Fluently

01The Full Story: From Tutorial Toy to First Paying Customer

Edmund Yong built Fluently solo over one weekend — a browser extension that translates a foreign-language YouTube video into native-language subtitles with one click, inside the player. It didn't start with a flash of inspiration; it started with a repeatable assembly line. He picked a dead-simple demo from a tutorial (Polyglot, Scrimba's little translation tool) as the seed, then used Claude to brainstorm that toy-grade demo up into something people would actually pay for. He chose translation because he first googled "complaints about YouTube's translation features" and found a wall of users trashing the official machine-translated subtitles and auto-dubbing as inaccurate and miserable to use. That single step confirmed two things at once: the pain is real, and he knew where the complainers hang out — which is your map for finding cold-start users. After launch he ran an honest post-mortem on his spend: $100 on Reddit ads bought 150K impressions, 400 clicks, 26 signups, and 5 paying customers — about $100 MRR, essentially breaking even with the ad bill. The revenue is tiny, but this is a high-quality specimen of the full path "tutorial side project → painkiller product → first paying customer," and the methodology is worth far more than this particular app.