# Grass Fire vs Sight words

The clearest difference is in-app purchases: Grass Fire at none against Sight words's 5. Grass Fire also leads on iOS requirement (12.0 vs 17.0). Sight words's advantage is update cadence (every 6 weeks vs every 15 months). On price, ads and device support there is nothing between them.

Both are free to download. Sight words sells 5 one-off in-app purchases. Grass Fire asks for nothing beyond the download.

Grass Fire ships an update every 15 months, Sight words every 6 weeks. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Grass Fire | Sight words |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (3 ratings)](https://appshunter.io/ios/app/grass-fire/id1440445499/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 66 MB | 70 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [arludo Pty Ltd](https://appshunter.io/developer/1023251086) | [Nuclear Cyborg Corp](https://appshunter.io/developer/910010732) |

## What reviewers say

### Grass Fire

[App page](https://appshunter.io/ios/app/grass-fire/id1440445499)

This educational app explores how the human brain interprets visual shapes. It's designed to help users understand the cognitive processes behind shape recognition and perception.

**Highlights:** Understanding shape interpretation, Cognitive process exploration, Visual perception testing, Educational content

**Features:** macOS Compatibility

**In-app purchases:** none


### Sight words

[App page](https://appshunter.io/ios/app/sight-words-first-words-match/id6499176211)

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $4.99 | one-time |
| Lifetime unlock | $6.99 | one-time |
| Lifetime Unlock | $9.99 | one-time |
| Lifetime Unlock | $12.99 | one-time |
| Lifetime Unlock | $19.99 | one-time |


## Frequently asked questions

### Is Grass Fire free?

Grass Fire is free to download, with no in-app purchases.

### Is Sight words free?

Sight words is free to download, with in-app purchases available.

### Do Grass Fire or Sight words have ads?

Neither Grass Fire nor Sight words shows ads.

### Which is updated more often, Grass Fire or Sight words?

Grass Fire ships an update every 15 months, and Sight words every 6 weeks. Most recently, Grass Fire was updated on October 21, 2026 and Sight words on October 25, 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.*