Probability vs Probability Distribution
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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Compute probabilities, determine percentiles, and plot the probability density function for the normal (Gaussian), t, chi-square, F, exponential, gamma, beta, log-normal, Pareto, and Weibull distributions. Compute probabilities, approximate percentiles, and plot the probability mass function for the binomial, geometric, hypergeometric, Poisson, and negative binomial distributions.
Probability Distribution
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.
- Calculate probabilities
- Visualize distributions
- Normal (Gaussian) distribution
- Binomial distribution
- Poisson distribution
- Exponential distribution
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Calculate probabilities and visualize probability distributions. Supported continuous probability distributions: - Normal (Gaussian) - t (Student's t) - Chi-Squared - F - Exponential - Gamma - Beta - Log-normal Supported discrete probability distributions: - Binomial - Poisson - Pascal - Geometric - Hypergeometric and more are coming.
Screenshots
Verdict
The clearest difference is review sentiment: Probability at 97% against Probability Distribution's 33%. Probability also leads on in-app purchases (none vs 1) and rating (4.9 vs 4.5). Probability Distribution's advantage is price (Free vs $1.99) and update cadence (every 2 weeks vs every 3 months). On ads and device support 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
Probability Distribution is free to download; Probability costs $1.99 up front. Probability Distribution sells 1 one-off in-app purchase. Probability asks for nothing beyond the download.
Probability holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Probability has 193 ratings behind it against 15, 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 33% of Probability Distribution's.
Probability ships an update every 3 months, Probability Distribution every 2 weeks. The most recent releases landed on September 23, 2026 and September 9, 2026 respectively.
| Parameter | Probability | Probability Distribution |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.9 (193 ratings) — better | 4.5 (15 ratings) |
| Positive reviews | 97.2% of reviews — better | 33.3% of reviews |
| Number of ratings | 193 — better | 15 |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 2 MB | 7 MB |
| Age rating | 17+ | 4+ |
| Developer | Matthew Bognar | Madiyar Aitbayev |
Customer experience
Probability
Probability Distribution
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
Probability Distribution
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Probability
No in-app purchases
Probability Distribution
- Unlock All Distributions$2.99
Questions
Is Probability free?
Is Probability Distribution free?
Which has better reviews, Probability or Probability Distribution?
Do Probability or Probability Distribution have ads?
Which is updated more often, Probability or Probability Distribution?
Other comparisons
