Probability Distribution vs Z
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Z
This app provides a quick and easy way for students and professionals to look up Z-scores and calculate corresponding probabilities. It features comprehensive Z-score tables and a user-friendly interface for efficient statistical analysis.
- Comprehensive Z-score tables
- Fast probability calculation
- User-friendly interface
- Educational tool for statistics
- Reference for data analysis
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Z-Table is a simple and powerful tool designed to help students, statisticians, and professionals look up Z-scores and corresponding probabilities with ease. Whether you're studying for an exam or working on data analysis, this app provides an efficient way to calculate and reference Z-scores. Key Features: Comprehensive Z-Score Tables: Access both positive and negative Z-tables to quickly look up critical Z-scores. Fast Probability Calculation: Find left-tail and right-tail probabilities with ease. User-Friendly Interface: The clean and minimal design ensures you can get the values you need without distractions. Educational Tool: Ideal for statistics students or professionals who frequently work with normal distributions. Why Choose Z-Table? Z-Table is optimized for speed and ease of use. Whether you are working on statistical analysis, preparing for exams, or just need a quick reference, Z-Table is the perfect companion. No ads, no distractions—just reliable and accurate statistical data at your fingertips. Who is this app for? Statistics students and teachers Data analysts and researchers Professionals in need of quick statistical references Download Z-Table today and simplify your statistical analysis process!
Screenshots
Verdict
The clearest difference is review sentiment: Z at 100% against Probability Distribution's 33%. Z also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 1). Probability Distribution's advantage is price (Free vs $2.99) and ads (none vs shown). On 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; Z costs $2.99 up front. Probability Distribution sells 1 one-off in-app purchase. Z asks for nothing beyond the download.
Z holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Probability Distribution has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 33% of Probability Distribution's written reviews are positive against 100% of Z's.
Probability Distribution ships an update every 2 weeks, Z every 6 weeks. The most recent releases landed on September 9, 2026 and September 22, 2026 respectively.
| Parameter | Probability Distribution | Z |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.5 (15 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 1 |
| Update frequency | Every 2 weeks — better | Every 6 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Madiyar Aitbayev | JanoGroup LLC |
Customer experience
Probability Distribution
Z
In-app purchases
Probability Distribution
- Unlock All Distributions$2.99
Z
No in-app purchases
Questions
Is Probability Distribution free?
Is Z free?
Which has better reviews, Probability Distribution or Z?
Do Probability Distribution or Z have ads?
Which is updated more often, Probability Distribution or Z?
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