Although this Wiki is helpful, the other day I was playing with this App and my Apex
Download For those who wan’t to try it for yourselves.
WebAuthn - FIDO2 Example_4.2.1_Apkpure.apk (4.4 MB)
In the app, is a handy little tool to send / share your phones NFC “sweetspot” with the developers, this info is not a lookup, but does / should show the user their phones sweetspot if the developers have the data.
Speaking of handy little tools
@hoker @Az_F 
@AnyOtherAppDevelopers 
@RyuuzakiJulio ?
This got me to thinking; and yes, I’m aware the idea is the easy part and the execution is the difficult part; that’s where @hoker with your experience developing BioCom , Vivokey Apex App and @Az_F with your ZINC app ( FYI - I just added ZINC as a watched word with a link to get the App @ https://www.patreon.com/AxelFougues/membership)
If I had the skills, I would do it myself…, but with your collective knowledge, would this be an easy app to develop?
Would it be worth approaching the App developers
play@hwsecurity.dev
The in app function is a manual select by the user on a position on their screen whilst you scan your Card/ fob / implant on the back.
could it work like an HF tune ( Although, I’m pretty sure it stops reading when it gets that successful read, but maybe it could detect the device position and save the last position of the reading location? Could the App identify your phone make and model etc. and this be shared (somewhere)
I’m not sure of how the best way to collect, share and display that info, but happy for discussion in this or it’s own thread.
Just planting the seed 
Thoughts?