What I learned trying to sell an app nobody has used

<p>This summer I built Starling, a Chrome extension that drafts replies, quote posts and posts on X in your own voice. It learns how you write from your old posts, and nothing goes out until you press Post. Behind it there's a FastAPI backend, Stripe billing, an owner dashboard and about 5,500 automated tests.</p> <p>Then I realized I don't want to run a subscription business: support, payments, s

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