# IntroStat vs Probability Distribution

The clearest difference is review sentiment: IntroStat at 92% against Probability Distribution's 33%. IntroStat also leads on rating (4.9 vs 4.5) and monetization model (free with in-app purchases vs paid). Probability Distribution's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. IntroStat sells 1 one-off in-app purchase and Probability Distribution sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

IntroStat holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 24 and 15 respectively. Written reviews point the same way: 92% of IntroStat's written reviews are positive against 33% of Probability Distribution's.

IntroStat ships an update every 3 months, Probability Distribution every 2 weeks. The most recent releases landed on September 18, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | IntroStat | Probability Distribution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (24 ratings)](https://appshunter.io/ios/app/introstat-statistics-solver/id1592602025/reviews)** | [4.5 (15 ratings)](https://appshunter.io/ios/app/probability-distribution/id6447695305/reviews) |
| Number of ratings | **24** | 15 |
| Positive reviews | **92.3% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 38 MB | 7 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zhiyi Zhang](https://appshunter.io/developer/1592602327) | [Madiyar Aitbayev](https://appshunter.io/developer/1229466587) |

## What reviewers say

### IntroStat

[App page](https://appshunter.io/ios/app/introstat-statistics-solver/id1592602025)

This app serves as a comprehensive statistics calculator and learning tool for introductory statistics courses. It offers a wide range of calculation features, data visualization, and an integrated textbook with formulas and examples.

**Highlights:** Summary statistics calculation, Data visualization (boxplots, histograms), Probability calculations, Hypothesis testing, Confidence intervals, Integrated statistics textbook

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IntroStat Premium Features | $4.99 | one-time |


### Probability Distribution

[App page](https://appshunter.io/ios/app/probability-distribution/id6447695305)

This app allows users to calculate probabilities and visualize various continuous and discrete probability distributions. It supports a wide range of common distributions and plans to add more in the future.

**Highlights:** Calculate probabilities, Visualize distributions, Normal (Gaussian) distribution, Binomial distribution, Poisson distribution, Exponential distribution

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Distributions | $2.99 | one-time |


## Frequently asked questions

### Is IntroStat free?

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

### Is Probability Distribution free?

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

### Which has better reviews, IntroStat or Probability Distribution?

IntroStat is rated higher. IntroStat averages 4.9 out of 5 from 24 ratings, while Probability Distribution averages 4.5 from 15 ratings.

### Do IntroStat or Probability Distribution have ads?

IntroStat shows ads; Probability Distribution does not.

### Which is updated more often, IntroStat or Probability Distribution?

IntroStat ships an update every 3 months, and Probability Distribution every 2 weeks. Most recently, IntroStat was updated on September 18, 2026 and Probability Distribution on September 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*