# AiDay vs 4D

The clearest difference is update cadence: AiDay at monthly against 4D's every 4 months. 4D's advantage is iOS requirement (9.0 vs 13.0). 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.

AiDay ships an update monthly, 4D every 4 months. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | AiDay | 4D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Size | 58 MB | 26 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [文杰 俞](https://appshunter.io/developer/946010348) | [4D Bios Inc.](https://appshunter.io/developer/1443704111) |

## What reviewers say

### AiDay

[App page](https://appshunter.io/ios/app/aiday/id1196180474)

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

**In-app purchases:** none


### 4D

[App page](https://appshunter.io/ios/app/4d-box/id1640428288)

**In-app purchases:** none


## Frequently asked questions

### Is AiDay free?

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

### Is 4D free?

4D is free to download, with no in-app purchases.

### Do AiDay or 4D have ads?

Neither AiDay nor 4D shows ads.

### Which is updated more often, AiDay or 4D?

AiDay ships an update monthly, and 4D every 4 months. Most recently, AiDay was updated on October 4, 2026 and 4D on October 6, 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.*