How Can We Help?
Guides, answers, and troubleshooting for CalcBoard. Everything you need to get the most out of your multi-panel calculator.
Up and Running in Minutes
CalcBoard shows a guided tour on first launch. Here's what to expect and how to make the most of it.
Open the App
CalcBoard launches with two calculator panels ready to go. Start calculating immediately — no account, no sign-up, no setup required.
Switch Between Panels
Tap any panel card at the top of the screen to switch to it. Each panel keeps its own state, mode, and calculation history independently.
Change Calculator Modes
Long-press on the active panel to open the panel menu. Choose Basic, Scientific, Programmer, or Unit Converter. Each panel can run a different mode simultaneously.
Add More Panels
Tap the + button to add panels. Free users get 2 panels. Premium unlocks up to 8 simultaneous panels on screen.
Share Values Between Panels
With Premium, long-press a panel and select "Push to tray" to send a result to the shared value tray. Tap any tray value to paste it into another panel.
Everything CalcBoard Can Do
Detailed guides for every mode and feature. Tap into the full power of your multi-panel calculator.
Basic Calculator
Standard arithmetic with a full expression editor. The foundation of every panel.
- Build expressions with digits, operators, and parentheses
- Casio-style percentages (100 + 10% = 110)
- Cursor arrows to edit any part of an expression
- Undo and redo buttons
- AC clears all; CE clears last entry
- Arbitrary-precision decimal math (no rounding errors)
Scientific Mode
Advanced mathematical functions for students, engineers, and scientists.
- Trigonometric: sin, cos, tan (and their inverses)
- Logarithmic: ln (natural log), log base 10
- Exponential: e^x, 10^x, power (^)
- Roots: square root, cube root
- Constants: π (pi), e (Euler's number)
- Factorial (n!)
Programmer Mode
Binary, octal, decimal, and hexadecimal with bitwise operations.
- Switch between BIN, OCT, DEC, HEX input bases
- All four bases displayed simultaneously
- Bitwise AND (&), OR (|), XOR (^), NOT (~)
- Left shift (<<) and right shift (>>)
- Tap any base row to switch input to that base
Unit Converter
Instant conversion across 10 categories with 100+ units.
- Free: Length, Mass, Temperature
- Premium: Area, Speed, Time, Data, Volume, Energy, Pressure
- 100+ units across all categories
- Type a value and see results instantly
- Swap units with the arrow button
Shared Value Tray
Transfer results between panels without copying or retyping.
- Long-press a panel → "Push to tray"
- Tap a tray entry to paste into the active panel
- Tray shows value, source panel name, and timestamp
- Swipe entries to remove them
- Stores up to 50 values
Calculation History
Every calculation is saved automatically so you never lose a result.
- Scroll through past calculations
- Bookmark important results
- Add custom labels to entries
- Premium: Full-text search across all history
- Premium: Export history to CSV
Control Center Quick Launch
Add CalcBoard to your iPhone's Control Center for one-tap access from any screen.
- Open Settings on your iPhone
- Tap Control Center
- Scroll down and tap + next to CalcBoard
- Swipe down from the top-right corner to open Control Center
- Tap the CalcBoard control to launch instantly
Make It Yours
Open Settings (gear icon, top-right corner) to customize CalcBoard's look and feel.
Appearance
| Theme | Light, Dark, or System default |
| Color scheme | 8 color schemes Premium |
| Button style | 6 keypad styles Premium |
| Number format | Auto, US (1,234.56), or EU (1.234,56) |
Interaction
| Haptic feedback | Vibrate on every button press |
| Sound feedback | Key click sounds |
| Compact keypad | Smaller buttons, more display room |
| Fit to space | Auto-shrink buttons to fit available area |
Frequently Asked Questions
Quick answers to the most common questions about CalcBoard.
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CalcBoard is free to download and use. The free version includes basic calculator mode, 2 panels, 3 unit converter categories (length, mass, temperature), and the last 10 history entries. Premium is a one-time purchase of $2.99 — no subscriptions, no recurring charges. There are no ads in either version.
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Premium unlocks Scientific mode, Programmer mode, the full unit converter (10 categories, 100+ units), up to 8 simultaneous panels, the shared value tray, unlimited calculation history with search and CSV export, and all 8 color themes and 6 button styles.
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Open CalcBoard, go to Settings → Upgrade to Premium, and tap "Restore Purchases." Make sure you're signed into the same Apple ID used for the original purchase. Your premium features will be restored immediately.
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With Premium, long-press the active panel to open the panel menu, then tap "Push to tray." The current result appears in the shared value tray strip. Switch to another panel and tap the value in the tray to paste it into that panel's expression.
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Long-press on any panel card to open the panel menu. Under "Mode," choose Basic, Scientific, Programmer, or Converter. Each panel can run a different mode independently.
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The unit converter covers 10 categories with 100+ units: Length, Mass, and Temperature are free. Premium unlocks Area, Speed, Time, Data, Volume, Energy, and Pressure. Conversions happen instantly as you type.
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CalcBoard uses arbitrary-precision decimal arithmetic instead of standard IEEE 754 floating-point numbers. This means calculations are mathematically exact with no rounding errors. Most calculator apps use floating-point and show 0.1 + 0.2 = 0.30000000000000004. CalcBoard doesn't.
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CalcBoard is designed with privacy in mind. Your calculations are stored locally on your device and never leave it. No personal data is sent to our servers. Currency rates are fetched via a third-party API, but no user information is transmitted. Read our full privacy policy for details.
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Yes. Accessibility is a core requirement, not an afterthought. Every button and display has semantic labels for VoiceOver. CalcBoard supports dynamic text scaling up to 200%, meets WCAG 2.1 AA contrast guidelines, respects the system "Reduce Motion" setting, and uses minimum 48px touch targets throughout.
Common Issues & Fixes
Quick solutions for the most commonly reported issues.
Purchase Not Restoring
Ensure you're signed into the same Apple ID used for the original purchase. Go to Settings → Upgrade to Premium → Restore Purchases. If it still doesn't work, restart the app and try again. Contact support if the issue persists.
Currency Rates Not Updating
Currency rates require an internet connection. If rates appear stale, check your connection and switch to converter mode again. Rates are cached for 12 hours, so you may see a slight delay. The converter shows the last-updated timestamp.
Buttons Feel Too Small
Go to Settings and toggle off "Compact keypad height" and "Fit keypad to space." This gives buttons their maximum size. In landscape mode with multiple panels, buttons are inherently smaller due to limited screen real estate.
App Feels Slow
If you have many panels open (6+), try closing unused ones to free up resources. Long-press a panel and select "Remove panel" to close it. CalcBoard is optimized for 60fps but many concurrent panels use more memory.
Contact Us
Questions, feedback, or feature requests — we'd love to hear from you.
Privacy & Legal
Data requests, privacy questions, GDPR inquiries, or legal matters.
[email protected]We typically respond within 1–2 business days.