Chess Opening Book vs YKI Master

Chess Opening Book turns the openings you half-remember into moves you know by instinct. Choose an opening, pick a side, and practice it move by move until the line becomes second nature. Play the right move and keep going. Make a mistake, and the app takes you back to the beginning so you can reinforce the full sequence. TWO WAYS TO TRAIN • Many Reps — Learn three moves at a time. Each repetition starts from move one, helping you build the entire line into memory. • Study — See every move in the line without repetition. Ideal for learning an opening for the first time or refreshing one you already know. WHAT'S INSIDE • 30 opening lines across 20 families, from the Italian Game to the King's Indian Defence • Both sides of every line — learn to play it as White and respond to it as Black • A skill map that shows what you've learned and what is due for review • Spaced repetition that automatically brings openings back when it's time to practice them • Pin two openings to your home screen for instant access • Three visual themes • Available in English and Turkish FIND MY OPENING Not sure what to learn next? Answer five questions about the way you like to play, and Chess Opening Book will suggest openings that match your style. Recommendations for White are free. Recommendations for Black are included with the Black Repertoire subscription. NO ACCOUNT. NO INTERNET. NO TRACKING. Everything happens on your device. There is no account to create, nothing is uploaded, and training works completely offline. Your progress stays yours. Export your training data as plain text from Settings and import it on another device whenever you want. BLACK REPERTOIRE Unlock opening recommendations for Black and access new defensive lines as they are added to the library. Black Repertoire is a monthly subscription that renews automatically unless cancelled. Payment is charged to your Apple ID at confirmation of purchase. You can manage or cancel your subscription at any time through your Apple ID settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kuplulumert.github.io/chess-opening-book/privacy.html

Preparing for the YKI test? YKI Master helps you build real confidence in Finnish or Swedish — one practice session at a time. YKI Master is an AI-powered study companion for the National Certificate of Language Proficiency (YKI) exam, covering both Finnish and Swedish. Practice speaking, writing, reading, listening, and vocabulary in one place, get instant feedback, and walk into test day prepared. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ SPEAK NATURALLY • Practice real, everyday dialogues — ordering coffee, asking for directions, chatting with a colleague • Record your answers and get instant AI feedback on fluency, vocabulary, and grammar • React to prompts and tell short stories, just like on the real exam LISTEN AND UNDERSTAND • Train your ear with audio comprehension exercises in Finnish and Swedish • Build the skills to follow real conversations and announcements at natural speed READ WITH EASE • Practice with news, interviews, and society texts in the style of the real exam WRITE WITH CONFIDENCE • Practice informal messages, formal letters, and opinion pieces • Get detailed feedback on structure, tone, and language accuracy BUILD YOUR VOCABULARY • Learn new words with flashcards and quizzes • Add your own words and track what you've mastered SIT A FULL MOCK EXAM • Simulate the real YKI format: storytelling, dialogues, reactions, and opinion pieces for Speaking; informal, formal, and opinion writing for Writing • Prompts are drawn at random across topics, just like the actual test TRACK YOUR PROGRESS • See your estimated level after every session • Build a daily streak, earn badges, and watch your skills grow over time Whether you're preparing for citizenship, further studies, or work in Finland, YKI Master gives you a flexible way to practice anywhere, anytime — no classroom required. YKI Master is an independent study tool and is not affiliated with the official YKI testing authority. Estimated levels are a practice guide only and are not official YKI scores.