# Probability vs Guided Sleep Relaxation

The clearest difference is in-app purchases: Guided Sleep Relaxation at none against Probability's 1. Probability's advantage is update cadence (every 10 days vs every 5 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. Guided Sleep Relaxation asks for nothing beyond the download.

Probability ships an update every 10 days, Guided Sleep Relaxation every 5 months. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Probability | Guided Sleep Relaxation |
| --- | --- | --- |
| 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 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 166 MB | 58 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 Kasoo Labs 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 |


### Guided Sleep Relaxation

[App page](https://appshunter.io/ios/app/guided-sleep-relaxation/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 Guided Sleep Relaxation free?

Guided Sleep Relaxation is free to download, with no in-app purchases.

### Do Probability or Guided Sleep Relaxation have ads?

Neither Probability nor Guided Sleep Relaxation shows ads.

### Which is updated more often, Probability or Guided Sleep Relaxation?

Probability ships an update every 10 days, and Guided Sleep Relaxation every 5 months. Most recently, Probability was updated on October 23, 2026 and Guided Sleep Relaxation on October 8, 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.*