i looked again at what @dxy99999 has done to show me apps - the usage limits on shinyapps.io are ok actually:
https://support.rstudio.com/hc/en-us/articles/217592947-What-are-the-limits-of-the-shinyapps-io-Free-plan-
problem is that you can only have 5 apps at a time. but we could have a rotating 5 apps that we currently talk about - having them online would make access easier.