# Calculus vs Think Harder

The clearest difference is in-app purchases: Calculus at none against Think Harder's 8. Calculus also leads on iOS requirement (12.4 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Think Harder sells 8 one-off in-app purchases. Calculus asks for nothing beyond the download.

## The numbers

| Metric | Calculus | Think Harder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.6 (5 ratings)](https://appshunter.io/ios/app/think-harder/id6797403145/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 222 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Giro Technology Ltd](https://appshunter.io/developer/1641128177) | [PIGGY PANDA INC](https://appshunter.io/developer/1543380589) |

## What reviewers say

### Calculus

[App page](https://appshunter.io/ios/app/calculus-math-geek/id6451258362)

**Features:** macOS Compatibility

**In-app purchases:** none


### Think Harder

[App page](https://appshunter.io/ios/app/think-harder/id6797403145)

This casual game challenges players with unique levels that require unconventional thinking. Solve tricky puzzles by tapping, dragging, and interacting with your device in unexpected ways to uncover hidden solutions.

**Highlights:** Unique handcrafted levels, Out-of-the-box solutions, Device-interaction challenges, Entertaining puzzles, Tricky solutions, Satisfying achievements

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Welcome Pack | $0.99 | one-time |
| MiniPack | $1.99 | one-time |
| Value Pack | $4.99 | one-time |
| No Ads | $6.99 | one-time |
| Popular | $9.99 | one-time |
| No Ads Pro | $14.99 | one-time |
| Saver | $24.99 | one-time |
| Premium | $49.99 | one-time |


## Frequently asked questions

### Is Calculus free?

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

### Is Think Harder free?

Think Harder is free to download, with in-app purchases available.

### Do Calculus or Think Harder have ads?

Neither Calculus nor Think Harder shows ads.

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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.*