Probability vs IntroStat
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.
IntroStat
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.
- Summary statistics calculation
- Data visualization (boxplots, histograms)
- Probability calculations
- Hypothesis testing
- Confidence intervals
- Integrated statistics textbook
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IntroStat is a probability and statistics calculator. It is the perfect learning tool for an introductory statistics course. Use it to perform any of your statistics calculation needs. IntroStat also includes a statistics textbook complete with formulas, exercise problems, examples, and more. FREE IN THE CALCULATOR: • Enter & Save Datasets • Generate Summary Statistics • Calculate z-Scores • Draw Boxplots & Histograms • Visualize Key Concepts like The Empirical Formula • Plot Discrete and Continuous Random Variables • Perform Probability Calculations • Conduct Hypothesis Testing • Compute Confidence Intervals • Lookup Critical Values of Distributions • Perform Simple Regression Analysis • ANOVA, Chi-Square, & F-Tests • Introductory Statistics Textbook Upgrade as a Premium User to unlock: • Dark Mode • 12 Color Themes • Zoom • Custom Decimal Precision • Comma Display • No Ads Have any questions? Please reach out to us via email at IntroStatApp@gmail.com. End User Licensing Agreement: https://www.introstatapp.com/user-agreement Privacy Policy: https://www.introstatapp.com/privacy-policy
Screenshots
Verdict
The clearest difference is price: IntroStat at Free against Probability's $1.99. IntroStat also leads on iOS requirement (11.0 vs 14.0). Probability's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, review sentiment, update cadence 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
IntroStat is free to download; Probability costs $1.99 up front. IntroStat sells 1 one-off in-app purchase. Probability asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Probability against 4.9 for IntroStat. That said, the two scores are not equally well evidenced: Probability has 193 ratings behind it against 24, so its average is the more settled of the two. Written reviews are what separate them: 97% of Probability's written reviews are positive against 92% of IntroStat's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.
| Parameter | Probability | IntroStat |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.9 (193 ratings) | 4.9 (24 ratings) — better |
| Positive reviews | 97.2% of reviews — better | 92.3% of reviews |
| Number of ratings | 193 — better | 24 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #151 — better | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 38 MB |
| Age rating | 17+ | 4+ |
| Developer | Matthew Bognar | Zhiyi Zhang |
Customer experience
Probability
IntroStat
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
IntroStat
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Probability
No in-app purchases
IntroStat
- IntroStat Premium Features$4.99
Questions
Is Probability free?
Is IntroStat free?
Which has better reviews, Probability or IntroStat?
Do Probability or IntroStat have ads?
Which is updated more often, Probability or IntroStat?
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