# Plot Calculator vs Chelsea World School

The clearest difference is update cadence: Plot Calculator at every 2 months against Chelsea World School's every 7 months. Plot Calculator also leads on iOS requirement (10.2 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Plot Calculator ships an update every 2 months, Chelsea World School every 7 months. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Plot Calculator | Chelsea World School |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Size | 13 MB | 223 MB |
| Requires iOS | **10.2** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oklahoma State University](https://appshunter.io/developer/393442180) | [Sanjan Piya](https://appshunter.io/developer/1503313696) |

## What reviewers say

### Plot Calculator

[App page](https://appshunter.io/ios/app/plot-calculator/id1246269450)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chelsea World School

[App page](https://appshunter.io/ios/app/chelsea-world-school/id6633425266)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plot Calculator free?

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

### Is Chelsea World School free?

Chelsea World School is free to download, with no in-app purchases.

### Do Plot Calculator or Chelsea World School have ads?

Neither Plot Calculator nor Chelsea World School shows ads.

### Which is updated more often, Plot Calculator or Chelsea World School?

Plot Calculator ships an update every 2 months, and Chelsea World School every 7 months. Most recently, Plot Calculator was updated on October 16, 2026 and Chelsea World School on October 8, 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.*