Comparison

Alarm 4 home + vs OP

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

About

Alarm 4 home +

Control your GSM wireless smart alarm system remotely. Easily arm, disarm, and manage your security system from your iPhone or iPod.

Highlights

Remote alarm system control
Arm and disarm functionality
GSM wireless system compatibility
User-friendly interface

Features

Read full description

你可以使用此软件来控制您的GSM无线智能报警系统LHD8003.您可轻松的对您的系统进行布防、撤防等操作。

About

OP

Read full description

OP-Link is a home security monitoring app that helps connect and manage webcams: dedicated to smarter surveillance with support for real-time video viewing, playback, cloud storage, voice intercom and mobility detection. After connecting the device on the mobile APP, users can view the screen viewed by the monitoring device beyond the trunk or even further away

Screenshots

Alarm 4 home +3 screens

OP3 screens

Verdict

The call

The clearest difference is update cadence: OP at every 2 months against Alarm 4 home +'s every 5 months. Alarm 4 home +'s advantage is device support and iOS requirement (8.0 vs 13.2). On price and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Alarm 4 home + ships an update every 5 months, OP every 2 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 5 level

Alarm 4 home + versus OP: the parameters behind the verdict, then further details
Parameter	Alarm 4 home +	OP
Price	Free	Free
Positive reviews	0.0% of reviews	—
Update frequency	Every 5 months	Every 2 months — better
Ads	No	—
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPod — better	—
Requires iOS	8.0 — better	13.2
Further details — not scored
Size	31 MB	85 MB
Age rating	4+	4+
Developer	China Security & Fire IOT Sensing Co., Ltd.	HAIXINDA TRADING LIMITED

In-app purchases

None

Alarm 4 home +

No in-app purchases

None

OP

No in-app purchases

Questions

Is Alarm 4 home + free?

Alarm 4 home + is free to download, with no in-app purchases.

Is OP free?

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

Which is updated more often, Alarm 4 home + or OP?

Alarm 4 home + ships an update every 5 months, and OP every 2 months. Most recently, Alarm 4 home + was updated on November 3, 2026 and OP on October 30, 2026.