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Heedy is self-hosted and open-source, allowing users to keep all data on their own hardware and audit the software, as emphasized in the README's privacy arguments against cloud services like PRISM and data selling.

The plugin system enables adding new integrations and visualizations with Python or JavaScript, making it adaptable to individual needs beyond pre-built assumptions, as stated in the philosophy section.

Built-in visualizations and Jupyter notebook integration via plugins allow for direct data analysis within the platform, demonstrated in the provided screenshots of sleep data and notebooks.

Dedicated plugins like Fitbit enable seamless import of fitness tracker data, addressing the fragmentation of personal metrics from sources like apps and wearables.