# Probability vs Trillion

The clearest difference is ads: Probability at none against Trillion's shown. Probability also leads on update cadence (every 10 days vs every 12 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Probability sells 1 one-off in-app purchase and Trillion sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Probability ships an update every 10 days, Trillion every 12 months. The most recent releases landed on September 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Probability | Trillion |
| --- | --- | --- |
| 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 | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 12 months |
| Monetization | Free with in-app purchases | — |
| Size | 166 MB | 29 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Man Hung Sun](https://appshunter.io/developer/1471605573) | [kota tada](https://appshunter.io/developer/1658942612) |

## 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 |


### Trillion

[App page](https://appshunter.io/ios/app/trillion-probability-simu/id6743378063)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free for 1 month | $4.99 | per month |
| Ad-free for 1 year | $49.99 | per year |


## Frequently asked questions

### Is Probability free?

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

### Is Trillion free?

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

### Do Probability or Trillion have ads?

Trillion shows ads; Probability does not.

### Which is updated more often, Probability or Trillion?

Probability ships an update every 10 days, and Trillion every 12 months. Most recently, Probability was updated on September 4, 2026 and Trillion on September 18, 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.*