# Probability vs Biostats Buddy

The clearest difference is review sentiment: Probability at 97% against Biostats Buddy's 50%. Probability also leads on rating (4.9 vs 3.8) and ratings volume (193 vs 4). Biostats Buddy's advantage is price (Free vs $1.99) and device support (3 vs 1). On ads, in-app purchases and monetization model there is nothing between them.

Biostats Buddy is free to download; Probability costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Probability holds the better App Store score, 4.9 against 3.8. That said, the two scores are not equally well evidenced: Probability has 193 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 97% of Probability's written reviews are positive against 50% of Biostats Buddy's.

## The numbers

| Metric | Probability | Biostats Buddy |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.9 (193 ratings)](https://appshunter.io/ios/app/probability-distributions/id889106396/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/biostats-buddy/id1110450142/reviews) |
| Number of ratings | **193** | 4 |
| Positive reviews | **97.2% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | Free |
| Best chart rank | **#196** | — |
| Size | 7 MB | 12 MB |
| Requires iOS | 26.0 | **8.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Matthew Bognar](https://appshunter.io/developer/889106399) | [California State University, Northridge](https://appshunter.io/developer/677332864) |

## What reviewers say

### Probability

[App page](https://appshunter.io/ios/app/probability-distributions/id889106396)

**Currently charting:** #196 Top Paid · Education (US App Store)

Calculate probabilities, find percentiles, and visualize probability density or mass functions for a wide range of continuous and discrete statistical distributions. Explore common distributions like normal, binomial, Poisson, and many more.

**Highlights:** Compute probabilities, Determine percentiles, Plot probability density function, Plot probability mass function, Supports 10+ continuous distributions, Supports 5+ discrete distributions

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use interface
- 📊 Great for probability distributions
- 💡 Useful for checking work and homework
- 💰 Free advanced functions
- 📈 Visualizes data and distributions

**What reviewers complain about**

- 🚫 Not allowed on some exams
- 🤔 Some users want more features

**Requested features**

- Exam mode similar to Geogebra
- Poisson distribution
- Allow setting plot boundaries (e.g., for Beta distribution)
- Make formulae available in offline mode
- Clearly introduce parameters


### Biostats Buddy

[App page](https://appshunter.io/ios/app/biostats-buddy/id1110450142)

This app assists with common biostatistics calculations, offering formulas and variable descriptions to aid understanding and retention. It simplifies the process of entering data and finding results for various statistical procedures.

**Highlights:** Biostatistics procedure calculations, Includes formulas, Variable descriptions for retention, User-friendly data entry, Z-scores, One sample z tests, One sample t tests, Two related sample t tests

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Probability free?

Probability costs $1.99, with no in-app purchases.

### Is Biostats Buddy free?

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

### Which has better reviews, Probability or Biostats Buddy?

Probability is rated higher. Probability averages 4.9 out of 5 from 193 ratings, while Biostats Buddy averages 3.8 from 4 ratings.

### Do Probability or Biostats Buddy have ads?

Neither Probability nor Biostats Buddy 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.*