ShowUp: The attendance app that also handles the fees

Hi Product Hunt! I built ShowUp for the solo coach, tutor or teacher who runs everything themselves — the person keeping attendance in a spreadsheet and chasing fees over WhatsApp. The core idea is attendance-led billing: you mark who showed up, and a fee only falls due once every class in a cycle is attended. So bills explain themselves and never get argued, and a missed class never burns a paid one — it waits and earns a make-up. Fee reminders send themselves, in your voice. It imports from the spreadsheet you already keep, runs from your phone, and is trusted by real class centres today. From S$19/month, with a 60-day money-back promise instead of a free trial. Would love your feedback — especially from anyone who's tried to run classes on spreadsheets and messaging apps.