I am on 13 as well, strange. But I was sent a link to it and side loaded to my tablet and is working fine now. Greg KE4OOO tpcsvc.com@groups.io> wrote:

I too see the nanovna web app in the store, but it won't let me download it as it tells me it is for an older device. rtellason.com@groups.io> wrote:

Hello to the group and a very happy holiday to all, I am trying to find an app that will work on my android phone or tablet, the software in the wiki claims it is for an older version of the android O

I found this one on Amazon and was wondering if it was a good choice. https://www.amazon.com/AURSINC-NanoVNA-H-Vector-Network-Analyzer/dp/B07Z5VY7B6/ref=pd_aw_sim_hxwPM1_sspa_mw_detail_m_sccl_24/137-1

I was just going to post the same thing. Will be calling them Monday to see if they have them in stock. Greg Ke4ooo