# Slatt vs On

The clearest difference is in-app purchases: On at none against Slatt's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Slatt sells 2 in-app purchases, starting at $19.99 per month. On asks for nothing beyond the download.

## The numbers

| Metric | Slatt | On |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/on-time-calculator/id6764490984/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | — | Free |
| Size | 41 MB | 33 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Voidback, Inc.](https://appshunter.io/developer/1891926153) | [Yuen Jing Liu](https://appshunter.io/developer/1895804293) |

## What reviewers say

### Slatt

[App page](https://appshunter.io/ios/app/slatt/id6761900934)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $19.99 | per month |
| Annual Pro | $190.99 | per year |


### On

[App page](https://appshunter.io/ios/app/on-time-calculator/id6764490984)

This app calculates the optimal alarm time by factoring in your morning routine, commute, and buffer time for unexpected delays. Simply input your preparation duration, travel time, and desired arrival, and it instantly provides the perfect wake-up call.

**Highlights:** Calculate alarm time, Input routine duration, Input commute time, Add buffer time, Intuitive interface, Copy time to clipboard

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Slatt free?

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

### Is On free?

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

### Do Slatt or On have ads?

Neither Slatt nor On 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.*