# KRIZ vs Echo Books

The clearest difference is update cadence: Echo Books at every 5 days against KRIZ's fortnightly. KRIZ's advantage is iOS requirement (15.1 vs 18.0). 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.

KRIZ ships an update fortnightly, Echo Books every 5 days. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | KRIZ | Echo Books |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 46 MB | 7 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Kateryna Dimitrashko](https://appshunter.io/developer/6797778450) | [Azret Shogenov](https://appshunter.io/developer/1891747096) |

## What reviewers say

### KRIZ

[App page](https://appshunter.io/ios/app/kriz-reading-diary/id6797778448)

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

**In-app purchases:** none


### Echo Books

[App page](https://appshunter.io/ios/app/echo-books/id6804252188)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is KRIZ free?

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

### Is Echo Books free?

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

### Do KRIZ or Echo Books have ads?

Neither KRIZ nor Echo Books shows ads.

### Which is updated more often, KRIZ or Echo Books?

KRIZ ships an update fortnightly, and Echo Books every 5 days. Most recently, KRIZ was updated on October 4, 2026 and Echo Books on October 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.*