# Blue Filter vs SMELLiT

The clearest difference is iOS requirement: Blue Filter at 11.0 against SMELLiT's 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.

## The numbers

| Metric | Blue Filter | SMELLiT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (60 ratings)](https://appshunter.io/ios/app/smellit/id6502876469/reviews)** |
| Number of ratings | — | **60** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Monthly |
| Monetization | — | Free |
| Size | 59 MB | 71 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Accessline Company For Technological Investment & General Trade](https://appshunter.io/developer/1579153284) | [Weizmann Institute of Science](https://appshunter.io/developer/533002684) |

## What reviewers say

### Blue Filter

[App page](https://appshunter.io/ios/app/blue-filter/id1617701866)

**Features:** macOS Compatibility

**In-app purchases:** none


### SMELLiT

[App page](https://appshunter.io/ios/app/smellit/id6502876469)

Participate in scientific research about the human sense of smell. Log daily scents and learn about olfaction. Earn rewards for consistent participation in this research project.

**Highlights:** Log daily scents, Learn about olfaction, Participate in research, Earn rewards, Randomized questionnaires

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Filter free?

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

### Is SMELLiT free?

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

### Do Blue Filter or SMELLiT have ads?

Neither Blue Filter nor SMELLiT shows ads.

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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.*