# CA4K vs ColBlue

The clearest difference is ratings volume: CA4K at 10 against ColBlue's 1. CA4K also leads on iOS requirement (11.0 vs 15.0). ColBlue's advantage is update cadence (every 26 months vs every 54 months). On price, rating, 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.

On the App Store both sit at effectively the same score — 1.1 for CA4K against 1.0 for ColBlue. That said, the two scores are not equally well evidenced: CA4K has 10 ratings behind it against 1, so its average is the more settled of the two.

CA4K ships an update every 54 months, ColBlue every 26 months. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CA4K | ColBlue |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.1 (10 ratings)](https://appshunter.io/ios/app/ca4k/id1491432558/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/colblue/id1621727466/reviews) |
| Number of ratings | **10** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 54 months | **Every 26 months** |
| Monetization | Free | Free |
| Size | 0 MB | 89 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NAPCO Security Technologies](https://appshunter.io/developer/397342490) | [Millennium Group Inc.](https://appshunter.io/developer/1459017133) |

## What reviewers say

### CA4K

[App page](https://appshunter.io/ios/app/ca4k/id1491432558)

This app provides mobile access control for enterprise entry points like doors and elevators. Users can customize their approved access points and gain entry without physical credentials. It also offers optional administrator functions for system management.

**Highlights:** Mobile access to doors and elevators, Customize approved entry points, Log access without physical credentials, Administrator functions for system management, Enterprise electronic access control

**Features:** macOS Compatibility

**In-app purchases:** none


### ColBlue

[App page](https://appshunter.io/ios/app/colblue/id1621727466)

This app provides a secure and fast method to unlock doors equipped with specific Bluetooth readers using your smartphone. It serves as a convenient digital replacement for physical access cards and keys.

**Highlights:** Open doors with phone, Uses Bluetooth readers, Secure access, Fast unlocking, Replaces access cards

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

**In-app purchases:** none


## Frequently asked questions

### Is CA4K free?

CA4K is free to download, with no in-app purchases.

### Is ColBlue free?

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

### Which has better reviews, CA4K or ColBlue?

CA4K is rated higher. CA4K averages 1.1 out of 5 from 10 ratings, while ColBlue averages 1.0 from 1 ratings.

### Do CA4K or ColBlue have ads?

Neither CA4K nor ColBlue shows ads.

### Which is updated more often, CA4K or ColBlue?

CA4K ships an update every 54 months, and ColBlue every 26 months. Most recently, CA4K was updated on October 16, 2026 and ColBlue on October 11, 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.*