# Sandbook vs Eris.

The clearest difference is update cadence: Eris. at every 2 weeks against Sandbook's every 7 months. Sandbook's advantage is rating (4.6 vs 4.3) and ratings volume (56 vs 6). 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.

Sandbook holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Sandbook has 56 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 82% of Sandbook's written reviews are positive against 80% of Eris.'s.

Sandbook ships an update every 7 months, Eris. every 2 weeks. The most recent releases landed on September 26, 2026 and July 4, 2026 respectively.

## The numbers

| Metric | Sandbook | Eris. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (56 ratings)](https://appshunter.io/ios/app/sandbook-natural-voice-reader/id6745732885/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/eris/id6747496749/reviews) |
| Number of ratings | **56** | 6 |
| Positive reviews | **81.8% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 433 MB | 34 MB |
| Requires iOS | 18.2 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SmashMelon LLC](https://appshunter.io/developer/1895995887) | [Ignacio Palacio](https://appshunter.io/developer/1773333920) |

## What reviewers say

### Sandbook

[App page](https://appshunter.io/ios/app/sandbook-natural-voice-reader/id6745732885)

This app converts text into natural-sounding speech using an on-device model. Read ePub, PDF, and TXT files, type or paste text, or even read webpages aloud. Export audio files for offline listening with complete privacy.

**Highlights:** On-device text-to-speech, Reads ePub, PDF, TXT files, Type or paste text, Read webpages aloud, Export audio files, Privacy protection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Eris.

[App page](https://appshunter.io/ios/app/eris/id6747496749)

Experience private AI conversations entirely on your device. This app offers offline access to multiple AI models, ensuring your data never leaves your iPhone or iPad. Enjoy fast, secure AI assistance without internet connectivity or subscriptions.

**Highlights:** 100% Private conversations, No internet required, Multiple AI models supported, Optimized for Apple Silicon, One-time download, use forever, Dark Mode support, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sandbook free?

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

### Is Eris. free?

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

### Which has better reviews, Sandbook or Eris.?

Sandbook is rated higher. Sandbook averages 4.6 out of 5 from 56 ratings, while Eris. averages 4.3 from 6 ratings.

### Do Sandbook or Eris. have ads?

Neither Sandbook nor Eris. shows ads.

### Which is updated more often, Sandbook or Eris.?

Sandbook ships an update every 7 months, and Eris. every 2 weeks. Most recently, Sandbook was updated on September 26, 2026 and Eris. on July 4, 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.*