“My biggest expense is RevenueCat right now because they take 1% of my revenue, so depending on the month that can be a lot, but it's totally worth it. The rest adds up to roughly $200 or $300 per month.”

Run lean enough to outlast the slow months — $200–300/month plus 1% to RevenueCat

Keeping fixed costs at a couple hundred dollars a month means revenue almost entirely converts to profit. A solo operator with minimal overhead can absorb slow months and still compound over years — and a revenue-share tool like RevenueCat is worth the 1% if it saves you from rolling subscription infra.