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Become a sponsor to OpenDocument Reader
OpenDocument Reader opens ODF files — text documents, spreadsheets, presentations — on Android and iOS. The free edition and the paid edition are the same app with the same features; the paid one just drops the ads.
The rendering engine underneath, OpenDocument.core, is open source C++ that anyone can build on.
Sponsoring pays for the parts nobody buys: work on the rendering core, the Apple and Google developer fees, and the CI that keeps both apps shipping.