I admin a Facebook group of over 30k teachers who share free resources for others to use. Formerly, I managed all resources on a spreadsheet, but quickly realized how NOT user friendly that is. I made a Glide app back in May for the group. Since our resources contain company curriculum-based stuff, I launched the app with email sign in required. It can be a headache sometimes trying to explain to some old school teachers that the PIN is NOT in fact a password for them to write down somewhere lol. Other than that, my experience has been super positive. I typically have about 23,000 active users a month.