Claude to build a local family ending note

Tax accountant Tamaki wanted a family ending note that could hold more than a list of assets. Using Claude Code, the nonengineer built a web app in roughly half a day to record family information, medical and funeral wishes, and material for thinking about inheritance and asset division.

The app used React, TypeScript and Vite, with records stored through the browser's localStorage. It included an inheritance estimate and division-fraction simulation. Allocation controls offered equal, statutory and remainder-based approaches, while warnings highlighted unassigned shares or totals above one hundred percent.

Tamaki checked calculations against a published National Tax Agency example involving a hundred-million-yen estate, a spouse and two children. That is a reported self-check, rather than independent validation of a legal or tax calculator. The source does not describe this app filing an inheritance return or settling a family's estate.

A particularly practical request was to package the app as one HTML file with its JavaScript and styles included. That produced an offline artifact which could open by double-clicking and be shared on a USB drive. Local record storage describes the app's architecture; it does not establish what information was sent to the coding model during development. The case is useful as a portable family-record organizer, with calculation checks and legal decisions remaining separate responsibilities.

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Source: note.com · 税理士たまき (@m_tamaki)