Probability vs Biostats Buddy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Probability
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.
- Compute probabilities
- Determine percentiles
- Plot probability density function
- Plot probability mass function
- Supports 10+ continuous distributions
- Supports 5+ discrete distributions
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Replace your statistical tables with an interactive, graphical app! Compute probabilities & percentiles, and plot the probability density/mass function for the normal (Gaussian), t, chi-square, F, exponential, gamma, beta, log-normal, and Uniform, binomial, geometric (2 versions), hypergeometric, Poisson, and negative binomial (2 versions) distributions. Now supports Español.
Biostats Buddy
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.
- 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
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Use Biostats Buddy to help in the calculation of common procedures used in biostatistics. Formulas and variable descriptions are included to assist with the process of calculations and to aid in retention of material. Biostats Buddy can be used to calculate: Z-scores One sample z tests One sample t tests Two related sample t tests User-friendly design makes it easy to enter calculation components and find results!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Probability | Biostats Buddy |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.9 (193 ratings) — better | 3.8 (4 ratings) |
| Positive reviews | 97.2% of reviews — better | 50.0% of reviews |
| Number of ratings | 193 — better | 4 |
| Update frequency | Every 3 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #196 — better | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 12 MB |
| Age rating | 17+ | 4+ |
| Developer | Matthew Bognar | California State University, Northridge |
Customer experience
Probability
Biostats Buddy
Bugs and requests
Probability
Requested features
7 requests- 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
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- Add options after graph rendering (area above, between, outside values)
- Consistent terms for df across distributions
Biostats Buddy
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Probability
No in-app purchases
Biostats Buddy
No in-app purchases
Questions
Is Probability free?
Is Biostats Buddy free?
Which has better reviews, Probability or Biostats Buddy?
Do Probability or Biostats Buddy have ads?
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