# Smart Scent Pro vs DL4D

The clearest difference is update cadence: DL4D at every 11 days against Smart Scent Pro's every 2 months. DL4D also leads on iOS requirement (13.0 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.

Smart Scent Pro ships an update every 2 months, DL4D every 11 days. The most recent releases landed on October 15, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Smart Scent Pro | DL4D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 11 days** |
| Size | 20 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [永锦 罗](https://appshunter.io/developer/1444842458) | [显强 余](https://appshunter.io/developer/1862084532) |

## What reviewers say

### Smart Scent Pro

[App page](https://appshunter.io/ios/app/smart-scent-pro/id1558962248)

**In-app purchases:** none


### DL4D

[App page](https://appshunter.io/ios/app/dl4d/id6756648259)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Scent Pro free?

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

### Is DL4D free?

DL4D is free to download, with no in-app purchases.

### Do Smart Scent Pro or DL4D have ads?

Neither Smart Scent Pro nor DL4D shows ads.

### Which is updated more often, Smart Scent Pro or DL4D?

Smart Scent Pro ships an update every 2 months, and DL4D every 11 days. Most recently, Smart Scent Pro was updated on October 15, 2026 and DL4D on September 30, 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.*