Stackd vs Proof Workshop

This is a simple study timer app that allows you to record and manage your study time by subject. Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar. No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies. [Main Features] - 3 timer modes (Stopwatch, Countdown, Pomodoro) - Management of subjects, materials, pages, and notes - Weekly graphs to check subject balance (bar chart & donut chart) - Calendar to visualize study days with color-coding - Display of consecutive study days (streaks) - Daily study reminder - Backup and data export functions [Stackd Pro (One-time purchase)] - Monthly graphs and cumulative line graphs - Setting weekly goals and checking achievement rates - 9 color themes - Home screen and lock screen widgets - Real-time timer display on the Lock Screen

From reading proofs to building them. Proof Workshop covers core undergraduate math-major courses with concept cards, worked examples, practice problems and a proof builder. No account, no sign-up — your progress stays on your device. PROOF BUILDER (the core) - Stack shuffled proof steps in the right order - Each proof hides a plausible but wrong trap card built from a common misconception - Checking tells you how many steps are right and exactly where it first goes wrong - Stuck? A hint places just the next step AUTOMATIC REVIEW OF MISSED CONCEPTS - Concepts behind wrong answers collect in your review list - Re-read the concept card, then prove it with a different problem - Intervals grow 1, 3, 7 days as you get it right 8 SUBJECTS, 32 UNITS Calculus, Sets and Logic, Linear Algebra, Real Analysis, Abstract Algebra, Topology, Complex Analysis, Differential Equations - 96 concept cards, 160 practice problems with solutions, 32 proof builds - Math is typeset on-device and works offline - Numeric answers accept any equal form: 3/4 or 0.75 - All concepts, problems and proofs are original — no textbook or exam content copied FREE AND FULL ACCESS - The first unit of every subject is free, proof builder included - Full Access is a one-time purchase that opens units 2-4 of every subject. Not a subscription; it never auto-renews - Restore it on any device with the same Apple ID PRIVACY - No account, no ads, no analytics - Progress is stored only on your device and never transmitted Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://inphilchoi.github.io/mathmajor-privacy/ Contact: creativelab.choi@gmail.com