# Calculation Time vs Prism

The clearest difference is in-app purchases: Calculation Time at none against Prism's 1. Prism's advantage is ads (none vs shown) and device support (3 vs 1). On price and iOS requirement there is nothing between them.

Both are free to download. Prism sells 1 one-off in-app purchase. Calculation Time asks for nothing beyond the download.

## The numbers

| Metric | Calculation Time | Prism |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 42 months | — |
| Size | 5 MB | 27 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mert Cilli](https://appshunter.io/developer/1137367654) | [Frame Sixty Labs, LLC](https://appshunter.io/developer/1729690352) |

## What reviewers say

### Calculation Time

[App page](https://appshunter.io/ios/app/calculation-time/id1479201130)

**In-app purchases:** none


### Prism

[App page](https://appshunter.io/ios/app/prism-calculator-and-converter/id6789737281)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prism Pro | $3.99 | one-time |


## Frequently asked questions

### Is Calculation Time free?

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

### Is Prism free?

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

### Do Calculation Time or Prism have ads?

Calculation Time shows ads; Prism does not.

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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.*