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Kept Tools

About Kept Tools

Kept Tools brings practical generators and converters into one multilingual web app.

Our Mission

To provide fast, reliable, and privacy-first tools without intrusive ads or sending your data to remote servers.

Why browser-local

Philosophy

Designed for both developers and regular users, focusing on a clean interface without unnecessary distractions.

We continuously expand our collection of tools based on feedback and real-world developer needs.

Architecture

Built with modern web technologies including Next.js and Tailwind CSS, all processing happens entirely in your browser.

  • Domain → Application → Adapters → UI → App/Platform layering
  • No tool content leaves the browser; persistence is sanitized preferences only
  • CSP/nonce and hostile-content sanitization at rendering boundaries

Localization

Fully localized into 2 languages to ensure accessibility.

Supported locales: en, cs — design tolerates 35–45% longer strings without clipping.

Verifiable Boundaries

Kept Tools documents its browser-processing, storage, and hosting boundaries so privacy claims can be checked against product behavior.

Both locale catalogs validate, accessibility targets WCAG 2.2 AA, privacy boundary is covered by E2E canaries, and performance budgets are enforced per route.