This sounds like a great application for a cloud CMS like Airtable or Knack. Knack especially, because you’d have the option of taking your ideas a few step further: A cloud portal for gym staff to see all check in’s, and look up each person and how many times they’ve entered, aggregated statics and graphs. Plus you could even assign each gym visitor a portal login or a simple unique id, which they can type into a quick lookup form at the display. The display will find the id and return one or many people assigned to that account. Touch a button next to their name to check in, and do it again to check out. I’m willing to bet this can also be done with a scanning system or even integration with Nexmosphere RFID tags to do a simple scan in/out by waving a card. Many more features and ideas beyond what I’ve mentioned here. Sorry for the late reply, but I saw the post in the weekly Intuiface email. Good luck!