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Developer Builds Open-Source Portfolio Risk Tracker Using EODHD API

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A developer has released Vault, a free open-source portfolio analytics tool built with React 19, Vite, and the EODHD market data API. The tool calculates six institutional-grade metrics — including Sharpe ratio, beta, maximum drawdown, and a Pearson correlation matrix — that standard retail apps and spreadsheets typically omit. Unlike paid portfolio trackers, Vault runs entirely in the browser with no backend server, storing all portfolio data locally in the user's own browser via localStorage. The project was motivated by the gap between the risk-analysis tools available to institutional investors and the basic pie charts offered to retail investors. All financial formulas are implemented from scratch in a single JavaScript utility file, with no reliance on external statistics libraries.

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