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A height-prediction subscription app turns teens’ curiosity into recurring consumer revenue.
about 1M total downloads · $35/year or $5/week
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Go Tall is a mobile height-prediction and habit-tracking app built by Michael, a 20-year-old NYU finance student at the time of the interview. He found a similar app listed for sale for around $20,000, remembered searching for height calculators as a teenager, then built a product that estimates adult height and offers habit features. The subscription was $35 yearly or $5 weekly, with freemium features. Users answer a detailed onboarding quiz; the paid prediction is the conversion hook, while sleep logging, meal scanning, stretches, and continued growth tracking support ongoing use. Michael displayed App Store Connect sales and a monthly new-user dashboard during the interview. He reported about 700,000 App Store downloads and a few hundred thousand Android downloads, roughly one million total, and average revenue near $100,000 per month. He made ten TikToks daily, found a working response format, recruited creators, then added paid ads. Revenue moved through about $3,000 and $10,000 monthly, reached roughly $30,000 in month five, and later exceeded $100,000 monthly.
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Join the Unicorn Club — $5/moCancel anytime, in one clickData credibility: Michael reports average revenue near $100,000 per month and about one million downloads. During the interview he displayed App Store Connect sales and a monthly user dashboard, which supports the revenue claim as dashboard-backed hard data. The transcript does not establish audited net income, Android revenue detail, or independent verification of the displayed dashboard.
9 more sections — how the first customers came, how the first dollar landed, what turned the flywheel, and how they got through the silent stretch. Members read all of it.
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