Door Alert vs ColBlue
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Door Alert
This utility app acts as a simple security monitor for your smartphone. It detects unauthorized door entries or exits and notifies you immediately. It's designed to offer an extra layer of security for families with young children.
- Unauthorized exit/entry detection
- Immediate audible alarm
- Optional silent email/SMS alerts
- Works with or without cellular
- Low battery usage
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Introducing Door Alert, an easy-to-use security solution for smartphones! Monitors for unauthorized exits or entries, alerting you immediately. Just start the app, place the phone against the door, and it’s ready! Visit DoorAlertApp.com for more ideas and uses. The app uses an audible alarm. Optional features include sending an alert silently through email or SMS gateway. An additional peace of mind for families with young kids. Works with or without a cellular account. Notes: • the app is intended to be an additional security measure, not a replacement to conventional home and travel solutions • silent alerts are sent as-is; while every attempt is made to ensure delivery, there may be situations outside our control which can prevent delivery • when running, battery usage is increased by less than 1% per hour
ColBlue
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.
- Open doors with phone
- Uses Bluetooth readers
- Secure access
- Fast unlocking
- Replaces access cards
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ColBlue App is a simple, secure way to quickly open doors connected to Millennium Bluetooth readers directly from your phone. Simple to use, fast and secure, ColBlue App is a good replacement for your access cards and keys!
Screenshots
Verdict
The clearest difference is rating: Door Alert at 2.5 against ColBlue's 1.0. On price, ratings volume, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Door Alert holds the better App Store score, 2.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Door Alert ships an update every 33 months, ColBlue every 26 months. The most recent releases landed on November 1, 2026 and October 11, 2026 respectively.
| Parameter | Door Alert | ColBlue |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 33 months | Every 26 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 5 MB | 89 MB |
| Age rating | 4+ | 4+ |
| Developer | Russell Harper | Millennium Group Inc. |
Customer experience
Door Alert
ColBlue
In-app purchases
Door Alert
No in-app purchases
ColBlue
No in-app purchases
