# Plot Calculator vs Parent App by PlanetSpark

The clearest difference is iOS requirement: Plot Calculator at 10.2 against Parent App by PlanetSpark's 15.6. On price, update cadence, ads and in-app purchases 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, Parent App by PlanetSpark every 6 weeks. The most recent releases landed on October 8, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Plot Calculator | Parent App by PlanetSpark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Size | 13 MB | 55 MB |
| Requires iOS | **10.2** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oklahoma State University](https://appshunter.io/developer/393442180) | [Kunal Malik](https://appshunter.io/developer/1610156743) |

## What reviewers say

### Plot Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Parent App by PlanetSpark

[App page](https://appshunter.io/ios/app/parent-app-by-planetspark/id6748634068)

**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 Parent App by PlanetSpark free?

Parent App by PlanetSpark is free to download, with no in-app purchases.

### Do Plot Calculator or Parent App by PlanetSpark have ads?

Neither Plot Calculator nor Parent App by PlanetSpark shows ads.

### Which is updated more often, Plot Calculator or Parent App by PlanetSpark?

Plot Calculator ships an update every 2 months, and Parent App by PlanetSpark every 6 weeks. Most recently, Plot Calculator was updated on October 8, 2026 and Parent App by PlanetSpark on September 29, 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.*