neo Calc
Launch App
Offline-First PWA

Fast. Precise.
Completely Uncluttered.

One app, built for your daily life.
No ads, zero load times, no switching apps.

Why neo Calc?

Designed to eliminate daily utility friction and app switching.

Standard mobile calculators usually fail in one of two ways: they are either stripped-down basic utilities that force you to download extra apps the moment you need a unit conversion, or overly bloated interfaces filled with ads, subscription popups, and sluggish menus.

neo Calc eliminates that friction.
Lightweight, offline-first, it brings every tool you need into one fluid, quiet interface that lives natively on your home screen.

What You Get

Built around speed, accuracy, and uninterrupted focus.

Uninterrupted Workflow

Jump between regular calculator, mortgage amortization, currency and units conversions, without losing active calculations or hunting through clunky submenus.

100% Offline & Private

Zero internet dependency for core operations, zero tracking scripts, zero telemetry, and zero ad clutter.

Ergonomic Adaptability

Transitions dynamically between portrait touch targets and wide landscape for maximum thumb comfort.

Error-Free Verification

Dynamic multi-line expression displays and step-by-step evaluation history ensure you never lose context on complex inputs.

Core Functionalities

10 integrated modes designed to cover every calculation requirement.

Daily calculator
Basic Arithmetic
Responsive primary keypad featuring live parenthetical parsing, responsive auto-scaling fonts, and quick percentage evaluation.
Debt planning
Loan & Mortgage
Instant payment estimation, total interest breakdown, and full interactive amortization tables for property and credit planning.
Body Mass Index
BMI & Health Evaluation
Metric and imperial Body Mass Index evaluation with visual category markers and healthy range targets.
Convert everything to anything
Unit Converter
13 physical measurement categories including length, mass, temperature, pressure, speed, and volume with dual-way conversions.
Currency (online)
ECB Currency Exchange
Live synced European Central Bank (ECB) exchange rates cached locally for reliable offline access during international travel.
% without formulas
Percentage & Tip Utilities
Dedicated percentage modes for rapid margin calculations, percent difference, and tip percentages.
Engineering tools
Scientific Calculator
Full trigonometric suite (Deg/Rad toggle), natural logarithms, powers, roots, etc.
Decimal to Binary? No problem!
Programmer & Bitwise
Simultaneous DEC, HEX, OCT, and BIN displays with bitwise logic (AND, OR, XOR, shifts) and word-size masking (Byte to QWord).
How many days have you lived?
Date & Time Offset
Calculate duration intervals between dates or add/subtract business days, hours, and minutes with localized calendar formats.
History tally
Evaluation Tape & Memory
Scrollable calculation history tape allowing past values to be recalled, copied, or inserted directly back into active expressions.

Technical Specifications

Architecture and customization details for power users.

Platform & Engine Offline-first Progressive Web App (PWA) with installation support and zero network dependency.
Viewport & Layout Responsive dual-pane CSS grid with dynamic auto-scaling font sizes for portrait and landscape.
Display Themes Seamless dark, light, and system-default theme modes with high-contrast accessibility compliance.
Formatting & Separators Customizable decimal and thousands separators.
Localization Configurable decimal precision, currency symbol, and date format.

Ready for a Better Calculator?

No app store downloads required. Install directly from your browser in seconds.

Launch neo Calc Now