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TransektCount

A butterfly monitoring app for transect counters.
TransectCount supports the species-specific counting of butterflies per transect section according to the European Butterfly Monitoring Scheme method. It is meant for transect counters to ease registering butterflies and day-flying moth during transect surveys.

New in Version 5.1.5:
- Code improvements
- Remaining Java modules converted to Kotlin
- Name composition for exported files changed

Features:
- Data collection is based on a transect inspection.
- Databases refer to a transect and can be individually created and customised within the app with regard to metadata, transect sections and expected species.
- The app contains an internal list with many European species and has a prepared database for a transect section with the most common species to be expected in Germany as a starting point for direct use.
- Export of the current species list for later re-import by TransektCount or import by the complementary app TourCount.
- Separate counters for internal/external counting areas and separately for ♂-♀-indeterminate, ♂, ♀, pupa, caterpillar or egg.
- Results page with prepared presentation for transfer to the input mask of Butterfly Monitoring Germany (web.app.ufz.de/tagfalter-monitoring/).
- The results can be exported in formatted XLSX or CSV format, as well as in an SQLite database file (e.g. to transfer them to a PC, for easier reading in a spreadsheet program, or for further processing).
- The help contains detailed user instructions.
- TransektCount supports counting in German, English, French, Italian and Spanish language and provides locale species names in these languages.

Functions:
- Duplicate and delete transect sections.
- Editing the transect section lists (adding and deleting species and editing terms).
- Editor for metadata in preparation for an inspection.
- Counter page per section with scroll-down list for species selection.
- Species editor for annotation and bulk counter entries.
- Optionally, GPS support for an info to change the current section.
- The results page shows metadata, notes, totals and counting results per species and transect section.

Prerequisites:
The app requires permits for
- storage access for importing and exporting counting data, results, species lists or track data,
- preventing the sleep mode und
- (optionally) the GPS controlled signaling of the current transect section.

The device screen should have a minimum resolution of 1024 x 1920 pixels.
The app can be used with Android version 11 or newer.

Documentation is provided under:
https://github.com/wistein/TransektCount/tree/master/docs.

TransektCount is one of two apps for monitoring European butterflies.
The second app, TourCount, supports the species-specific and individually GPS-localised counting of butterflies on any walk in nature.

Both apps use the coding scheme of Karsholt/Razowski for European butterflies and thus contain only European butterfly pictures.

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 5.1.5 (515) suggested Added on Jul 31, 2026

    This version requires Android 11 or newer.

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

    Permissions
    • access location in the background
      This app can access location at any time, even while the app is not in use.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • android.permission.MANAGE_EXTERNAL_STORAGE
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.wmstein.transektcount.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log

  • Version 5.1.4 (514) - Added on Jul 19, 2026

    This version requires Android 11 or newer.

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

    Permissions
    • access location in the background
      This app can access location at any time, even while the app is not in use.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • android.permission.MANAGE_EXTERNAL_STORAGE
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.wmstein.transektcount.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log

  • Version 5.1.3 (513) - Added on Jun 30, 2026

    This version requires Android 11 or newer.

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

    Permissions
    • access location in the background
      This app can access location at any time, even while the app is not in use.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • android.permission.MANAGE_EXTERNAL_STORAGE
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.wmstein.transektcount.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log