# SPU i vs ReadDi E

The clearest difference is update cadence: SPU i at every 2 months against ReadDi E's every 8 months. SPU i also leads on iOS requirement (6.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

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

SPU i ships an update every 2 months, ReadDi E every 8 months. The most recent releases landed on November 10, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | SPU i | ReadDi E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Size | 36 MB | 8 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Sripatum University](https://appshunter.io/developer/491287641) | [BOOKDOSE COMPANY LIMITED](https://appshunter.io/developer/459445000) |

## What reviewers say

### SPU i

[App page](https://appshunter.io/ios/app/spu-i-ebook/id535039816)

**Features:** macOS Compatibility

**In-app purchases:** none


### ReadDi E

[App page](https://appshunter.io/ios/app/readdi-e-library/id1603809674)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SPU i free?

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

### Is ReadDi E free?

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

### Do SPU i or ReadDi E have ads?

Neither SPU i nor ReadDi E shows ads.

### Which is updated more often, SPU i or ReadDi E?

SPU i ships an update every 2 months, and ReadDi E every 8 months. Most recently, SPU i was updated on November 10, 2026 and ReadDi E on November 7, 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.*