# S, Z, & S Blends vs Feature Function Class

The clearest difference is price: Feature Function Class at Free against S, Z, & S Blends's $2.99. Feature Function Class also leads on rating (5.0 vs 1.0) and update cadence (every 2 months vs every 4 months). S, Z, & S Blends's advantage is iOS requirement (11.0 vs 18.6). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Feature Function Class is free to download; S, Z, & S Blends costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Feature Function Class holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

S, Z, & S Blends ships an update every 4 months, Feature Function Class every 2 months. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | S, Z, & S Blends | Feature Function Class |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/s-z-and-s-blends/id931589236/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/feature-function-class/id6755350562/reviews)** |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 71 MB | 101 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Preferred Mobile Applications, LLC](https://appshunter.io/developer/779885959) | [JudeWorks](https://appshunter.io/developer/1749456254) |

## What reviewers say

### S, Z, & S Blends

[App page](https://appshunter.io/ios/app/s-z-and-s-blends/id931589236)

This interactive game, designed by a speech therapist, helps children aged 3-12 improve their 'S' and 'S' blend sound production. It features over 350 target words with vibrant illustrations and full narration to enhance articulation and language skills.

**Highlights:** Improves 'S' and 'S' blend sound production, Over 350 target words, Full narration by a Speech Therapist, Interactive graphics and animations, Addresses articulation and language skills, Suitable for ages 3-12

**In-app purchases:** none


### Feature Function Class

[App page](https://appshunter.io/ios/app/feature-function-class/id6755350562)

This visual teaching tool aids educators, therapists, and parents in developing receptive language and categorization skills. It uses a proven methodology to present images and test identification based on features, functions, and classes. The app offers a large image library, smart filtering, and customization options for personalized training.

**Highlights:** 300+ pre-tagged images, Smart filtering by feature, function, or class, Shuffle and Reorder modes for varied practice, Adjustable grid size for difficulty scaling, Save and load custom image sets, Import and tag personal photos, Create custom tags

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

**In-app purchases:** none


## Frequently asked questions

### Is S, Z, & S Blends free?

S, Z, & S Blends costs $2.99, with no in-app purchases.

### Is Feature Function Class free?

Feature Function Class is free to download, with no in-app purchases.

### Which has better reviews, S, Z, & S Blends or Feature Function Class?

Feature Function Class is rated higher. S, Z, & S Blends averages 1.0 out of 5 from 2 ratings, while Feature Function Class averages 5.0 from 1 ratings.

### Do S, Z, & S Blends or Feature Function Class have ads?

Neither S, Z, & S Blends nor Feature Function Class shows ads.

### Which is updated more often, S, Z, & S Blends or Feature Function Class?

S, Z, & S Blends ships an update every 4 months, and Feature Function Class every 2 months. Most recently, S, Z, & S Blends was updated on October 2, 2026 and Feature Function Class on September 30, 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.*