Big Calculator & Currencies
Low Vision & Autism Friendly
Free · In-App Purchases · Designed for iPad
Big Calculator is a beautifully designed, fully accessible calculator with built-in currency converter. Built with accessibility at its core, it's perfect for low vision users, neurodivergent individuals, and anyone who wants a clearer, calmer calculating experience.
DESIGNED FOR LOW VISION
See every number clearly with features built specifically for visual accessibility:
Extra-Large Buttons — Massive touch targets that are easy to see and tap
Adjustable Font Size — Scale from 50% to 150% based on your needs
High Contrast Themes — 8 themes designed for maximum readability
Bold, Clear Numbers — Heavy font weights for better visibility
Minimal Clutter — Clean interface with no distracting elements
Large Currency Flags — Easy-to-identify currency symbols
DESIGNED FOR AUTISM & SENSORY SENSITIVITIES
We believe everyone deserves tools that work for them. Big Calculator includes thoughtful features for autistic users and those with sensory sensitivities:
Accessibility Profiles — One-tap presets for different needs:
Low Sensory: Reduced haptics, no sounds, minimal animations
High Visibility: Enhanced visual feedback, longer press confirmations
Focus: Simplified interface with confirmation dialogs to prevent mistakes
Customizable Sensory Controls:
Haptic intensity levels (Off, Gentle, Normal, Strong)
Optional button sounds
Reduce Motion option for minimal animations
Visual Feedback You Control:
Adjustable button highlight intensity
Active field indicators
Customizable feedback duration
Mistake Prevention:
Optional confirmation before clearing
Adjustable long-press timing
Clear visual indicators of current state
POWERFUL CALCULATOR
Extra-large buttons for easy tapping
Adjustable font sizes (50% to 150%)
Clean, distraction-free interface
Full calculation history
Support for basic operations (+, −, ×, ÷, %)
CURRENCY CONVERTER
90+ world currencies
Large, easy-to-read currency flags
Simple swap between currencies
Real-time conversion as you type
Remembers your preferred currencies
Works seamlessly with the calculator
BEAUTIFUL HIGH-CONTRAST THEMES
Choose from 8 carefully designed themes optimized for visibility:
High Contrast (default) — Yellow on black
Black & White — Maximum contrast
Blue & Yellow — Color blindness friendly
Pure Black & White — Clean and clear
Amber on Black — Reduces eye strain
Light Mode — Bright and readable
Classic iOS — Familiar and comfortable
Ocean Blue — Easy on the eyes
WHY BIG CALCULATOR?
We built Big Calculator because we believe accessibility shouldn't be an afterthought. Whether you have low vision, are neurodivergent, have motor difficulties, or simply prefer larger buttons — this app is designed with you in mind.
Every feature can be customized. Every setting can be adjusted. The app works exactly how you need it to work.
PRIVACY FIRST
No account required
No data collection
No ads
Works completely offline
Download Big Calculator today and experience a calculator that truly works for everyone.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
You can now support the developer. Thank you for your support!
The developer, Hassan Hattab, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hassan Hattab
- Size
- 17.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 17 or later.
- iPhone
Requires iOS 17 or later. - iPad
Requires iPadOS 17 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Big Tip USD 9.99
- Thank You USD 2.99
- Support The Developer USD 4.99
- Small tip USD 0.99
- Copyright
- © Hassan Hassan 2025