I built this for my mum.
Her doctor told her to start tracking her blood pressure. She downloaded three apps. One made her answer 20 questions, then hit her with a $30/year paywall before she could even see what the app looked like. One wanted $7 a month. One locked the export behind "premium."
She just wanted to write down three numbers.
So I built her an app that does exactly that. Then I realised every person over 50 with a blood pressure cuff has the same problem. So here it is.