# Probability Calculator Plus vs Spanish Reader

The clearest difference is price: Spanish Reader at Free against Probability Calculator Plus's $2.99. Spanish Reader also leads on update cadence (every 4 months vs every 23 months) and iOS requirement (15.6 vs 17.6). Probability Calculator Plus's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

Spanish Reader is free to download; Probability Calculator Plus costs $2.99 up front. Spanish Reader sells 2 in-app purchases, starting at $1.99 per month. Probability Calculator Plus asks for nothing beyond the download.

Probability Calculator Plus ships an update every 23 months, Spanish Reader every 4 months. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Probability Calculator Plus | Spanish Reader |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/probability-calculator-plus/id1625628315/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 4 months** |
| Monetization | Paid | — |
| Size | 1 MB | 100 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [粤珠 袁](https://appshunter.io/developer/1875136461) |

## What reviewers say

### Probability Calculator Plus

[App page](https://appshunter.io/ios/app/probability-calculator-plus/id1625628315)

Master probability and statistics with instant, step-by-step solutions for various calculations and distributions. Includes a random experiment simulator and a comprehensive reference guide.

**Highlights:** Basic and conditional probability calculations, Venn diagram calculator with visual representation, Statistical distributions (Binomial, Normal, Poisson), Random experiment simulator (dice, coins, cards), Step-by-step solutions for all calculations, Calculation history and reference guide

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

**In-app purchases:** none


### Spanish Reader

[App page](https://appshunter.io/ios/app/spanish-reader/id6766080273)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spanish Reader | $1.99 | per month |
| Spanish Reader | $12.99 | per year |


## Frequently asked questions

### Is Probability Calculator Plus free?

Probability Calculator Plus costs $2.99, with no in-app purchases.

### Is Spanish Reader free?

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

### Do Probability Calculator Plus or Spanish Reader have ads?

Neither Probability Calculator Plus nor Spanish Reader shows ads.

### Which is updated more often, Probability Calculator Plus or Spanish Reader?

Probability Calculator Plus ships an update every 23 months, and Spanish Reader every 4 months. Most recently, Probability Calculator Plus was updated on September 21, 2026 and Spanish Reader on September 11, 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.*