# Zenn OTP vs Kale Smart

The clearest difference is update cadence: Zenn OTP at every 6 weeks against Kale Smart's every 18 months. Kale Smart's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, 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.

Zenn OTP ships an update every 6 weeks, Kale Smart every 18 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Zenn OTP | Kale Smart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 18 months |
| Size | 32 MB | 414 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Zenn](https://appshunter.io/developer/1607161974) | [Kale Kilit](https://appshunter.io/developer/1502829908) |

## What reviewers say

### Zenn OTP

[App page](https://appshunter.io/ios/app/zenn-otp/id6443748609)

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

**In-app purchases:** none


### Kale Smart

[App page](https://appshunter.io/ios/app/kale-smart/id6743434041)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Zenn OTP free?

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

### Is Kale Smart free?

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

### Do Zenn OTP or Kale Smart have ads?

Neither Zenn OTP nor Kale Smart shows ads.

### Which is updated more often, Zenn OTP or Kale Smart?

Zenn OTP ships an update every 6 weeks, and Kale Smart every 18 months. Most recently, Zenn OTP was updated on October 24, 2026 and Kale Smart 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.*