Comparison

O3 Alarm vs AlarmSMS Controller

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

Head to head
About

O3 Alarm

This security system app provides 360° protection for homes and small businesses. It allows remote monitoring, control of sensors, and customizable alerts for intrusions, floods, smoke, or gas. Manage your system, set routines, and receive notifications for enhanced safety and convenience.

Highlights
  • 360° protection with up to 50 wireless sensors
  • Intrusion, flood, smoke, and gas detection alerts
  • Customizable entry and exit delays
  • Adjustable siren duration and volume (up to 95 dB)
  • Smartphone, remote control, and panel interaction
  • RFID tag management and SMS notifications
  • Supports multiple users and smartphones
Read full description

Another signature system design from award-winning Chuango Security Technology Corporation, the O3 comes with world-class aesthetics and German-style precision craftsmanship. Chuango O3 is your 21st century security guard in disguise, made for wireless DIY comfort and convenience, and is particularly suitable for residential and small commercial applications. All you need is a Chuango O3 set and a regular SIM card. What your wire-free Chuango O3 can do for your home or small shop/SOHO: [360° Protection] Ideal for DIY home/shop improvement projects, the O3 can accommodate up to 50 wireless sensors and accessories, which can be easily “mounted” on walls or door/window frames with double-sided stickers. You will be the first to know – via this App – upon detection of intrusion, flood, smoke or gas. [360° Convenience] You can set exit and entry delays as you wish, so you and your family can go out and come back home at your own pace, without having to fumble around in your pocket for your mobile phone or remote control, to arm or disarm your Chuango O3. Pre-set routines can be entered so that your O3 will automatically guard your small shop or welcome you home right on the dot. Specific delays for specific zones are also possible. [360° Deterrence] Siren duration and volume can be adjusted per your need, with the maximum volume at 95 decibels. [360° Interaction] You can manage and interact with your O3 on your smartphone App, via your remote control, or directly on the panel. It can also double as a house phone to make or receive calls. [360° Sweet Home] The RFID tags can be renamed at will, and when used to disarm your O3 system, you immediately get an SMS text notification of who just came home. Multiple users and smartphones can be enabled to control and interact with one single O3 system once paired. You can take turns watching over your property and loved ones back home. Download your free Chuango O3 App and activate your smart and secure home now!

About

AlarmSMS Controller

Features
Read full description

AlarmSMS Controller is a simple, flexible GSM alarm control app for security systems that support SMS commands. Instead of typing the same SMS commands every time, you can create clean command buttons for your alarm system and use them whenever you need to arm, disarm, check status, activate stay mode, control siren functions, manage zones, or send any custom command supported by your GSM alarm panel. AlarmSMS Controller is not locked to one alarm brand. You can add your alarm phone number, create your own SMS commands, choose icons and colors, and organize everything in one easy-to-use interface. Main features: • Control compatible GSM alarm systems by SMS • Create custom arm, disarm, stay, status, siren, and zone commands • Add multiple alarm profiles • Save alarm phone numbers and command presets • Choose icons and colors for each command • Organize your most used security commands • Works with many GSM alarm panels that accept SMS commands • Backup and restore your setup • No account required • Data stored locally on your device Perfect for users who already have a GSM alarm panel and want a faster, cleaner way to send SMS control commands without remembering command codes manually. Important: AlarmSMS Controller does not monitor your alarm system, receive alarm events, or replace a professional security service. The app only helps you prepare and send SMS commands to compatible GSM alarm systems. SMS charges may apply depending on your mobile provider.

Screenshots

O3 Alarm4 screens
AlarmSMS Controller4 screens

Verdict

The call

The clearest difference is in-app purchases: O3 Alarm at none against AlarmSMS Controller's 1. O3 Alarm also leads on iOS requirement (7.0 vs 16.0). AlarmSMS Controller's advantage is update cadence (monthly vs every 7 months). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AlarmSMS Controller sells 1 one-off in-app purchase. O3 Alarm asks for nothing beyond the download.

UpkeepUpdate frequency

O3 Alarm ships an update every 7 months, AlarmSMS Controller monthly. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 7 level
O3 Alarm versus AlarmSMS Controller: the parameters behind the verdict, then further details
ParameterO3 AlarmAlarmSMS Controller
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 7 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS7.0 — better16.0
Further details — not scored
Size71 MB52 MB
Age rating4+4+
DeveloperChuango Security Technology CorporationGeorge Alexandrou

In-app purchases

None

O3 Alarm

No in-app purchases

1 purchases

AlarmSMS Controller

One-time1
  • AlarmSMS Pro$4.99

Questions

Is O3 Alarm free?
O3 Alarm is free to download, with no in-app purchases.
Is AlarmSMS Controller free?
AlarmSMS Controller is free to download, with in-app purchases available.
Do O3 Alarm or AlarmSMS Controller have ads?
Neither O3 Alarm nor AlarmSMS Controller shows ads.
Which is updated more often, O3 Alarm or AlarmSMS Controller?
O3 Alarm ships an update every 7 months, and AlarmSMS Controller monthly. Most recently, O3 Alarm was updated on October 10, 2026 and AlarmSMS Controller on October 15, 2026.

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