# Probability vs Relax Before Sleep

The clearest difference is in-app purchases: Relax Before Sleep at none against Probability's 1. Probability's advantage is update cadence (every 10 days vs every 10 months) and iOS requirement (14.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Probability sells 1 one-off in-app purchase. Relax Before Sleep asks for nothing beyond the download.

Probability ships an update every 10 days, Relax Before Sleep every 10 months. The most recent releases landed on September 4, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Probability | Relax Before Sleep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 10 months |
| Monetization | Free with in-app purchases | — |
| Size | 166 MB | 55 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Man Hung Sun](https://appshunter.io/developer/1471605573) | [Hangzhou Plastic Engine Technology Co., Ltd](https://appshunter.io/developer/1761472358) |

## What reviewers say

### Probability

[App page](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969)

Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.

**Highlights:** Probability assessment, Decision-making improvement, Problem-solving formulas, Personalized notes, Dice and coin toss simulations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $0.99 | one-time |


### Relax Before Sleep

[App page](https://appshunter.io/ios/app/relax-before-sleep/id6755080401)

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

**In-app purchases:** none


## Frequently asked questions

### Is Probability free?

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

### Is Relax Before Sleep free?

Relax Before Sleep is free to download, with no in-app purchases.

### Do Probability or Relax Before Sleep have ads?

Neither Probability nor Relax Before Sleep shows ads.

### Which is updated more often, Probability or Relax Before Sleep?

Probability ships an update every 10 days, and Relax Before Sleep every 10 months. Most recently, Probability was updated on September 4, 2026 and Relax Before Sleep on September 6, 2026.

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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.*