Comparison

Probability Distribution vs Z

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Calculate probabilities
  • Visualize distributions
  • Normal (Gaussian) distribution
  • Binomial distribution
  • Poisson distribution
  • Exponential distribution
Features
Read full description

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.

About

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.

Highlights
  • Comprehensive Z-score tables
  • Fast probability calculation
  • User-friendly interface
  • Educational tool for statistics
  • Reference for data analysis
Features
Read full description

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

Probability Distribution4 screens
Z4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard9 real differences · 1 level
Probability Distribution versus Z: the parameters behind the verdict, then further details
ParameterProbability DistributionZ
PriceFree — better$2.99
Rating4.5 (15 ratings)5.0 (1 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings15 — better1
Update frequencyEvery 2 weeks — betterEvery 6 weeks
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationPaidAd-supported — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.012.0 — better
Further details — not scored
Size7 MB32 MB
Age rating4+4+
DeveloperMadiyar AitbayevJanoGroup LLC

Customer experience

Probability Distribution

All ratings15 ratings
Positive86.7%
Neutral0.0%
Negative13.3%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Z

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Probability Distribution

One-time1
  • Unlock All Distributions$2.99
None

Z

No in-app purchases

Questions

Is Probability Distribution free?
Probability Distribution is free to download, with in-app purchases available.
Is Z free?
Z costs $2.99, with no in-app purchases.
Which has better reviews, Probability Distribution or Z?
Z is rated higher. Probability Distribution averages 4.5 out of 5 from 15 ratings, while Z averages 5.0 from 1 ratings.
Do Probability Distribution or Z have ads?
Z shows ads; Probability Distribution does not.
Which is updated more often, Probability Distribution or Z?
Probability Distribution ships an update every 2 weeks, and Z every 6 weeks. Most recently, Probability Distribution was updated on September 9, 2026 and Z on September 22, 2026.

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