# Calendar Clock vs bluTag

The clearest difference is review sentiment: bluTag at 50% against Calendar Clock's 0%. bluTag also leads on price (Free vs $0.99) and update cadence (every 2 months vs every 41 months). On ads, in-app purchases and device support there is nothing between them.

bluTag is free to download; Calendar Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calendar Clock ships an update every 41 months, bluTag every 2 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Calendar Clock | bluTag |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/blutag/id1468461470/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 16 MB |
| Requires iOS | 26.5 | **13.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Systemiko Inc.](https://appshunter.io/developer/680630947) | [Blulog Sp. Z o.o.](https://appshunter.io/developer/1451078620) |

## What reviewers say

### Calendar Clock

[App page](https://appshunter.io/ios/app/calendar-clock/id1451445740)

This app displays the current year, month, week, and time on a single screen with a clean design. It offers customizable theme colors and functions as a desk clock. The app disables device sleep mode while active.

**Highlights:** All-in-one screen display, Year, month, week, day, hour, minute, second, Switchable theme colors (dark, light, green, blue), Disables device sleep mode, Acts as a desk clock

**Features:** macOS Compatibility

**In-app purchases:** none


### bluTag

[App page](https://appshunter.io/ios/app/blutag/id1468461470)

Access temperature measurements from Blulog TLDL NFC dataloggers using your smartphone's NFC capabilities. View and retrieve data directly from the devices.

**Highlights:** Read temperature data, NFC datalogger access, Smartphone integration, Data retrieval

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calendar Clock free?

Calendar Clock costs $0.99, with no in-app purchases.

### Is bluTag free?

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

### Do Calendar Clock or bluTag have ads?

Neither Calendar Clock nor bluTag shows ads.

### Which is updated more often, Calendar Clock or bluTag?

Calendar Clock ships an update every 41 months, and bluTag every 2 months. Most recently, Calendar Clock was updated on October 15, 2026 and bluTag 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.*