# Feature Function Class vs Discrete Trial

The clearest difference is price: Feature Function Class at Free against Discrete Trial's $14.99. Discrete Trial's advantage is update cadence (every 5 days vs every 2 months) and iOS requirement (16.0 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

Feature Function Class is free to download; Discrete Trial costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Feature Function Class ships an update every 2 months, Discrete Trial every 5 days. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Feature Function Class | Discrete Trial |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/feature-function-class/id6755350562/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 101 MB | 245 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JudeWorks](https://appshunter.io/developer/1749456254) | [Samantha Cooper](https://appshunter.io/developer/1880437500) |

## What reviewers say

### 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


### Discrete Trial

[App page](https://appshunter.io/ios/app/discrete-trial/id6759739343)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Feature Function Class free?

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

### Is Discrete Trial free?

Discrete Trial costs $14.99, with no in-app purchases.

### Do Feature Function Class or Discrete Trial have ads?

Neither Feature Function Class nor Discrete Trial shows ads.

### Which is updated more often, Feature Function Class or Discrete Trial?

Feature Function Class ships an update every 2 months, and Discrete Trial every 5 days. Most recently, Feature Function Class was updated on September 30, 2026 and Discrete Trial on October 2, 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.*