Sum vs Study Time Memo

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

■ About Study Time Memo A simple notebook for logging your study time by hand. Register your own subjects and enter the minutes each time you study. No timer, no GPS. ■ Features - Register any subject (name, emoji, color) - Log study time in minutes, entered manually - Add a date and a short note - See your weekly total at a glance - Per-subject totals and ranking - Day streaks to visualize consistency - Weekly study-time chart - Home screen widget showing this week's study ■ Who it's for - Students preparing for exams or certifications - Anyone balancing time across subjects - Building a daily study habit - People who prefer simple manual logging ■ Privacy Everything is stored on your device. No account or connection required. You can export your data as CSV. ■ Note This app is a tool for recording study time. It does not guarantee better grades or learning outcomes. All subject names and data shown are samples.