A butterfly monitoring app for transect counters.
About this app
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 5.1.3: - Exported results in xlsx spreadsheet improved - Exported results in csv spreadsheet improved - Code improvements - Text corrections - Docs updated - Bugfix
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.
Licensed under Apache-2.0, by Wilhelm Stein.
What's New in v5.1.3
Imported from the F-Droid repository index.
Version history
Jun 30, 2026 · 27 MB · Android API 30–37 · code 513
Imported from the F-Droid repository index.
SHA-256 480159e075adb2d8657e62b9c1627800d5729eb66ba916fc84428340c07abe22
Jun 25, 2026 · 27 MB · Android API 30–37 · code 512
Imported from the F-Droid repository index.
SHA-256 bd7d3efabbdae0d30f8aec16594aa9c6fcc62b1adbf1e12c73dae7698d64460b
Jun 2, 2026 · 27 MB · Android API 30–37 · code 511
Imported from the F-Droid repository index.
SHA-256 9b801d2f04f0da26e0ed1615897e416d191a0cd5245c1691d64a6185e064e46a
Will it run on your device?
60%
- Targets newer Android builds, so legacy devices may be excluded.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
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How to roll back to an earlier version
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Source code
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App Information
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SHA-256 Hash
480159e075adb2d8657e62b9c1627800d5729eb66ba916fc84428340c07abe22
Signing certificate
61c8d3392e42d9c1f83233f2f1da1b367f443d37fc052aafd90fad21c6abf2e0
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