Run independent calculations side by side. Compare results, share values between panels, and switch between four calculator modes — all without leaving the app.
Features
No other calculator lets you run multiple independent panels simultaneously with shared state. CalcBoard does.
Open up to 8 calculators at once. Each panel runs independently with its own mode, history, and state. Compare prices, run scenarios, or check homework — in parallel.
Push a result from one panel to the tray and pull it into another. Transfer values between panels instantly — no copying, no retyping.
Basic, scientific, programmer, and unit converter. Each panel picks its own mode. One app handles every type of calculation you'll ever need.
Every result is saved automatically. Bookmark, label, search, and export your history to CSV. Never lose a calculation again.
Arbitrary-precision math — not IEEE 754 floats. 0.1 + 0.2 = 0.3 exactly, every time. No rounding errors, no surprises.
Full VoiceOver & TalkBack support, WCAG AA contrast, dynamic text scaling to 200%, 48px touch targets, and reduce-motion support. Built for everyone.
Calculator Modes
Set each panel to its own mode. Basic math in one, scientific in another, programmer in a third.
Standard arithmetic with full algebraic expression editing.
Trigonometric, logarithmic, and exponential functions.
Binary, octal, decimal, hex with bitwise operations.
Real-time conversion across 10 categories with live currency rates.
How It Works
Two panels are ready immediately. Start calculating with zero setup or sign-up.
Long-press any panel to switch between Basic, Scientific, Programmer, or Converter.
Work on multiple calculations at once. Each panel is fully independent.
Push values to the shared tray and pull them into any panel with one tap.
Use Cases
Standard calculators force you to juggle one problem at a time. CalcBoard doesn't.
Two stores, two panels, instant comparison
Multiple problems visible simultaneously
Convert and calculate in parallel panels
Compare loan scenarios side by side
Hex and binary alongside decimal math
Materials, measurements, and costs at once
Pricing
Pay once, own it forever. CalcBoard will never show you an ad or charge a recurring fee.
2 panels, basic mode, 3 converter categories, last 10 history entries. No ads. No time limits. No catch.
| Feature | Free | Premium |
|---|---|---|
| Basic calculator | ✓ | ✓ |
| Scientific mode | — | ✓ |
| Programmer mode | — | ✓ |
| Unit converter (basic) | ✓ | ✓ |
| Unit converter (full 10 categories) | — | ✓ |
| Simultaneous panels | Up to 2 | Up to 8 |
| Shared value tray | — | ✓ |
| Calculation history | Last 10 | Unlimited + search |
| History export (CSV) | — | ✓ |
| Color themes & button styles | — | ✓ |