# Three vs SortCal

The clearest difference is rating: SortCal at 5.0 against Three's 4.6. Three's advantage is iOS requirement (15.6 vs 17.5). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SortCal holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Three ships an update every 6 months, SortCal every 5 months. The most recent releases landed on October 23, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Three | SortCal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/three-sound-flipbook/id499735475/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sortcal/id1563242104/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 67 MB | 3 MB |
| Requires iOS | **15.6** | 17.5 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Bob Baratta-Lorton](https://appshunter.io/developer/499646138) | [Jaekeun Sung](https://appshunter.io/developer/1563197906) |

## What reviewers say

### Three

[App page](https://appshunter.io/ios/app/three-sound-flipbook/id499735475)

This educational app helps beginning readers learn letter sounds within the context of words. It models sound blending and ensures children have the necessary vocabulary to progress in reading and writing.

**Highlights:** Learn letter sounds in words, Model sound blending, Build vocabulary, Part of a comprehensive reading program, Ad-free learning experience

**Features:** macOS Compatibility

**In-app purchases:** none


### SortCal

[App page](https://appshunter.io/ios/app/sortcal/id1563242104)

This app combines calculator functionality with note-taking and flashcard study tools. It allows users to review past calculations and easily delete digits. It's designed for everyday math tasks and educational support.

**Highlights:** Previous calculations history, Digit deletion button, Note taking functionality, Flashcard study mode

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Three free?

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

### Is SortCal free?

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

### Which has better reviews, Three or SortCal?

SortCal is rated higher. Three averages 4.6 out of 5 from 5 ratings, while SortCal averages 5.0 from 2 ratings.

### Do Three or SortCal have ads?

Neither Three nor SortCal shows ads.

### Which is updated more often, Three or SortCal?

Three ships an update every 6 months, and SortCal every 5 months. Most recently, Three was updated on October 23, 2026 and SortCal on October 12, 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.*