Developer builds photo-based body fat estimator that deletes images after one scan

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A developer has launched realbodyfat.com, a tool that estimates body fat percentage, lean mass, and fat mass from a single uploaded photo in roughly ten seconds. The site was built as a middle ground between informal mirror guesses and expensive DEXA scans, which can cost around $150. Privacy was a core design constraint: uploaded photos are processed once through a vision model and never stored to disk or used for training, with no user accounts required. The architecture runs on Astro and Cloudflare Workers, with a Durable Object system handling credit wallets for users who purchase scan packs without needing a user database. The tool offers one free scan per day and acknowledges its limitations, noting that photo-based estimates are least reliable for very lean or very muscular individuals and recommending trend-tracking over time rather than relying on any single reading.

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ProgrammingDEV Community ·

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