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// A calculator that feels like science

All-in-one.
Zero clutter.

Built for people who want more than just basic math. Whether you're splitting a bill, converting units, checking live exchange rates, or crunching trig functions — Precision handles it all from one sleek dark-themed interface.

Download Latest APK All Releases

Flutter 3.x

Android 5.0+

No ads. Free.

… releases

⭐ …

… forks

Currencies

36+

Latest

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// Four Modes, One App

Everything you need.
Nothing you don't.

A single dark-themed interface with four full-featured calculators. Responsive layout that adapts between bottom navigation on mobile and top tabs on wider screens.

01 / 04

🔢

Basic Calculator

Addition, subtraction, multiplication, division, percentage, and sign toggle — the essentials done right. Live expression preview lets you see exactly what you're typing before you hit equals. Full calculation history so you can scroll back and pick up where you left off.

Live previewHistory+ − × ÷% ±

02 / 04

🧪

Scientific Calculator

Full scientific suite with trig (sin, cos, tan + inverses), logarithms (ln, log), powers, roots, and the constants π and e built right in. Switch between Degrees and Radians with one tap. Supports parentheses for complex nested expressions, factorials, absolute values, and random number generation.

sin cos tanasin acos atanln logπ ex² x^y √ e^x 10^xDeg / RadFactorial |x|

03 / 04

📏

Unit Converter

Five unit categories with comprehensive coverage. Swap units instantly and see a quick-reference grid of six related conversions at a glance. Length (mm–miles), Area (mm²–mi², hectares, acres), Volume (mL–ft³, gallons, pints, cups), Mass (mg–metric tons, stones), Speed (m/s, km/h, mph, knots).

LengthAreaVolumeMassSpeedmm → milesmg → metric tonsmL → gallonsm/s → knots

04 / 04

💱

Currency Converter

Live exchange rates for 36+ world currencies via the Free Currency API. Searchable picker with country flags, auto-refreshing rates with a configurable interval, and a last-updated timestamp with live connection status (online / offline / error). Swap currencies with one tap.

Live rates36+ currenciesOnline / Offline statusUSD EUR GBP JPY CAD AUD CHFCNY INR KRW SGD HKD THB IDRAED SAR ZAR NGN KES TZS UGXMXN BRL NOK SEK DKK RUB

// Settings & Design

Thoughtful in every detail.

🌙

Dark-First Design

Material Design 3 with a vibrant green (#78DC77) accent palette, smooth rounded corners, and subtle gradients throughout every screen.

✏️

Curated Typography

Manrope for display text, Inter for body copy — a carefully chosen pairing that feels precise, readable, and consistent at any size.

🎬

Animated Splash Screen

A polished launch animation that sets the tone before you've tapped a single button.

🎛️

Decimal Precision Control

Choose how many decimal places to display (default: 6). Toggle scientific notation for very large or very small results.

📳

Haptic Feedback

Feel every button press with tactile feedback — or disable it entirely. Your preference is persisted automatically.

🔢

Thousands Separator

Comma separators enabled by default, making large numbers instantly scannable at a glance.

📡

Currency Auto-Refresh

Set your preferred currency rate refresh interval. A status indicator tells you whether you're seeing live or cached data.

📱

Responsive Layout

Bottom navigation on mobile, top tabs on wider screens. The layout adapts seamlessly — it always feels native.

🕓

Calculation History

Your full calculation history is always one scroll away. Pick up exactly where you left off, every time.

// Tech Stack

Built on solid foundations.

Framework

Flutter · Dart

99.9% Dart · v3.x

State Management

Riverpod

Reactive providers

Math Engine

math_expressions

Full expression parser

HTTP Client

http

Network requests

Persistence

shared_preferences

Local settings storage

Typography

Google Fonts

Manrope · Inter

Formatting

intl

Numbers & dates

Currency API

Free Currency API

Live exchange rates

// Open to Tinker

Build it yourself.

Flutter 3.x + Android SDK (API 21+). Clone, get dependencies, run. For live currency rates, grab a free API key from freecurrencyapi.com and add it to lib/constants/api_keys.dart.

# Clone the repo
git clone https://github.com/jayshivram/Precision.git
cd Precision

# Install dependencies
flutter pub get

# Run in debug mode
flutter run

# Build a signed release APK
flutter build apk --release

All-in-one.
Zero clutter.

Everything you need.
Nothing you don't.

Thoughtful in every detail.

See it. Feel it.

Built on solid foundations.

Always up to date.

Build it yourself.

Math deserves
good design.

Built by people.

All-in-one. Zero clutter.

Everything you need.Nothing you don't.

Thoughtful in every detail.

See it. Feel it.

Built on solid foundations.

Always up to date.

Build it yourself.

Math deservesgood design.

Built by people.

All-in-one.
Zero clutter.

Everything you need.
Nothing you don't.

Math deserves
good design.