You may wish to support the developer (Tom Schwarz) who made the app. They do not get paid but rely on gifts from supporters. They are a member of SIL.
Give on this link: https://pay.sumup.com/b2c/QU2YKZQY
You may prefer to support one of the sponsoring organisations:
For SIL, https://global.sil.org/give/https://global.sil.org/give/