# Plottron vs 易历知食

The clearest difference is review sentiment: Plottron at 100% against 易历知食's 50%. Plottron also leads on price (Free vs $2.99). 易历知食's advantage is iOS requirement (9.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Plottron | 易历知食 |
| --- | --- | --- |
| 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** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 2 MB | 30 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Billy Lin](https://appshunter.io/developer/1037723648) | [家凤 施](https://appshunter.io/developer/1630290643) |

## 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


### 易历知食

[App page](https://appshunter.io/ios/app/id1645643948)

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

**In-app purchases:** none


## Frequently asked questions

### Is Plottron free?

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

### Is 易历知食 free?

易历知食 costs $2.99, with no in-app purchases.

### Do Plottron or 易历知食 have ads?

Neither Plottron nor 易历知食 shows ads.

### Which is updated more often, Plottron or 易历知食?

Plottron ships an update every 2 months, and 易历知食 every 2 months. Most recently, Plottron was updated on October 24, 2026 and 易历知食 on October 22, 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.*