# Markov Algorithm vs Probability

The clearest difference is in-app purchases: Probability at none against Markov Algorithm's 3. Probability also leads on iOS requirement (9.0 vs 15.0). Markov Algorithm's advantage is update cadence (every 5 weeks vs every 18 months). On price, ads and device support there is nothing between them.

Both are free to download. Markov Algorithm sells 3 in-app purchases, starting at $3.99 per month. Probability asks for nothing beyond the download.

Markov Algorithm ships an update every 5 weeks, Probability every 18 months. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Markov Algorithm | Probability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/markov-algorithm/id1427691412/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 18 months |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 1 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Konstantin Mishukov](https://appshunter.io/developer/1164017853) | [domesticusdevelop](https://appshunter.io/developer/373834594) |

## What reviewers say

### Markov Algorithm

[App page](https://appshunter.io/ios/app/markov-algorithm/id1427691412)

This tool emulates a Markov Machine, a string rewriting system used in computer science. It helps students test and debug algorithms with grammar-like rules and a step-by-step execution log.

**Highlights:** Markov Machine emulator, String rewriting system, Grammar-like rule application, Step-by-step debugging, Execution log

**Features:** Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium: Monthly | $3.99 | per month |
| Premium: Annual | $14.99 | per year |
| Lifetime access | $19.99 | one-time |


### Probability

[App page](https://appshunter.io/ios/app/probability-dd/id1451460705)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Markov Algorithm free?

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

### Is Probability free?

Probability is free to download, with no in-app purchases.

### Do Markov Algorithm or Probability have ads?

Neither Markov Algorithm nor Probability shows ads.

### Which is updated more often, Markov Algorithm or Probability?

Markov Algorithm ships an update every 5 weeks, and Probability every 18 months. Most recently, Markov Algorithm was updated on October 3, 2026 and Probability on October 6, 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.*