# Binomial Probability P(X=k) vs Electrolyte Equilibria

The clearest difference is in-app purchases: Electrolyte Equilibria at none against Binomial Probability P(X=k)'s 8. Binomial Probability P(X=k)'s advantage is update cadence (every 3 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Binomial Probability P(X=k) sells 8 one-off in-app purchases. Electrolyte Equilibria asks for nothing beyond the download.

Binomial Probability P(X=k) ships an update every 3 weeks, Electrolyte Equilibria every 3 months. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Binomial Probability P(X=k) | Electrolyte Equilibria |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 180 MB | 108 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Oleksandr Rubtsov](https://appshunter.io/developer/1823549572) |

## What reviewers say

### Binomial Probability P(X=k)

[App page](https://appshunter.io/ios/app/binomial-probability-pxk/id6472449007)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Lifetime Access | $1.99 | one-time |
| Remove Ads | $1.99 | one-time |


### Electrolyte Equilibria

[App page](https://appshunter.io/ios/app/electrolyte-equilibria/id6754345279)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Binomial Probability P(X=k) free?

Binomial Probability P(X=k) is free to download, with in-app purchases available.

### Is Electrolyte Equilibria free?

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

### Do Binomial Probability P(X=k) or Electrolyte Equilibria have ads?

Neither Binomial Probability P(X=k) nor Electrolyte Equilibria shows ads.

### Which is updated more often, Binomial Probability P(X=k) or Electrolyte Equilibria?

Binomial Probability P(X=k) ships an update every 3 weeks, and Electrolyte Equilibria every 3 months. Most recently, Binomial Probability P(X=k) was updated on October 2, 2026 and Electrolyte Equilibria on September 26, 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.*