so you always know what to work on.\n\nPICK THE BEST MOVES TO MAXIMIZE YOUR WIN-RATE\nWeigh up your options by looking at stats from master games, engine evaluation and results at your level.\n\nONLY SPEND TIME ON THE MOVES YOU'LL ACTUALLY SEE\nMost books and courses are written by masters for masters. Chessbook lets you avoid obscure grandmaster lines and focus your effort on the moves that are common at your level.\n\nTARGETED PRACTICE MEANS YOU'LL NEVER FORGET A MOVE\nChessbook uses spaced repetition, a scientifically proven technique to memorize openings quickly and thoroughly.\n\nCOLLECT ALL YOUR OPENINGS IN ONE PLACE\nNobody gets their whole repertoire from a single course or book. Chessbook lets you combine openings from multiple sources to create a custom repertoire just for you.\n\nREVIEW YOUR ONLINE GAMES FOR OPENING MISTAKES\nGet instant feedback on how well you're sticking to your repertoire. Chessbook supports both Lichess and Chess.com\n\nLEARN MIDDLEGAME PLANS FOR ANY OPENING\nSee how top players handle the positions that result from the openings you play.\n\nCHESSBOOK PRO\nChessbook Pro gives you the ability to add unlimited moves to your repertoire! Free users can add 400 moves.\n\nTerms of Use: https://chessbook.com/terms-and-conditions.html\nPrivacy Policy: https://chessbook.com/privacy-policy.html","facts":{"developer_id":1707243137,"developer_url":"https://chessbook.com","first_released":"2023-10-04T07:00:00Z","support_url":null,"privacy_url":null,"website_url":null,"app_version":"1.3.51","release_notes":"Bug fixes, improvements, and polish","rating_current_version":4.88037,"rating_count_current_version":2140,"star_counts":null,"genres":["Education","Games","Board"],"languages":["EN"],"content_advisories":null,"device_families":null,"chart":null},"freshness":{"apple_read_at":"2026-10-21T02:36:13.457Z","catalog_read_at":null,"reviews_checked_at":null,"summary_written_at":"2026-10-20T09:26:11.596Z","placed_at":"2026-10-20T01:49:11.650Z","scored_at":"2026-10-22T02:11:13.525Z"},"editorial":{"one_liner":"Builds and trains a chess opening repertoire with spaced repetition, gap finding and Lichess or Chess.com game review.","what_is":"Chessbook is an education app for building a chess opening repertoire. It lets users create a custom repertoire by combining openings from multiple sources, train moves with spaced repetition, and find coverage gaps. It can also review online games from Lichess and Chess.com for opening mistakes.","good_for":["Combining openings from several books or courses into one repertoire","Checking Lichess or Chess.com games for deviations from your openings","Memorizing common lines at your level with spaced repetition"],"pricing":"Chessbook - Master openings is free to download on the App Store.","faq":[{"q":"Does the app cost anything?","a":"The app is free to download. The listing says free users can add 400 moves to a repertoire, and Chessbook Pro allows unlimited moves."},{"q":"Can it check my online games?","a":"Yes. It reviews your games on Lichess and Chess.com and gives feedback on how well you stick to your repertoire."},{"q":"Does it cover middlegame plans?","a":"It shows how top players handle the positions that arise from the openings you play."}],"model":"claude-haiku-5-5","created_at":"2026-10-20T09:26:11.596Z"},"memberships":[{"list":"spaced-repetition-learning","list_name":"spaced repetition learning","list_status":"draft","list_url":null,"position":null,"tier":null,"score":67.7,"components":{"rating":97.6,"votes":73.3,"rank":0,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"under_review","confidence":"provisional","judged_at":"2026-10-20T01:49:11.650Z"},{"list":"chess-learning","list_name":"chess learning","list_status":"active","list_url":"https://apptierlist.com/best/chess-learning/","position":19,"tier":"C","score":67.7,"components":{"rating":97.6,"votes":73.3,"rank":0,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"provisional","judged_at":"2026-10-20T01:49:11.650Z"}],"main_list":"chess-learning","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"history":[{"id":181349,"at":"2026-10-20T01:57:11.541Z","kind":"tier_changed","list":"chess-learning","app_store_id":6466343415,"app":"chessbook-master-openings-6466343415","from":null,"to":"C","reason":"score 67.7","job":"rescore"},{"id":181055,"at":"2026-10-20T01:49:11.650Z","kind":"membership_added","list":"spaced-repetition-learning","app_store_id":6466343415,"app":"chessbook-master-openings-6466343415","from":null,"to":"active","reason":"Listing says it uses spaced repetition, a scientifically proven technique, to memorize openings; targeted practice is a core feature.","job":"shadow"},{"id":181054,"at":"2026-10-20T01:49:11.650Z","kind":"membership_added","list":"chess-learning","app_store_id":6466343415,"app":"chessbook-master-openings-6466343415","from":null,"to":"active","reason":"It is a chess opening trainer for building and memorizing a repertoire, though aimed at players who already know chess rather than beginners, so it is a main le","job":"shadow"},{"id":174947,"at":"2026-10-19T09:43:11.707Z","kind":"app_added","list":null,"app_store_id":6466343415,"app":"chessbook-master-openings-6466343415","from":null,"to":null,"reason":"discovered","job":"import"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); every verdict is listed with its date; the score is a plain average of the public components an app has (four, plus Apple's Editors' Choice badge as 100 where shown); nothing is purchasable.","lists":[{"list":"spaced-repetition-learning","list_name":"spaced repetition learning","status":"active","review_status":"checked","position":null,"tier":null,"score":67.7,"components":{"rating":97.6,"votes":73.3,"rank":0,"recency":100},"ranks":[],"verdicts":[{"verdict":"keep","reason":"Listing says it uses spaced repetition, a scientifically proven technique, to memorize openings; targeted practice is a core feature.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-20T01:49:11.650Z","attempts":1,"current":true},{"verdict":"keep","reason":"Spaced repetition is its core way of memorizing opening lines, which fits next to the subject-specific spaced repetition apps already in the list.","verifier":"list check","decided_at":"2026-10-20T01:49:11.650Z","attempts":1,"current":true}]},{"list":"chess-learning","list_name":"chess learning","status":"active","review_status":"checked","position":19,"tier":"C","score":67.7,"components":{"rating":97.6,"votes":73.3,"rank":0,"recency":100},"ranks":[],"verdicts":[{"verdict":"keep","reason":"It is a chess opening trainer for building and memorizing a repertoire, though aimed at players who already know chess rather than beginners, so it is a main le","verifier":"claude-sonnet-5-5","decided_at":"2026-10-20T01:49:11.650Z","attempts":1,"current":true},{"verdict":"keep","reason":"A chess training app that teaches openings and finds mistakes in your games. 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