# CITIZEN Bluetooth Watch vs Key

The clearest difference is update cadence: CITIZEN Bluetooth Watch at every 4 months against Key's every 21 months. Key's advantage is iOS requirement (13.0 vs 15.6). 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.

CITIZEN Bluetooth Watch ships an update every 4 months, Key every 21 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | CITIZEN Bluetooth Watch | Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.9 (12 ratings)](https://appshunter.io/ios/app/citizen-bluetooth-watch/id1068381349/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 18.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 21 months |
| Monetization | Free | — |
| Size | 60 MB | 1 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CITIZEN WATCH CO.,LTD](https://appshunter.io/developer/434806605) | [Paul Barnes](https://appshunter.io/developer/1159692658) |

## What reviewers say

### CITIZEN Bluetooth Watch

[App page](https://appshunter.io/ios/app/citizen-bluetooth-watch/id1068381349)

This app connects your smartphone to compatible Bluetooth watches, offering automatic time synchronization, world time settings, and notifications for calls and messages. It also features alarm setting, a light level indicator for the watch's power, and tools to locate your smartphone or alert you if the connection is lost.

**Highlights:** Automatic time synchronization, World time settings, Call and message notifications, Alarm setting, Light level indicator, Smartphone search function, Link loss alert

**Features:** macOS Compatibility

**In-app purchases:** none


### Key

[App page](https://appshunter.io/ios/app/key-info/id1523681669)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CITIZEN Bluetooth Watch free?

CITIZEN Bluetooth Watch is free to download, with no in-app purchases.

### Is Key free?

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

### Do CITIZEN Bluetooth Watch or Key have ads?

Neither CITIZEN Bluetooth Watch nor Key shows ads.

### Which is updated more often, CITIZEN Bluetooth Watch or Key?

CITIZEN Bluetooth Watch ships an update every 4 months, and Key every 21 months. Most recently, CITIZEN Bluetooth Watch was updated on November 2, 2026 and Key on November 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.*