# PASSIE protocol vs Shift

The clearest difference is device support: PASSIE protocol at 3 against Shift's 1. On price, update cadence, ads and in-app purchases 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, Shift every 3 weeks. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PASSIE protocol | Shift |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 23 MB | 76 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [AppComm](https://appshunter.io/developer/807462024) | [Shift Tech BV](https://appshunter.io/developer/1786061925) |

## 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


### Shift

[App page](https://appshunter.io/ios/app/shift-sustainable-cities/id6739559733)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PASSIE protocol free?

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

### Is Shift free?

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

### Do PASSIE protocol or Shift have ads?

Neither PASSIE protocol nor Shift shows ads.

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

PASSIE protocol ships an update monthly, and Shift every 3 weeks. Most recently, PASSIE protocol was updated on October 13, 2026 and Shift on October 7, 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.*