# ClearKey Calc vs Parallel

The clearest difference is in-app purchases: ClearKey Calc at none against Parallel's 1. ClearKey Calc also leads on iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Parallel sells 1 one-off in-app purchase. ClearKey Calc asks for nothing beyond the download.

## The numbers

| Metric | ClearKey Calc | Parallel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/parallel-multi-calculator/id6794806258/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 days |
| Monetization | — | Free |
| Size | 30 MB | 16 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [鹏飞 陈](https://appshunter.io/developer/1891216752) | [Evgenii Chizhov](https://appshunter.io/developer/6794806260) |

## What reviewers say

### ClearKey Calc

[App page](https://appshunter.io/ios/app/clearkey-calc/id6761746376)

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

**In-app purchases:** none


### Parallel

[App page](https://appshunter.io/ios/app/parallel-multi-calculator/id6794806258)

Perform multiple calculations simultaneously with a drag-and-drop interface. Features a scientific calculator, currency and crypto converter, and history saving with optional privacy locks. Customize with themes and fonts.

**Highlights:** Run 2, 3, or 4 calculations side-by-side, Drag and drop calculation arrangement, Scientific calculator mode, Currency and crypto converter, Save calculation history with notes, Face ID/passcode lock for privacy, Home screen widget and Quick Menu access

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Parallel Pro | $2.99 | one-time |


## Frequently asked questions

### Is ClearKey Calc free?

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

### Is Parallel free?

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

### Do ClearKey Calc or Parallel have ads?

Neither ClearKey Calc nor Parallel 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.*