Abacus Practice vs Synth Brain

Build an answer with beads. Check it, then try your mistakes again. Abacus Practice brings Japanese soroban and mental arithmetic practice to iPhone and iPad. Use the on-screen abacus, work with your own physical soroban, or answer mentally. LEARN AND PRACTICE • 16 introductory lessons with bead movement demonstrations • Addition, subtraction, multiplication and division • Flash mental arithmetic with adjustable speed and column-style drills • Answer checking, per-question results and mistake-only review • Start another session with your previous practice settings CREATE YOUR OWN DRILLS Generate problems from selected conditions and practice them in the app. Timed mock exams show answer progress and scores by subject. These are practice formats based on Japanese soroban exams, not official examinations or a guarantee of passing. FIND YOUR FAVORITE BEADS The standard wooden beads have a detailed natural texture. Pro adds skins including springy mint Jelly and transparent Glass, each with a distinct feel and sound. Try extra skins in the interactive preview before purchase. Sound, haptics and left-handed layout are adjustable. FREE AND PRO Introductory lessons, basic practice, a free abacus, and selected problem-generation and mock-exam options are available free. A one-time Pro purchase unlocks expanded practice conditions, advanced problem generation, PDF worksheet creation and sharing, additional exam levels, and extra skins. There is no monthly subscription. No account or ads. Practice records are stored on this device. Now available in Japanese, English, Simplified Chinese, Traditional Chinese and Korean. Screens, all 16 introductory lessons, instructions, purchases and restore, practice history and PDFs follow your app language. Change it directly in Settings > App language inside the app; your choice applies immediately. There are six skins in total: standard Amber is free; Pro adds Walnut, Red & Ivory, Indigo, Jelly and Glass. The free abacus uses a large landscape board with minimal controls so you can focus on moving the beads.

Learn synthesis by connecting what you see, hear, and change. Synth Brain is a step-by-step learning app for understanding synthesizers and sound design through concise visual lessons, A/B listening, hands-on patch labs, and focused ear training. Memorizing knob names is not enough. Synth Brain connects every control you change with the result you hear. Listen to a target, shape the sound yourself, and check the difference by ear. Follow one structured path from the fundamentals to advanced synthesis techniques. HOW YOU LEARN • Concise visual lessons organize the signal flow and the role of each parameter • A/B comparisons help separate loudness differences from timbral differences • Hands-on labs let you move the controls toward a target sound • Ear-training quizzes develop recognition of brightness, attack, beating, modulation, and more • A built-in synth playground lets you explore each technique freely CURRICULUM HIGHLIGHTS • Pitch, loudness, timbre, harmonics, and gain staging • Basic waveforms, noise, octaves, detuning, beating, and PWM • Low-pass, high-pass, and band-pass filters; cutoff, resonance, and key tracking • Amp and filter envelopes, including ADSR • LFO routing, vibrato, tremolo, wah, and modulation depth • Patch design for basses, leads, pads, plucks, and drums • Layering, chorus, delay, and reverb • FM, hard sync, ring modulation, and additive synthesis SYNTH BRAIN IS FOR YOU IF YOU WANT TO • Understand what the controls on a synthesizer actually do • Move beyond presets and build sounds yourself • Train your ears for music production and sound design • Learn foundations that transfer between hardware and software synthesizers MORE FEATURES • Japanese and English • Designed for iPhone and iPad • No account required • Learning progress stored on your device • A safety limiter that reduces sudden output peaks Protect your hearing and begin at a low listening level. For subtle comparisons, use headphones or wired earphones at a comfortable level. Turn visible controls into knowledge you can hear. Start shaping sound with Synth Brain.