# Probability Distribution vs Caliper

The clearest difference is update cadence: Caliper at every 2 days against Probability Distribution's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Probability Distribution sells 1 one-off in-app purchase and Caliper sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Probability Distribution ships an update every 2 weeks, Caliper every 2 days. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Probability Distribution | Caliper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/probability-distribution/id6447695305/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Paid | — |
| Size | 7 MB | 36 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Madiyar Aitbayev](https://appshunter.io/developer/1229466587) | [Concept of Proof B.V.](https://appshunter.io/developer/1818652911) |

## What reviewers say

### Probability Distribution

[App page](https://appshunter.io/ios/app/probability-distribution/id6447695305)

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:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Distributions | $2.99 | one-time |


### Caliper

[App page](https://appshunter.io/ios/app/caliper-vernier-trainer/id6816234993)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caliper Full Access | $2.99 | one-time |


## Frequently asked questions

### Is Probability Distribution free?

Probability Distribution is free to download, with in-app purchases available.

### Is Caliper free?

Caliper is free to download, with in-app purchases available.

### Do Probability Distribution or Caliper have ads?

Neither Probability Distribution nor Caliper shows ads.

### Which is updated more often, Probability Distribution or Caliper?

Probability Distribution ships an update every 2 weeks, and Caliper every 2 days. Most recently, Probability Distribution was updated on October 12, 2026 and Caliper on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*