# Decoding Chart vs WordBuilder Intervention

The clearest difference is rating: WordBuilder Intervention at 4.7 against Decoding Chart's 3.5. WordBuilder Intervention also leads on update cadence (every 11 months vs every 71 months) and ratings volume (6 vs 2). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

WordBuilder Intervention holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Decoding Chart ships an update every 71 months, WordBuilder Intervention every 11 months. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Decoding Chart | WordBuilder Intervention |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/decoding-chart-flip/id499927572/reviews) | **[4.7 (6 ratings)](https://appshunter.io/ios/app/wordbuilder-intervention/id1484290594/reviews)** |
| Number of ratings | 2 | **6** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 71 months | **Every 11 months** |
| Monetization | Free | Free |
| Size | 9 MB | 43 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bob Baratta-Lorton](https://appshunter.io/developer/499646138) | [Napa County Office of Education](https://appshunter.io/developer/1484290593) |

## What reviewers say

### Decoding Chart

[App page](https://appshunter.io/ios/app/decoding-chart-flip/id499927572)

This app is part of a reading and writing curriculum designed for beginning readers or those who have struggled with literacy. It helps children transition from recognizing sounds to understanding letter spellings, using color-coded charts to guide them.

**Highlights:** Sound-to-letter decoding, Color-coded spelling guidance, Frequency-based spelling order, Part of a comprehensive reading program, Supports beginning readers

**Features:** macOS Compatibility

**In-app purchases:** none


### WordBuilder Intervention

[App page](https://appshunter.io/ios/app/wordbuilder-intervention/id1484290594)

This free educational tool helps adolescent struggling readers learn to deconstruct, construct, and spell complex words. Designed for direct instruction in small groups or one-on-one settings, it offers a year's worth of practice with motivating elements.

**Highlights:** Deconstruct multisyllabic words, Build and spell words, Research-based instruction, Motivating coin rewards, Academic Word List integration, 540 words and sentences

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decoding Chart free?

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

### Is WordBuilder Intervention free?

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

### Which has better reviews, Decoding Chart or WordBuilder Intervention?

WordBuilder Intervention is rated higher. Decoding Chart averages 3.5 out of 5 from 2 ratings, while WordBuilder Intervention averages 4.7 from 6 ratings.

### Do Decoding Chart or WordBuilder Intervention have ads?

Neither Decoding Chart nor WordBuilder Intervention shows ads.

### Which is updated more often, Decoding Chart or WordBuilder Intervention?

Decoding Chart ships an update every 71 months, and WordBuilder Intervention every 11 months. Most recently, Decoding Chart was updated on October 11, 2026 and WordBuilder Intervention on October 3, 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.*