# Pearl Diver vs Comprehension Builder.

The clearest difference is review sentiment: Pearl Diver at 76% against Comprehension Builder.'s 0%. Pearl Diver also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 3). Comprehension Builder.'s advantage is iOS requirement (12.2 vs 17.6). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Comprehension Builder. sells 3 one-off in-app purchases. Pearl Diver asks for nothing beyond the download.

Pearl Diver holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 76% of Pearl Diver's written reviews are positive against 0% of Comprehension Builder.'s.

Pearl Diver ships an update every 20 months, Comprehension Builder. every 47 months. The most recent releases landed on November 1, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Pearl Diver | Comprehension Builder. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pearl-diver-number-line-math/id337567843/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/comprehension-builder/id1238808362/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | **76.2% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 20 months** | Every 47 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 50 MB |
| Requires iOS | 17.6 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [New Mexico State University Board of Regents](https://appshunter.io/developer/337567846) | [Janine Toole](https://appshunter.io/developer/839832427) |

## What reviewers say

### Pearl Diver

[App page](https://appshunter.io/ios/app/pearl-diver-number-line-math/id337567843)

Dive into the ocean to master the number line, including fractions and decimals, by collecting pearls. This educational game is designed by experts to align with Common Core standards for grades 3-8.

**Highlights:** Number line mastery, Fractions and decimals, Common Core alignment, Progress tracking, Educational game design

**Features:** macOS Compatibility

**In-app purchases:** none


### Comprehension Builder.

[App page](https://appshunter.io/ios/app/comprehension-builder/id1238808362)

This app helps users improve reading comprehension, working memory, and the ability to answer questions about text. It features incremental learning with texts that increase in length and difficulty as skills develop, along with a reward system for motivation. Designed for learners of all ages, including those with special needs or learning English.

**Highlights:** Passage comprehension practice, Working memory development, Answering multiple-choice questions, Incremental learning levels, Reward Center for motivation, 200+ fiction and non-fiction texts, Content designed by teachers

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Two Users | $1.99 | one-time |
| All Levels | $3.99 | one-time |
| 10 Users | $3.99 | one-time |


## Frequently asked questions

### Is Pearl Diver free?

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

### Is Comprehension Builder. free?

Comprehension Builder. is free to download, with in-app purchases available.

### Which has better reviews, Pearl Diver or Comprehension Builder.?

Pearl Diver is rated higher. Pearl Diver averages 5.0 out of 5 from 2 ratings, while Comprehension Builder. averages 2.0 from 2 ratings.

### Do Pearl Diver or Comprehension Builder. have ads?

Neither Pearl Diver nor Comprehension Builder. shows ads.

### Which is updated more often, Pearl Diver or Comprehension Builder.?

Pearl Diver ships an update every 20 months, and Comprehension Builder. every 47 months. Most recently, Pearl Diver was updated on November 1, 2026 and Comprehension Builder. on October 16, 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.*