# Mermaid Maths vs ReadBuddy.ai

The clearest difference is in-app purchases: Mermaid Maths at none against ReadBuddy.ai's 4. Mermaid Maths also leads on iOS requirement (15.6 vs 17.0). ReadBuddy.ai's advantage is update cadence (monthly vs every 58 months) and ratings volume (9 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. ReadBuddy.ai sells 4 in-app purchases, starting at $4.99 per month. Mermaid Maths asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Mermaid Maths against 5.0 for ReadBuddy.ai. That said, the two scores are not equally well evidenced: ReadBuddy.ai has 9 ratings behind it against 1, so its average is the more settled of the two.

Mermaid Maths ships an update every 58 months, ReadBuddy.ai monthly. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Mermaid Maths | ReadBuddy.ai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/mermaid-maths/id1567468963/reviews) | [5.0 (9 ratings)](https://appshunter.io/ios/app/readbuddyai/id6747660575/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 58 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 39 MB | 78 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [L&L Programming LLC](https://appshunter.io/developer/1289929597) | [Wei Si](https://appshunter.io/developer/1822226477) |

## What reviewers say

### Mermaid Maths

[App page](https://appshunter.io/ios/app/mermaid-maths/id1567468963)

This educational game helps children practice addition skills in a fun, underwater environment. Players earn treasure by solving math problems, which can then be used to customize their underwater world with new friends and backgrounds.

**Highlights:** Addition practice, Earn treasure rewards, Customize underwater scenes, Unlock new friends, Multiple backgrounds, Interactive gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


### ReadBuddy.ai

[App page](https://appshunter.io/ios/app/readbuddyai/id6747660575)

This AI-powered companion helps children understand any book they read by asking age-appropriate questions. It fosters comprehension, confidence, and critical thinking, allowing parents to track progress. Works with any physical or digital book.

**Highlights:** AI-powered reading comprehension, Works with any book, Age-appropriate questions, Parental progress tracking, Builds confidence and curiosity, No personal data collected

**Features:** Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadBuddy Basic Monthly | $4.99 | per month |
| ReadBuddy Family Monthly | $8.99 | per month |
| ReadBuddy Basic Yearly | $49.99 | per year |
| ReadBuddy Family Yearly | $89.99 | per year |


## Frequently asked questions

### Is Mermaid Maths free?

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

### Is ReadBuddy.ai free?

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

### Which has better reviews, Mermaid Maths or ReadBuddy.ai?

Mermaid Maths and ReadBuddy.ai are both rated 5.0 out of 5 on the App Store, from 1 and 9 ratings respectively.

### Do Mermaid Maths or ReadBuddy.ai have ads?

Neither Mermaid Maths nor ReadBuddy.ai shows ads.

### Which is updated more often, Mermaid Maths or ReadBuddy.ai?

Mermaid Maths ships an update every 58 months, and ReadBuddy.ai monthly. Most recently, Mermaid Maths was updated on October 13, 2026 and ReadBuddy.ai on October 24, 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.*