Solo developer builds open-source sports analytics SaaS to replace coaches' clipboards

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Jonas, a developer with a CS and Entrepreneurship background, is publicly documenting the solo development of SportsFlow, a sports analytics platform aimed at amateur coaches. The app allows coaches to live-track shots, assists, and saves during handball games on a phone or tablet, generating season-level analytics such as heatmaps and shooting percentages. Jonas identified the problem firsthand from his time on the bench, noting that in-game data is routinely lost once the final whistle blows. The platform is being built offline-first to handle poor connectivity in sports halls, with plans to expand beyond handball to volleyball, basketball, and ice hockey. Jonas intends to publish biweekly build-in-public updates covering both technical decisions and honest business trade-offs.

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