FOCUS vs Four
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FOCUS
This application allows users to easily control compatible home alarm systems with GSM switches. It automates the process of sending SMS commands, eliminating the need for manual text input.
- Remote system control
- GSM switch integration
- Automated SMS commands
- Easy alarm activation/deactivation
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THIS APP HELP YOU TO CONTROL YOUR SYSTEM EASILY.WE PRODUCT THIS APP FOR REMOT CONTROL SYSTEM. THE APP IS DESIGNED SPECIFICALLY FOR PEOPLE WHO WANT TO TURN ON OR OFF COMPATIBLE HOME ALARM SYSTEMS WITH GSM SWITHCHES BY USING THIS APP YOU DON’T NEED TO TYPE THE SPECIFIC SMS CONTENT AND FILL THE TEXT FOR YOU YOUR FEEDBACK WOULD HELP US TO IMPROVE THIS APP
Four
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1. After logging in to the APP, you can simultaneously view the devices installed in the sensor cloud platform; 2. After the account obtains the corresponding permissions, it can edit and delete the installed equipment and other management operations; 3. After switching the video device, you can view, play back and capture the installed video device in real time; 4. When the device has an alarm, the alarm will be displayed in the device alarm column, and it will also be pushed to the mobile phone through the message; 5.The APP also provides functions such as notification announcement, message setting, language setting, beginner's guide, and personal information editing.
Screenshots
Verdict
The clearest difference is update cadence: FOCUS at monthly against Four's every 2 months. On price, ads, in-app purchases and device support 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.
FOCUS ships an update monthly, Four every 2 months. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.
| Parameter | FOCUS | Four |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 58 MB |
| Age rating | 4+ | 17+ |
| Developer | moztec | Xiamen Sixin IoT Technology Co., Ltd. |
In-app purchases
FOCUS
No in-app purchases
Four
No in-app purchases
