# TCT OTP vs U

The clearest difference is update cadence: U at every 4 days against TCT OTP's every 3 weeks. TCT OTP's advantage is iOS requirement (11.0 vs 14.0). 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.

TCT OTP ships an update every 3 weeks, U every 4 days. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TCT OTP | U |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Free |
| Size | 29 MB | 117 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IT Department, General Department of Taxation of Viet Nam](https://appshunter.io/developer/1589750684) | [Reda Kuehn](https://appshunter.io/developer/1724730981) |

## What reviewers say

### TCT OTP

[App page](https://appshunter.io/ios/app/tct-otp/id1636407223)

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

**In-app purchases:** none


### U

[App page](https://appshunter.io/ios/app/u-tel/id6475673902)

Engage in vibrant video calls and chats to foster meaningful connections. This platform helps you stay close to others, regardless of the distance, by offering innovative communication features.

**Highlights:** Vibrant video calls, Engaging chats, Meaningful connections, Innovative features, Community building

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TCT OTP free?

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

### Is U free?

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

### Do TCT OTP or U have ads?

Neither TCT OTP nor U shows ads.

### Which is updated more often, TCT OTP or U?

TCT OTP ships an update every 3 weeks, and U every 4 days. Most recently, TCT OTP was updated on October 9, 2026 and U on October 24, 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.*