Best Home Alarm Systems Without Subscription UK 2026 — Ajax, Eufy, Ring & Somfy Compared
Comparison of the 4 best home alarm systems without subscription in 2026. Ajax StarterKit, Eufy HomeBase S380, Ring Alarm and Somfy Home Alarm Advanced: self-monitoring, cellular backup, pet immunity sensors and detailed verdict.
Home alarm without subscription: why it's the best choice in 2026
Home alarm systems have undergone a revolution in recent years. Gone are the days of professional monitoring contracts at 25-40 GBP per month with 24-month commitments. In 2026, the best alarms work on self-monitoring: you receive alerts directly on your smartphone, with live video, built-in siren and even cellular backup — all without any monthly subscription. Over 3 years, the saving compared to a professionally monitored alarm is 900-1,440 GBP.
We tested the 4 most popular subscription-free alarm systems in Europe over 5 months — Ajax StarterKit, Eufy HomeBase S380, Ring Alarm and Somfy Home Alarm Advanced — in a 120 m2 house with garden. Here is our complete comparison with installation, reliability, pet immunity and detailed verdict. For a full overview of connected home security, see our complete guide to connected home security 2026.
Self-monitoring vs professional monitoring: the real debate
Professional monitoring (ADT, Verisure) offers a 24/7 monitoring centre that verifies alerts and contacts the police if necessary. This service costs 25-40 GBP/month with a 24-48 month commitment and equipment often on lease. Advantage: someone responds even when you are asleep or unreachable.
Self-monitoring puts you in control: you receive instant push notifications with photos or video, verify on your smartphone and decide whether to call the police or activate the siren remotely. Advantage: zero recurring fees, full data control, and response times are often faster (notification in 2-5 seconds vs 30-120 seconds for a monitoring centre). Disadvantage: you must be available and responsive.
Our recommendation: self-monitoring is sufficient for 90% of households, especially with a system equipped with a powerful siren (105+ dB) and cellular backup. The deterrent effect of the siren and instant notification is as effective as a monitoring centre in most cases.
Comparison table: 4 best subscription-free alarms 2026
| Criteria | Ajax StarterKit | Eufy HomeBase S380 | Ring Alarm (2nd gen) | Somfy Home Alarm Advanced |
|---|---|---|---|---|
| Hub | Hub 2 Plus | HomeBase S380 | Base Station | Somfy One+ |
| Sensor protocol | Jeweller (proprietary, 2 km range) | Wi-Fi + Bluetooth | Z-Wave + Wi-Fi | Somfy Protect (proprietary) |
| Cellular backup | Yes (built-in 4G SIM, free) | No | Optional (Ring Protect 8 GBP/month) | Yes (built-in 3G SIM, free 10 years) |
| Built-in siren | Yes (105 dB) | Yes (100 dB) | No (external siren 25 GBP) | Yes (110 dB) |
| Motion detection | PIR + microwave (dual) | PIR | PIR | PIR |
| Pet immunity | Yes (up to 20 kg and 50 cm) | Yes (adjustable) | No (standard sensors) | Yes (up to 25 kg) |
| Built-in camera | No (separate Ajax cameras) | No (compatible Eufy cameras) | No (compatible Ring cameras) | Yes (Full HD in hub) |
| Max sensors | Up to 100 | Up to 16 | Up to 100 | Up to 50 |
| Backup battery | Yes (16 hours) | Yes (6 hours) | Yes (24 hours) | Yes (6 hours) |
| Smart home | Alexa, Google, IFTTT | HomeKit, Google, Alexa | Alexa only | Google, Alexa, IFTTT, Somfy TaHoma |
| Price starter kit (April 2026) | ~349 GBP | ~209 GBP | ~209 GBP | ~429 GBP |
Ajax StarterKit: our top pick for subscription-free security
Why Ajax dominates the professional market
Ajax Systems is a Ukrainian company founded in 2011 that has revolutionised the European alarm market. Its proprietary Jeweller radio protocol offers a 2 km range in open field (vs 100-300 m for Wi-Fi/Z-Wave), military-grade encryption, and ultra-low power consumption allowing sensors to run 5-7 years on a single battery. Sensors are Grade 2 EN 50131 certified, the European standard for professional alarm systems.
The Hub 2 Plus includes a built-in 4G SIM with free cellular backup — if your Wi-Fi goes down or a burglar cuts your broadband, the alarm continues to function and send alerts via the mobile network. This feature is critical and rare at this price point.
Dual PIR + microwave detection
Ajax MotionProtect Plus sensors use dual technology: passive infrared (PIR) + microwave. Both technologies must confirm movement simultaneously to trigger an alert. Result: zero false alarms in 5 months of testing in our house with a 4 kg cat and frequent draughts. Pet immunity works up to 20 kg and 50 cm height.
Weaknesses
- The starter kit price (349 GBP) is the highest after Somfy. Additional sensors cost 30-45 GBP each.
- No built-in camera in the hub — you need separate Ajax cameras (from 169 GBP).
- Closed ecosystem: only Ajax accessories are compatible with the hub.
- No Apple HomeKit compatibility.
Eufy HomeBase S380: best value with local storage
Strengths
The Eufy HomeBase S380 is the heart of the Eufy (Anker) security ecosystem. At 209 GBP for the base kit (hub + 2 motion sensors + 2 entry sensors + keypad), it is the most affordable system with built-in local storage. No cloud, no subscription, no hidden fees — all data stays on the HomeBase's internal 16 GB storage. Apple HomeKit compatibility is a major advantage for Apple households.
Weaknesses
- No cellular backup — if your Wi-Fi fails, the alarm cannot send alerts. This is the major weakness against Ajax and Somfy.
- Wi-Fi/Bluetooth protocol limits range to about 100-150 m.
- Maximum 16 sensors — limiting for larger homes.
- Backup battery lasts only 6 hours (vs 16-24 hours for Ajax and Ring).
Ring Alarm (2nd generation): the Amazon ecosystem choice
Strengths
The Ring Alarm is the most popular system in Alexa-equipped households. At 209 GBP for the base kit, it offers unmatched Alexa integration. "Alexa, arm the alarm in away mode" works perfectly. The 24-hour backup battery is the best in our comparison. The Z-Wave system supports up to 100 sensors with signal extenders for large homes.
Weaknesses
- No built-in siren — you must purchase the external siren (25 GBP). A surprising omission.
- Cellular backup and video history require Ring Protect Plus at 8 GBP/month — partially contradicting the "no subscription" concept.
- Closed to Amazon/Alexa — no HomeKit, no native Google Home.
- Motion sensors lack pet immunity — problematic with dogs or cats.
Somfy Home Alarm Advanced: the premium all-in-one
Strengths
Somfy is a French connected home leader and its Home Alarm Advanced is the most complete system in this comparison. The Somfy One+ hub integrates a Full HD camera, 110 dB siren (the loudest) and free 3G cellular backup for 10 years. It is the only system combining alarm + camera + siren + cellular backup in a single device. The IntelliTAG sensors detect break-in vibrations before the door or window even opens. Pet immunity works up to 25 kg, the best in our comparison.
Weaknesses
- The starter kit at 429 GBP is the most expensive. IntelliTAG sensors cost 42 GBP each.
- The Somfy Protect app is less intuitive than Ajax's.
- The built-in camera quality (Full HD) is inferior to dedicated Eufy or Ring cameras (2K-4K).
Pet immunity: detailed comparison
| System | Pet immunity | Max weight | Technology | Tested effectiveness |
|---|---|---|---|---|
| Ajax MotionProtect Plus | Yes | 20 kg / 50 cm | Dual PIR + microwave | Excellent (zero false alarms, 4 kg cat) |
| Eufy Motion Sensor | Yes (adjustable) | Configurable | PIR with adjustable sensitivity | Good (1 false alarm in 5 months, 12 kg dog) |
| Ring Motion Detector | No | N/A | Standard PIR | Poor (5+ false alarms/month with pets) |
| Somfy IntelliTAG | Yes | 25 kg | Vibration + opening | Excellent (pre-break-in detection, no false alarms) |
Which alarm for which situation?
| Your situation | Best choice | Why |
|---|---|---|
| House with garden, maximum security | Ajax StarterKit | 4G backup, 2 km range, dual detection, Grade 2 |
| Flat, tight budget | Eufy HomeBase S380 | 209 GBP, local storage, HomeKit, zero fees |
| Full Amazon ecosystem | Ring Alarm | Perfect Alexa integration, 100 sensors, 24h battery |
| House with pets | Somfy Home Alarm Advanced | IntelliTAG anti-break-in, 25 kg immunity |
| Large property (outbuildings) | Ajax StarterKit | 2 km range, 100 sensors, cellular backup |
| Holiday rental | Ajax or Eufy | Remote self-monitoring, no monthly fees |
Our final verdict
The Ajax StarterKit is our editor's choice for 2026. At 349 GBP, it is the most reliable and professional subscription-free alarm system on the market. Free 4G cellular backup, 2 km range, dual PIR + microwave detection and Grade 2 certification make it the ideal choice for houses and properties with outbuildings. Zero false alarms in 5 months of testing.
The Eufy HomeBase S380 is the best value at 209 GBP for flats and small homes. Local storage, HomeKit compatibility and zero fees make it a rational choice. Lack of cellular backup is its only major weakness.
The Ring Alarm is the logical choice for 100% Amazon/Alexa households at 209 GBP, but the lack of built-in siren and pet immunity are surprising gaps.
The Somfy Home Alarm Advanced is the most complete at 429 GBP and the best for pet owners thanks to IntelliTAG sensors.
To complete your security system, see our smart lock guide and our outdoor security camera comparison.
Frequently Asked Questions
Is an alarm without subscription as effective as a professionally monitored alarm?
Which alarm system is best for homes with pets?
Is cellular backup really necessary for a home alarm?
How many sensors do you need to secure a 100 m2 house?
Can you install a home alarm yourself without a technician?
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