# Plottron vs Diffraction Grating Calculator

The clearest difference is price: Plottron at Free against Diffraction Grating Calculator's $2.99. Plottron also leads on update cadence (every 2 months vs every 29 months). Diffraction Grating Calculator's advantage is iOS requirement (13 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Plottron is free to download; Diffraction Grating Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Plottron ships an update every 2 months, Diffraction Grating Calculator every 29 months. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Plottron | Diffraction Grating Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.8 (12 ratings)](https://appshunter.io/ios/app/plottron/id1037723649/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 29 months |
| Monetization | Free | — |
| Size | 2 MB | 1 MB |
| Requires iOS | 15.0 | **13** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Billy Lin](https://appshunter.io/developer/1037723648) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Plottron

[App page](https://appshunter.io/ios/app/plottron/id1037723649)

This application offers advanced 2D and 3D graphing capabilities for various function types, alongside a comprehensive scientific calculator. It supports implicit graphing, complex number visualization, and symbolic differentiation. The calculator includes user-defined variables, live evaluation, and probability density functions.

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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Diffraction Grating Calculator

[App page](https://appshunter.io/ios/app/diffraction-grating-calculator/id1413088894)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plottron free?

Plottron is free to download, with no in-app purchases.

### Is Diffraction Grating Calculator free?

Diffraction Grating Calculator costs $2.99, with no in-app purchases.

### Do Plottron or Diffraction Grating Calculator have ads?

Neither Plottron nor Diffraction Grating Calculator shows ads.

### Which is updated more often, Plottron or Diffraction Grating Calculator?

Plottron ships an update every 2 months, and Diffraction Grating Calculator every 29 months. Most recently, Plottron was updated on October 24, 2026 and Diffraction Grating Calculator on October 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*