# Simplex Spelling HD vs Number Blast

The clearest difference is review sentiment: Simplex Spelling HD at 90% against Number Blast's 0%. Simplex Spelling HD also leads on in-app purchases (none vs 1) and update cadence (every 3 months vs every 39 months). Number Blast's advantage is price (Free vs $4.99) and iOS requirement (13.0 vs 15.0). On ads and device support there is nothing between them.

Number Blast is free to download; Simplex Spelling HD costs $4.99 up front. Number Blast sells 1 one-off in-app purchase. Simplex Spelling HD asks for nothing beyond the download.

Simplex Spelling HD ships an update every 3 months, Number Blast every 39 months. The most recent releases landed on October 22, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Simplex Spelling HD | Number Blast |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.2 (5 ratings)](https://appshunter.io/ios/app/simplex-spelling-hd/id456744012/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **90.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 39 months |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#181** | — |
| Size | 134 MB | 30 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pyxwise Software Inc.](https://appshunter.io/developer/456744015) | [BrainTrain Inc.](https://appshunter.io/developer/584469134) |

## What reviewers say

### Simplex Spelling HD

[App page](https://appshunter.io/ios/app/simplex-spelling-hd/id456744012)

**Currently charting:** #181 Top Paid · Education (US App Store)

This app enhances English spelling and reading skills using a unique "reverse phonics" approach and contextually relevant spelling rules. It acts as a personal spelling coach, teaching foundational Dolch sight words through interactive word building and immediate feedback.

**Highlights:** Teaches Dolch Sight words, Reverse phonics approach, Contextual spelling rules, Interactive word building, Phonics hint feature, Letter-by-letter feedback, Multiple user accounts

**Features:** macOS Compatibility

**In-app purchases:** none


### Number Blast

[App page](https://appshunter.io/ios/app/number-blast-memory-trainer/id1208566898)

This educational game helps children aged 5-7 develop memory, attention, and number recognition skills through engaging number sequence challenges. It features adjustable difficulty, a two-player mode, and progress tracking to foster cognitive abilities for school and life.

**Highlights:** Memory and attention training, Number sequence exercises, Adjustable difficulty levels, Two-player mode, Progress tracking and scoring, Kid-safe, no ads or tracking

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


## Frequently asked questions

### Is Simplex Spelling HD free?

Simplex Spelling HD costs $4.99, with no in-app purchases.

### Is Number Blast free?

Number Blast is free to download, with in-app purchases available.

### Do Simplex Spelling HD or Number Blast have ads?

Neither Simplex Spelling HD nor Number Blast shows ads.

### Which is updated more often, Simplex Spelling HD or Number Blast?

Simplex Spelling HD ships an update every 3 months, and Number Blast every 39 months. Most recently, Simplex Spelling HD was updated on October 22, 2026 and Number Blast on October 8, 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.*