Comparison

S, Z, & S Blends vs Feature Function Class

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

S, Z, & S Blends

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
Read full description

This game was designed by a speech therapist to improve your child’s S and S blend sound production while keeping them entertained with fun interactive graphics. Target sounds are presented in initial, medial, and final positions in 1-3 syllable words. This game not only addresses articulation but can also improve your child’s receptive and expressive language skills. S Blends covered are: Sp, Sm, Sn, Sw, St, Ts, Sk, Ks, Sl, Ls Features: Over 350 target words Full narration by a Speech Therapist Interactive graphics Vibrant, hand-drawn illustrations and animations Perfect for children ages 3-12

About

Feature Function Class

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
Read full description

Feature Function Class is a powerful visual teaching tool designed for educators, therapists, and parents working on receptive language and categorization skills. Built specifically for Feature-Function-Class (FFC) training, this app streamlines the process of presenting images and testing identification skills. WHAT IS FEATURE-FUNCTION-CLASS? Feature-Function-Class is a proven teaching methodology used in Applied Behavior Analysis (ABA) therapy and early childhood education. It helps learners identify and categorize objects by: - Features — What you SEE (color, shape, parts) - Functions — What it DOES or how you USE it - Classes — What CATEGORY it belongs to HOW IT WORKS Select any Feature, Function, or Class filter and the app instantly displays a set of images — with one image always matching your selected criteria. This creates natural teaching opportunities and quick identification trials. KEY FEATURES ◆ 300+ Pre-Tagged Images Start immediately with a library of high-quality, royalty-free images professionally tagged with features, functions, and classes. ◆ Smart Filtering Filter by Feature (spots, red, round), Function (cuts, you sit on it), or Class (animals, furniture, food). Combine filters to narrow results. ◆ Shuffle Mode Keep training fresh — Shuffle loads new images while always maintaining one that matches your filter. Cycle through your entire library without losing focus on the training target. ◆ Reorder Mode Test true recognition — Reorder keeps the same images but shuffles their positions. Perfect for confirming the learner recognizes the target, not just its location on screen. ◆ Adjustable Grid Size Scale difficulty from 2 to 8 images. Start simple and increase complexity as skills improve. ◆ Save & Load Sets Working with a client over multiple sessions? Save your image set once and reload it instantly. Maintain consistency across training sessions. ◆ Import Your Own Photos Add personal photos and tag them with custom features, functions, and classes. Include familiar objects, family members, or items specific to your learner's environment. ◆ Custom Tags Create your own feature, function, and class tags to extend the built-in library and personalize training. DESIGNED FOR - ABA Therapists & BCBAs - Speech-Language Pathologists - Special Education Teachers - Early Intervention Specialists - Parents supporting skill development at home Whether you're running discrete trials, building receptive vocabulary, or working on categorization skills, Feature Function Class gives you the tools to create effective, engaging training sessions.

Screenshots

S, Z, & S Blends4 screens
Feature Function Class4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 4 level
S, Z, & S Blends versus Feature Function Class: the parameters behind the verdict, then further details
ParameterS, Z, & S BlendsFeature Function Class
Price$2.99Free — better
Rating1.0 (2 ratings)5.0 (1 ratings) — better
Number of ratings2 — better1
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better18.6
Further details — not scored
Size71 MB101 MB
Age rating4+4+
DeveloperPreferred Mobile Applications, LLCJudeWorks

Customer experience

S, Z, & S Blends

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

Feature Function Class

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

S, Z, & S Blends

No in-app purchases

None

Feature Function Class

No in-app purchases

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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