# Fitness Calc Pro vs Interval Timer (Simple)

The clearest difference is in-app purchases: Fitness Calc Pro at none against Interval Timer (Simple)'s 1. Interval Timer (Simple)'s advantage is iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Interval Timer (Simple) sells 1 one-off in-app purchase. Fitness Calc Pro asks for nothing beyond the download.

## The numbers

| Metric | Fitness Calc Pro | Interval Timer (Simple) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 4 MB | 28 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Jamie Maxwell](https://appshunter.io/developer/1810767645) | [Domett Xing](https://appshunter.io/developer/1876098022) |

## What reviewers say

### Fitness Calc Pro

[App page](https://appshunter.io/ios/app/fitness-calc-pro/id6747368783)

**Features:** macOS Compatibility

**In-app purchases:** none


### Interval Timer (Simple)

[App page](https://appshunter.io/ios/app/interval-timer-simple/id6758968811)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $6.99 | one-time |


## Frequently asked questions

### Is Fitness Calc Pro free?

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

### Is Interval Timer (Simple) free?

Interval Timer (Simple) is free to download, with in-app purchases available.

### Do Fitness Calc Pro or Interval Timer (Simple) have ads?

Neither Fitness Calc Pro nor Interval Timer (Simple) 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.*