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eLektron

Timetable, substitutions and news for ZSE Bydgoszcz - no login, works offline.
New in version 1.0.2
Commute (formerly Departures): to school in the morning, home after lessons, live delays.
Days off: no reminders or live notification on holidays and breaks.
School notice notifications.
New Settings with categories, custom background colour.
Time left until lessons end on the home screen and widget.
Several groups of one subject.
Live notification: current progress, status bar countdown (Android 16+).
Unofficial app for students of the Zespół Szkół Elektronicznych (school of electronics) in Bydgoszcz, Poland. It reads the school's public websites directly - no login and no personal data collected. Works offline.

Features

  • Daily and weekly timetable with substitutions applied; the current lesson shows the time left

  • Class groups: only the lessons you attend (languages, workshops, PE, religion), including several groups of one subject

  • Substitutions for your class and group, including cancelled lessons, plus notices the school adds under a date (e.g. blood donation)

  • Notifications about new substitutions (day, lesson, subject and teacher), news and school notices, quiet hours

  • Days off: no reminders or live notification on holidays, breaks and winter break

  • Live notification on school days: countdown to the break or the next lesson, what is on now and next, when lessons end (optional)

  • Notes for upcoming lessons with a reminder the day before or before the lesson

  • Lesson reminders with the room number

  • School news read in the app, with photos, search and favourites available offline

  • Home screen with the current or next lesson, breaks, substitutions and time left until lessons end

  • Widgets: Next lesson, Day plan, Substitutions, plus a quick settings tile

  • Commute: in the morning buses and trams to your next lesson (time to spare, last one that makes it), after lessons the way home (when to leave), live delays, without GPS (optional)

  • Custom subject names and colours, light and dark theme, accent colour, ready-made or custom background colour, wallpaper colours, app icon choice



The app's interface is in Polish. Not affiliated with the school or VULCAN. Inspired by Atom (iOS) by Kacper Górka. Free software under GNU GPL v3 or later.
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 1.0.2 (38) suggested Added on Oct 27, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 8.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • android.permission.POST_PROMOTED_NOTIFICATIONS
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • pl.zse.bydgoszcz.elektron.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.1 MiB PGP Signature | Build Log

    • New in version 1.0.1
    New: live notifications (Settings → Notifications) count down to the break or the next lesson on school days, with what is on now and next.
    New: school notices from the substitutions page (e.g. blood donation).
    Next lesson widget: "in X min" at every size and the following lesson.
    Opening the app refreshes substitutions at once; widgets change at the bell.
    Lessons your class is freed from are no longer shown as ongoing.
    Timetable and reminder fixes.
  • Version 1.0.1 (37) - Added on Oct 25, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 8.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • android.permission.POST_PROMOTED_NOTIFICATIONS
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • Schedule precisely timed actions
      This app can schedule work to happen at a desired time in the future. This also means that the app can run when you're not actively using the device.
    • Schedule alarms or event reminders
      This app can schedule actions like alarms and reminders to notify you at a desired time in the future.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • pl.zse.bydgoszcz.elektron.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4 MiB PGP Signature | Build Log

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