Really excited to hit my next big milestone toward becoming a profitable Indie company.
I added "Plus" subscriptions ($2.99/mo or $24.99/yr) last year in May and it's been steady, linear growth since then. Adding a new feature here and there seems to give it the occasional bump. Most recently that was a data export feature.
My total costs are around $200/mo and the rest of the funds are put into App Store Search Ads to keep our search rankings competitive.
Recently added some more in-app ques to encourage older users to sign up for Plus at high points in the experience. I'm hoping it will be a pleasant surprise and boost the growth rate a bit!