# Keyin Plus vs TomorrowLetter

The clearest difference is iOS requirement: Keyin Plus at 13.0 against TomorrowLetter's 17.0. 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 | Keyin Plus | TomorrowLetter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Monetization | Free | — |
| Size | 35 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RAONARK Ltd.](https://appshunter.io/developer/1581955892) | [Moon gu Lee](https://appshunter.io/developer/1887272274) |

## What reviewers say

### Keyin Plus

[App page](https://appshunter.io/ios/app/keyin-plus/id1581955890)

Manage your smart door lock remotely. Receive real-time alerts for all lock activities, including locking, unlocking, and alarms. Automatically unlock your door when you approach and issue temporary keys to guests.

**Highlights:** Push notifications for lock events, Automatic door unlocking via Bluetooth, One-touch key issuance for family and guests, Detailed event history management, Door lock device settings, Manage multiple security devices

**Features:** macOS Compatibility

**In-app purchases:** none


### TomorrowLetter

[App page](https://appshunter.io/ios/app/tomorrowletter/id6815929757)

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

**In-app purchases:** none


## Frequently asked questions

### Is Keyin Plus free?

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

### Is TomorrowLetter free?

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

### Do Keyin Plus or TomorrowLetter have ads?

Neither Keyin Plus nor TomorrowLetter 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.*