# iSPEX vs Chapter

The clearest difference is in-app purchases: iSPEX at none against Chapter's 1. iSPEX also leads on iOS requirement (15.0 vs 17.0). Chapter's advantage is update cadence (every 3 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Chapter sells 1 one-off in-app purchase. iSPEX asks for nothing beyond the download.

iSPEX ships an update every 2 months, Chapter every 3 days. The most recent releases landed on August 16, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | iSPEX | Chapter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/ispex/id584360175/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 5 MB | 285 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DDQ](https://appshunter.io/developer/418328467) | [Chapter Technologies Ltd](https://appshunter.io/developer/1756532171) |

## What reviewers say

### iSPEX

[App page](https://appshunter.io/ios/app/ispex/id584360175)

This educational tool analyzes light entering a smartphone, breaking it down by spectrum and polarization. It requires a specific hardware add-on to function.

**Highlights:** Spectrum analysis, Polarization analysis, Hardware add-on integration, Educational tool

**In-app purchases:** none


### Chapter

[App page](https://appshunter.io/ios/app/chapter-careers-game/id6529547618)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chapter Plus | Free | one-time |


## Frequently asked questions

### Is iSPEX free?

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

### Is Chapter free?

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

### Do iSPEX or Chapter have ads?

Neither iSPEX nor Chapter shows ads.

### Which is updated more often, iSPEX or Chapter?

iSPEX ships an update every 2 months, and Chapter every 3 days. Most recently, iSPEX was updated on August 16, 2026 and Chapter on September 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.*