# Articulation IV vs Keywords Understanding Lite

The clearest difference is price: Keywords Understanding Lite at Free against Articulation IV's $9.99. Articulation IV's advantage is update cadence (every 9 months vs every 68 months) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Keywords Understanding Lite is free to download; Articulation IV costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Articulation IV ships an update every 9 months, Keywords Understanding Lite every 68 months. The most recent releases landed on September 11, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | Articulation IV | Keywords Understanding Lite |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/keywords-understanding-lite/id1537440607/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 68 months |
| Monetization | — | Free |
| Size | 275 MB | 60 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Learning Fundamentals, Inc.](https://appshunter.io/developer/454061076) | [Aptus Speech and Language Therapy Limited](https://appshunter.io/developer/1482673468) |

## What reviewers say

### Articulation IV

[App page](https://appshunter.io/ios/app/articulation-iv/id515128379)

**Features:** macOS Compatibility

**In-app purchases:** none


### Keywords Understanding Lite

[App page](https://appshunter.io/ios/app/keywords-understanding-lite/id1537440607)

This app offers a sample of speech and language therapy exercises focused on sentence comprehension. It helps users practice following directions, understanding basic concepts, and improving auditory and reading comprehension skills through interactive activities.

**Highlights:** Listening comprehension exercises, Reading comprehension exercises, Following directions (one/two-step, temporal, sequential), Basic concepts (size, color), Vocabulary understanding, Sample of full app features

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Articulation IV free?

Articulation IV costs $9.99, with no in-app purchases.

### Is Keywords Understanding Lite free?

Keywords Understanding Lite is free to download, with no in-app purchases.

### Do Articulation IV or Keywords Understanding Lite have ads?

Neither Articulation IV nor Keywords Understanding Lite shows ads.

### Which is updated more often, Articulation IV or Keywords Understanding Lite?

Articulation IV ships an update every 9 months, and Keywords Understanding Lite every 68 months. Most recently, Articulation IV was updated on September 11, 2026 and Keywords Understanding Lite on August 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.*