Hey Beni,
first I wanna thank you that you are sharing your APP.
I hope I will switch in the future.
The design is nice! But there is a little bit more work to do (sry my friend 
)
If I’m wrong I apologize in advance.
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Contacts: my list with 100k+ contacts was loading pretty fast. I was not expecting that! Well done! But, if I’m typing in the “CALLSIGN” field “HB9HNT” your name is coming everything fine. If im deleting now one letter, your name is not going away from the field. At this stage it make maybe no sense but if I was typing to fast and thougth it was you and I’m deleting then a letter and replacing the last letter by another (which is not in my database) your name remains with this new callsign.
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Clear all button: A button for clear all fields execpt frequency and mode would be nice. It could be possible to implement it if your a holding a few sec the “ACT”, “S2S” or “CHA” buttons.
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Always display on: I would also implement a switch for turing on the display all time.
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RST TX and RST RX predefined values: It would be cool if in these two fields its always written like “59” and if you click on them it gets auto deleted and you can add your own report.
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Filter for Sotawach spots: Okay this is now sophisticated whining. Atm I’m learning CW but I’m not using it. And also I’m not activating peaks with like 6m. A Filter for the Sotadata would be very nice.
Thx a lot Beni for your hard work!
73
Julian