# 451F vs Youday CRM

The clearest difference is update cadence: Youday CRM at every 4 months against 451F's every 11 months. 451F's advantage is iOS requirement (11.0 vs 15.0). 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.

451F ships an update every 11 months, Youday CRM every 4 months. The most recent releases landed on October 3, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 451F | Youday CRM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 months** |
| Size | 26 MB | 10 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [ACD Groupe](https://appshunter.io/developer/1033556694) | [Youday](https://appshunter.io/developer/1483957967) |

## What reviewers say

### 451F

[App page](https://appshunter.io/ios/app/451f/id1417217337)

**In-app purchases:** none


### Youday CRM

[App page](https://appshunter.io/ios/app/youday-crm/id1483957968)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 451F free?

451F is free to download, with no in-app purchases.

### Is Youday CRM free?

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

### Do 451F or Youday CRM have ads?

Neither 451F nor Youday CRM shows ads.

### Which is updated more often, 451F or Youday CRM?

451F ships an update every 11 months, and Youday CRM every 4 months. Most recently, 451F was updated on October 3, 2026 and Youday CRM on October 20, 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.*