I have recently built a subscription manager app and launched it on iOS and Android.
If you’re interested in my struggles and learnings, feel free to read my featured how-to blog post on Hackernoon here
If you’re interested in what the app looks like, find Memoly in the app stores (it’s completely free).
I also just launched a detailed, hands-on course on Udemy where I teach students how to create such an app and integrate it with Zapier, Airtable and Gmail. Feel free to check it out here.
Happy to hear your feedback!