Replying to @jackcarroll
what exactly does your app do, I can't tell from the landing page
Engineer Building: https://daygauge.com http://competedesk.com http://tenderlead.co.uk http://shvl.app https://fleetkeep.co.uk https://toolbound.dev
imagine lifecycle (tracks where you have been, what you have done and spent your time), apple health data, and insights from scientific research personalised to you.
Building like habits and experiments in there too so say you are trying to see if you are intolerant to a certain food or trying to stop vaping, you can track how your baseline levels have changed from when you started.
What kind of app are you thinking of building?