# KeyPlus2 vs SMART HUD

The clearest difference is update cadence: KeyPlus2 at monthly against SMART HUD's every 4 months. 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.

KeyPlus2 ships an update monthly, SMART HUD every 4 months. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | KeyPlus2 | SMART HUD |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Free | — |
| Size | 114 MB | 4 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Special One Co., Ltd.](https://appshunter.io/developer/1521605263) | [RoadPia Co., Ltd.](https://appshunter.io/developer/366252913) |

## What reviewers say

### KeyPlus2

[App page](https://appshunter.io/ios/app/keyplus2-digital-key/id1583539390)

Easily control and share car doors using just your phone. Transform your vehicle into a smart car with this application.

**Highlights:** Digital car door control, Share car access remotely, Transform car into smart car, One phone control, Special life experience

**Features:** macOS Compatibility

**In-app purchases:** none


### SMART HUD

[App page](https://appshunter.io/ios/app/smart-hud/id1603048002)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KeyPlus2 free?

KeyPlus2 is free to download, with no in-app purchases.

### Is SMART HUD free?

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

### Do KeyPlus2 or SMART HUD have ads?

Neither KeyPlus2 nor SMART HUD shows ads.

### Which is updated more often, KeyPlus2 or SMART HUD?

KeyPlus2 ships an update monthly, and SMART HUD every 4 months. Most recently, KeyPlus2 was updated on October 3, 2026 and SMART HUD 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.*