Developer Builds Privacy-First Calculator That Stores No Data and Requires No Account

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Leon, the creator of Calculator Toolkit, built a browser-based tool designed to help users calculate tips, taxes, and bill splits at restaurants without requiring any account or data upload. The decision to run the calculator entirely locally — rather than saving history to a server — was initially treated as a minor feature but ultimately shaped the entire interface design. Because no calculation history is retained, the tool must display results clearly and immediately, pushing Leon to eliminate complexity rather than obscure it behind dashboards or saved states. He acknowledges that a local-only approach does not suit all products, particularly those relying on collaboration or historical data, but considers it the most straightforward choice for a single-use billing tool. Leon shared the project on DEV Community seeking feedback from other developers on which interface elements become most challenging when account features and saved state are removed.

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