# Plottron — 3D graphing calculator

> Advanced 2D/3D graphing calculator with scientific and symbolic computation features. (iPhone/iPad app by Billy Lin.)

- Source: https://appshunter.io/ios/app/plottron/id1037723649 (this page in markdown: same URL + `.md`)
- Developer: [Billy Lin](https://appshunter.io/developer/1037723648)
- Category: Utilities
- Price: Free
- Rating: 4.80/5 from 11 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: American English, French (France), Japanese, Chinese (Simplified, China)
- Released: 2015-09-21
- Data updated: 2026-07-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/plottron/id1037723649/reviews.md

## What is Plottron?

A graphing + scientific calculator.

-2D and 3D graphing
Graphs regular functions, parametric relations, and functions in polar/spherical coordinates.
-Implicit graphing
-Visualization of complex maps w=f(z) featuring domain coloring plots
-For 2D functions: Info mode with tangent line and 2nd-order Taylor approximation

Scientific calculator features:
-User-defined variables and functions
-Symbolic derivative (e.g.: D(x, sin(x)) 
-nCr, nPr, factorial
-Complex numbers
-Live evaluation (calculate as you type)
-Calculation history
-Probability density functions: Binomial, Normal (Gaussian)

Examples:
Implicit graph: cos(X)=sin(Y)
Graph a parabola in Regular mode: X^2
Graph a circle in Parametric mode: cos(T);sin(T)
Set a variable: X=5
Use a variable: X+4: 9
Define a function: f(X)=X+1
Use a defined function: f(2): 3
Symbolic derivative: D(X,sin(X)): cos(X)
Complex magnitude plot in 3D Regular mode: abs(1/cos(X+Yi))

Notes:
-Swipe left for settings.
-Use semicolon (;) to separate functions in parametric relations.
-Swipe down on keypad to show full history. Tap on answer to show keypad again.

## Key features

- 2D and 3D graphing
- Implicit graphing
- Complex number visualization
- Symbolic differentiation
- User-defined variables and functions
- Live evaluation
- Calculation history

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/plottron/id1037723649/reviews.md

### 5/5 — Amazing complex function graphing

*2026-05-09, version 1.8.8*

Yes

### 4/5 — Factorial should be implemented as Gamma

*2026-03-23, version 1.8.7*

Looks like a splendid program.  A minor tweak is that the factorial function returns the wrong answer for negative numbers.  Implementing this as Gamma(Z-1) should fix.

### 5/5 — Best calculator app

*2023-06-09, version 1.7.4*

This is the best calculator app out there. Really love the dark mode skin too.

### 4/5 — Great graphing calculator

*2020-08-30, version 1.7.1*

Very helpful, only complaint so far is it doesn’t work in horizontal

### 5/5 — Useful calculator

*2019-12-29*

Really good app, simple to use. Does what you need it to do and is easy to navigate

### 5/5 — Simply amazing!

*2016-09-26, version 1.2.3*

This is by far the best free graphing app on the App Store. There are no hidden fees and I haven't seen any ads yet. I would highly recommend this app to anyone.

### 5/5 — Most beautiful app in the store hands down.

*2015-10-07, version 1.0.1*

Best graphing calculator for on the go calculations. Simple and effective.

## Frequently asked questions about Plottron

### What kind of graphs can Plottron create?

Plottron can graph regular functions, parametric relations, and functions in polar/spherical coordinates. It also supports implicit graphing and visualization of complex maps w=f(z) with domain coloring plots.

### What are the key scientific calculator features of Plottron?

Plottron includes user-defined variables and functions, symbolic differentiation, nCr/nPr calculations, complex numbers, live evaluation, calculation history, and probability density functions like Binomial and Normal (Gaussian).

### How does Plottron handle parametric relations?

For parametric relations, you can use a semicolon (;) to separate functions. This allows for graphing curves defined by two or more functions, such as circles or ellipses.

### Can I use variables and define my own functions in Plottron?

Yes, Plottron allows you to define user-specific variables and functions. You can then use these defined variables and functions in your calculations and graphs, making it highly customizable.

### Is Plottron available on multiple devices?

Plottron is supported on iPhone, iPad, and iPod, making it accessible for users across various Apple devices. Its interface is designed to adapt to different screen sizes.

### How often is Plottron updated?

The latest version of Plottron is 1.8.8, which was last updated on March 27, 2026. This indicates a commitment to ongoing development and feature enhancements.

### What is the age rating for Plottron?

Plottron has an age rating of 4+, making it suitable for a wide range of users, including younger students. The app's content is generally considered appropriate for all ages.

### Does Plottron have ads?

No, Plottron does not contain advertisements. It is a completely ad-free application, ensuring an uninterrupted user experience for all its features.

## Version history (last 5 releases)

### 1.8.8 — 2026-03-27

-New factorial (gamma) function that supports negative numbers (non-integers) 
-Issue fixes

### 1.8.7 — 2025-05-18

Faster Binomial probability density function
Fixed Binomial PDF function domain

### 1.8.6 — 2025-05-08

Issue fixes

### 1.8.5 — 2025-05-07

Added new functions:
- gcd, lcm (greatest common divisor, least common multiple)
- binpdf, normpdf (binomial/Normal probability density functions)

### 1.7.9 — 2024-12-16

Issue fixes

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## Related topics

[plottron](https://appshunter.io/ios/topics/plottron) · [3d graphing calculator](https://appshunter.io/ios/topics/3d-graphing-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*