# PASSIE protocol vs Scentech

The clearest difference is update cadence: Scentech at daily against PASSIE protocol's monthly. 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.

PASSIE protocol ships an update monthly, Scentech daily. The most recent releases landed on September 27, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | PASSIE protocol | Scentech |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Size | 23 MB | 44 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AppComm](https://appshunter.io/developer/807462024) | [Scentech](https://appshunter.io/developer/1825553878) |

## What reviewers say

### PASSIE protocol

[App page](https://appshunter.io/ios/app/passie-protocol/id6443723154)

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

**In-app purchases:** none


### Scentech

[App page](https://appshunter.io/ios/app/scentech/id6748377067)

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

**In-app purchases:** none


## Frequently asked questions

### Is PASSIE protocol free?

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

### Is Scentech free?

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

### Do PASSIE protocol or Scentech have ads?

Neither PASSIE protocol nor Scentech shows ads.

### Which is updated more often, PASSIE protocol or Scentech?

PASSIE protocol ships an update monthly, and Scentech daily. Most recently, PASSIE protocol was updated on September 27, 2026 and Scentech on September 21, 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.*