SigiCalc
RPN Graphing Calculator
Free · Designed for iPad. Not verified for macOS.
RPN Graphing Calculator
SigiCalc is a fast, clean RPN calculator that draws your functions.
Enter a calculation the RPN way – numbers first, then the operation – and as soon as your expression contains X, tap Graph to see it plotted. No equals key, no parentheses, no fuss.
REAL RPN
• Classic stack-based entry with Enter, Undo and All Clear
• Keys light up only when the stack has enough values – you can't make an invalid entry
• The display shows your result, the whole expression in normal notation and the raw stack
LIVE FUNCTION GRAPHS
• Use X as a variable and plot the result instantly
• Pinch to zoom, drag to pan, tap to zoom in, double-tap to reset
• Touch and hold to read the exact x / y value on the curve
• Discontinuities like tan(x) or 1/x are drawn correctly – no misleading vertical lines
SCIENTIFIC FUNCTIONS
sin, cos, tan and their inverses, natural log, square, square root, reciprocal, sign change and π
DESIGNED FOR TODAY'S DEVICES
• Light and Dark Mode, portrait and landscape
• iPad: calculator and live graph side by side
• Smooth animations and haptic feedback
PRIVATE BY DESIGN
SigiCalc works entirely on your device. No account, no network, no ads, no tracking.
Example: X ↲ X sin × plots x · sin(x).
What changed versus your text and why:
- Leads with a benefit, not a category: "draws your functions" is the hook; "simple and practical graphical" told the reader nothing they'd search for.
- Explains RPN in one sentence for people who don't know it, since that's the biggest reason someone bounces.
- Bulleted feature blocks — App Store descriptions are skimmed, and the capitalised headings scan well in the store's plain-text rendering.
- Adds Dark Mode / iPad / privacy, all of which are new in 3.0 and are things reviewers and users look for.
- Fixed "polish" → "Polish" and "equation" → "expression" (you plot expressions, not equations).
SigiCalc is back with a completely new look.
- Brand-new design: frosted glass display, colourful keypad, smooth animations and haptic feedback
- Dark Mode and landscape support
- iPad: calculator and live graph side by side
- Graph: pinch to zoom, drag to pan, tap to zoom in, double-tap to reset, hold to read x/y values
- New app icon
- Fixed number entry quirks (leading zeros, ±0, undo)
- Requires iOS 17 or later
The developer, Siegware, 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
- Siegwart Software
- Size
- 3.2 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 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+
- Copyright
- © 2026 Siegwart Software