Just use a spreadsheet and avoid vendor lock in.
Use one of the apps below, and then mostly you can then reuse that spreadsheet in any of the others listed.
Microsoft Excel, Google Spreadsheets, Numbers (on Mac), LibreOffice Spreadsheets, OpenOffice Spreadsheets
The problem with "apps" is that when the vendor pulls the plug, you are left with nothing, no updates no support etc... and worse, if you wipe your phone/tablet and the app is no longer in "the store" then you cannot reinstall it and therefore cannot access your logbook records!
So, advice, use a low technology solution, like a spreadsheet, that can be opened in any major free (or commercial) spreadsheet application.