Quanta universel converter

Quanta is a universal unit converter, designed as a modern precision instrument — somewhere between editorial calculator and field notebook.

255 units across 25 categories cover the essentials and the unexpected: length, mass, temperature, area, volume, time, speed, pressure, energy, power, force, angle, data, fuel economy, cooking, frequency, torque, density, flow rate, illuminance, magnetism, radioactivity, acceleration, electricity, and numeral bases (binary, octal, hex, roman).

ABSOLUTE PRECISION
Calculations run in BigDecimal with 50 significant digits, sourced from NIST SP 811 and BIPM official factors. From Planck length (1.6×10⁻³⁵ m) to solar mass (1.99×10³⁰ kg), zero floating-point drift.

TACTILE, IMMEDIATE
Custom keypad (never the system keyboard). One-gesture swap on the ⇅ chevron. Long-press the "To" card to pin a conversion.

OFFLINE BY DEFAULT
No network required. No tracking. No ads. No third-party services.

BILINGUAL EN + FR
Auto system-language detection and manual override. Derived dark mode for late sessions.

LOCAL PERSISTENCE
Favorites, conversion history (500 entries), recent searches, and preferences survive restart.

CUSTOMIZABLE
Light/Dark/Auto theme, 5 accent colors (burnt amber, ink blue, forest green, plum, ink), 0–10 decimals, auto scientific notation, FR "1 234.56" or EN "1,234.56" separator, haptic feedback.