Stackd: Study Timer & Tracker

Pomodoro, calendar, graphs

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

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

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【New】 Pro users can now see their active timer in real time on the Lock Screen. ・Stopwatch and countdown: Shows the subject name and elapsed/remaining time ・Pomodoro: Shows the total session time ・When you pause the timer in the app, the Lock Screen display pauses as well ※Due to an iOS limitation, the Lock Screen cannot display transitions between work and break periods in real time for Pomodoro, so it shows the total session time. Work/break transitions and the end of the session are announced by notifications. To see detailed progress, please open the app. 【Change】 Study records are now assigned to the start date instead of the end date. For example, if you start studying at 11:00 PM on Oct 3 and finish at 1:00 AM on Oct 4, the record will be assigned to Oct 3. ・Records that span midnight will not appear in the “Today” list on the Record tab. You can find them in the History tab under their start date. ・The “Date” field on the record screen is now labeled “Start Date & Time.” ・Existing timer records were saved with a date and time close to when the timer ended. If you want to correct the date of a record that spans midnight, open the record and edit its start date and time.

The developer, Nene Nakagawa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Provider
    Nene Nakagawa
    Size
    2.9 MB
    Category
    Education
    Compatibility
    Requires iOS 18 or later.
    • iPhone
      Requires iOS 18 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    English and 4 more
    • English, Japanese, Korean, Simplified Chinese, Traditional Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 Nene Nakagawa