# Binomial Probability P(X=k) vs Photo Diary

The clearest difference is ads: Binomial Probability P(X=k) at none against Photo Diary's shown. Binomial Probability P(X=k) also leads on device support (3 vs 1). On price, update cadence, in-app purchases 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 and Photo Diary sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Binomial Probability P(X=k) ships an update every 3 weeks, Photo Diary every 6 weeks. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Binomial Probability P(X=k) | Photo Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Size | 180 MB | 23 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## 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 |


### Photo Diary

[App page](https://appshunter.io/ios/app/photo-diary-year-journal/id6759998660)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly Plan | $4.99 | per 7 days |
| Premium Yearly | $24.99 | per year |
| Lifetime | $39.99 | one-time |


## 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 Photo Diary free?

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

### Do Binomial Probability P(X=k) or Photo Diary have ads?

Photo Diary shows ads; Binomial Probability P(X=k) does not.

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

Binomial Probability P(X=k) ships an update every 3 weeks, and Photo Diary every 6 weeks. Most recently, Binomial Probability P(X=k) was updated on November 4, 2026 and Photo Diary on October 28, 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.*