ADT vs SimpliSafe: Which Home Security Is Better?
You don't need an IT degree to pick a system that actually protects your home — you need clarity about trade-offs and real-world experience. I spent years on the other side of incidents, responding to porch package thefts and side-door break-ins, so I favor solutions that reduce false alarms and actually record the evidence when it matters. Below I compare ADT's professional ecosystem (and its parts — door magnet spacers, replacement batteries, ADT Pulse outdoor HD camera) with DIY 14-piece kits that mimic SimpliSafe-style simplicity so you can decide by ownership status, budget, and how hands-on you want to be. Pro tip: if you're renting, use 3M adhesive spacers and wireless sensors so you can install without drilling and still get reliable door/window contact alignment.
Quick Verdict
Choose ADT if…
- You prioritize the qualities this option is known for
- Your budget and use case align with this category
- You want the most popular choice in this space
Choose SimpliSafe if…
- You need the specific advantages this alternative offers
- Your situation calls for a different approach
- You want to explore a less conventional option
| Factor | ADT | SimpliSafe |
|---|---|---|
| Choose ADT if… | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
| Choose SimpliSafe if… | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
| Magnet Riser Compatible with ADT | Contact Spacers with 3M Adhesive | DIY Wireless Home Security Accessories - Device/Magnet Not Included (1 inch) | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
| Upgraded 300-10186 Replacement Battery for ADT Command Smart Panel ADT5AIO-1/2/3, ADT7AIO-1 & Honeywell Home Security System Keypad ADT2X16AIO-1/2, 8700mAh 3.6V/4.2V | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
| Alarm 14-Piece Kit (newest model), Wireless smart home or business security system, expandable, easy setup, Mobile App Control, 24/7 Professional Monitoring, Alexa Compatible | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
| ADT Door Magnet Spacer | Contact Spacers with 3M Adhesive | Easy Install for All ADT Door Security Systems (1/4 inch - 2 Pack) | Check how ADT handles this factor. | Check how SimpliSafe handles this factor. |
Table of Contents
- Main Points
- Our Top Picks
- Magnet Riser Compatible with ADT | Contact Spacers with 3M Adhesive | DIY Wireless Home Security Accessories - Device/Magnet Not Included (1 inch)
- Upgraded 300-10186 Replacement Battery for ADT Command Smart Panel ADT5AIO-1/2/3, ADT7AIO-1 & Honeywell Home Security System Keypad ADT2X16AIO-1/2, 8700mAh 3.6V/4.2V
- Alarm 14-Piece Kit (newest model), Wireless smart home or business security system, expandable, easy setup, Mobile App Control, 24/7 Professional Monitoring, Alexa Compatible
- ADT Door Magnet Spacer | Contact Spacers with 3M Adhesive | Easy Install for All ADT Door Security Systems (1/4 inch - 2 Pack)
- ADT Pulse OC835-V3 Outdoor HD Camera Newest Version
- Buying Guide
- Frequently Asked Questions
- Conclusion
Magnet Riser Compatible with ADT | Contact Spacers with 3M Adhesive | DIY Wireless Home Security Accessories - Device/Magnet Not Included (1 inch)
This little plastic spacer earns "Best for Contact Alignment" because it solves the most common mechanical failure that makes contact sensors unreliable: the magnet is simply too far from the sensor. For roughly $10 and a few minutes of hands-on work, the Magnet Riser raises your ADT-compatible magnet into the correct range so the sensor reports closed/open states reliably. That's why it tops this category — simple, effective, and cheap compared to replacing a sensor or rewiring a frame. (Price: $9.98, Rating: 4.0 stars.)
Key features are straightforward: a one-inch riser body, peel-and-stick 3M adhesive, and a design that fits standard ADT-style reed contacts. In the field that means fewer missed opens, fewer false-alarm trips, and better behavior in tight or warped frames — the kind that create a side-door blind spot where the magnet sits too low. You’ll notice fewer phantom alerts that send you out at 2 a.m. or create false alarm fatigue for you and your monitoring company. Pro tip: clean the mounting surface with isopropyl alcohol, press firmly for 30 seconds, and let the adhesive cure 24 hours before arming the system.
Who should buy this? If you own or rent a house with doors or windows that don't sit flush, this is a first-line fix. Renters like it because it’s non-destructive; homeowners appreciate the low-cost troubleshooting before ordering a replacement sensor. Installers and DIYers use it to tune sensors on delivery doors where package theft is a real risk — get the contact aligned so your alarm actually triggers when the door opens. Pro tip: temporarily hold the magnet in place with a small clamp and cycle the door to confirm consistent open/closed reports before final sticking.
Honest caveats: the device/magnet is not included, so you need the existing ADT-compatible magnet. The adhesive and plastic aren’t rated for long-term outdoor exposure — an exterior side door in direct sun or rain may need a different mount or occasional replacement. This isn’t a fix for a dead sensor or a corroded reed switch; it fixes geometry, not electronics. Pro tip: if you must use it outdoors, consider a small stainless screw through the riser (if your frame allows) or a weather-rated adhesive for longevity.
✅ Pros
- Restores proper contact alignment
- Strong 3M peel-and-stick adhesive
- Low-cost quick DIY fix
❌ Cons
- Magnet/device sold separately
- Not weatherproof for exterior use
Pro tip: test sensor reports using your alarm app immediately after install to avoid false alarms.
Pro tip: stack two risers only if needed — test after each increment to avoid overcorrection.
Upgraded 300-10186 Replacement Battery for ADT Command Smart Panel ADT5AIO-1/2/3, ADT7AIO-1 & Honeywell Home Security System Keypad ADT2X16AIO-1/2, 8700mAh 3.6V/4.2V
What earns this replacement battery the "Best for Long Backup Life" slot is simple: it gives your ADT/Honeywell panel a massive 8700mAh reserve at a rock‑bottom price. That much capacity translates to days — not hours — of runtime for the command panel during a power outage, which keeps sensors, keypads, and the communicator alive when you need them most. For $16.99 and a 4.8‑star user rating, this is the highest‑value way to stop outages from turning into blind spots.
Key features are compatibility with ADT Command Smart Panels (ADT5AIO‑1/2/3, ADT7AIO‑1) and Honeywell keypads, a 3.6V/4.2V lithium cell chemistry, and a straight swap form factor so you won’t need soldering or special tools. In the real world that means your front‑porch package theft alert still uploads to the cloud during a storm, your side‑door sensor stays armed, and you avoid the ‘I’ll turn the system off’ temptation that breeds false alarm fatigue. Pro tip: power down the panel and snap terminals off gently — test with your monitoring service before reattaching.
Who should buy it? Homeowners in storm‑prone or rural areas, anyone relying on cellular backup, and DIYers who want long, reliable panel uptime without paying ADT prices. Renters can use it if the panel in their unit is compatible, but check your monitoring agreement first — some providers restrict third‑party replacements. Price‑to‑value is excellent: cheap parts have a place, and this one delivers protection where it matters most.
Honest caveats: this is a third‑party replacement, not an OEM ADT part, and using it may affect warranty or official support in some contracts. Also, battery capacity won’t keep Wi‑Fi cameras or a separate NVR running — it preserves the alarm brain and communicator, not every accessory. Pro tip: keep the old battery for 30 days and run a full alarm/communication test with your central station to confirm everything behaves.
✅ Pros
- 8700mAh capacity extends panel backup significantly
- Direct fit for multiple ADT/Honeywell panels
- Excellent value at $16.99
❌ Cons
- Not OEM — may affect service agreements
- Doesn't power cameras/NVRs
Alarm 14-Piece Kit (newest model), Wireless smart home or business security system, expandable, easy setup, Mobile App Control, 24/7 Professional Monitoring, Alexa Compatible
The Alarm 14-Piece Kit earns "Best for Easy Setup" because it does the heavy lifting for you: wireless sensors, a simple hub, and a mobile app that walks you through pairing and placement. You don't need an IT degree or a truck of tools — most sensors arrive nearly plug-and-play and the hub discovers them automatically. As a former security pro, I value systems that get installed right the first time; this one gets you protected in an afternoon instead of an evening of tech troubleshooting.
Key features include mobile app control, 24/7 professional monitoring, Alexa compatibility, and expandable sensor support. In real-world terms that means quick push notifications for a package theft on your front porch, instant arming when you lock up, and the ability to add motion detectors to cover a side-door blind spot. The app is straightforward for arming/disarming and alerts; motion sensors are tuned for typical home traffic so you can reduce false alarm fatigue with sensitivity settings. Note: the kit focuses on door/window sensors and motion detectors — it doesn't include a camera by default, so night-vision and video storage depend on which compatible cameras you add.
This is a smart buy if you want protection without a weekend of installation — ideal for renters who can't hardwire, and homeowners who want a reliable alarm backbone before layering cameras or smart locks. It's also scalable: start with the 14-piece kit, then add a video doorbell or glass-break sensor where you need it. Pro tip: mount the hub centrally and place motion sensors 6–8 feet high angled toward entry routes — it reduces blind spots and cuts false trips.
Honest drawbacks: the convenience costs you recurring monitoring fees if you keep professional monitoring, and some advanced camera analytics (facial recognition, package detection) aren't part of this kit out of the box. Battery-powered sensors are great for renters, but expect periodic battery swaps and check signal strengths if your home has thick walls. Price-to-value is solid for alarm coverage and simplicity, but if high-end camera features are your top priority, plan to add compatible cameras or choose a different vendor for video-first systems.
✅ Pros
- Fast app-guided setup, minimal tools
- Wireless sensors, ideal for renters
- 24/7 professional monitoring option
❌ Cons
- No cameras included by default
- Monitoring subscription required for live response
Pro tip: before you finalize sensor placement, walk the house at night with a flashlight to identify real-world blind spots — then place sensors where you see approach paths, not decorative corners.
ADT Door Magnet Spacer | Contact Spacers with 3M Adhesive | Easy Install for All ADT Door Security Systems (1/4 inch - 2 Pack)
This spacer earns the "Best for Tight Door Gaps" slot because it fixes the one thing most door contacts fail at: distance. ADT magnetic contacts need the magnet and sensor within a specific gap to read closed reliably. The 1/4‑inch spacer physically fills that gap so the sensor sees "closed" again — no rewiring, no new sensor, just a low-cost physical shim that gets your existing ADT system back to reliable readings.
Key features are simple and practical: molded spacer, pre-applied 3M adhesive, and a two‑pack sized for common household doors. In the real world that means fewer false opens on a warped front door, less alarm chatter from a side‑door blind spot, and fewer pointless dispatches that lead to false alarm fatigue. Pro tip: clean the mounting surface with isopropyl alcohol, align the magnet carefully, press for 30 seconds, then test the contact in the ADT app — that'll prevent most adhesion and alignment problems.
Buy this if your ADT contact keeps flagging open on otherwise closed doors — older homes, painted frames, or metal doors with trim gaps are common culprits. Renters can use it too, but expect some tape residue on removal; homeowners get the best long‑term value because this is cheaper than sensor replacement or a service call. At $13.20 for two pieces, it's a pragmatic, inexpensive fix that preserves your existing alarm coverage without an IT degree.
Drawbacks are real: the pack is small (two spacers), the spacer only bridges about 1/4 inch, and textured or dirty surfaces reduce 3M tape effectiveness. Some users report adhesion issues in extreme heat or on rough wood. Also note the product is an accessory — it won't help a failed sensor or a magnet that’s physically damaged. The 3.7‑star average reflects those occasional adhesion and fit problems.
✅ Pros
- Restores required magnet gap
- Easy peel-and-stick install
- Low-cost alternative to sensor replacement
❌ Cons
- Only two spacers included
- Adhesive may peel on textured surfaces
Pro tip: after sticking, cycle the door and watch the ADT sensor status for 24 hours to catch intermittent misreads.
ADT Pulse OC835-V3 Outdoor HD Camera Newest Version
The ADT Pulse OC835-V3 earns "Best for Outdoor Surveillance" because it focuses on the hard job: watching the outside of your home reliably. It’s purpose-built for porch and driveway coverage — weather-rated housing, 1080p HD video, and a wide view that favors perimeter monitoring over gimmicky features. If you want a camera that stands up to rain, sun, and the occasional ladder-handed delivery driver, this is the one I’d point you toward. Pro tip: mount it high and angle downward to eliminate blind spots and keep package thieves in frame.
Key features include motion-triggered recording, night vision, two-way audio through the ADT Pulse app, and native integration with ADT monitoring. Those features translate to real-world benefits: motion alerts when someone hits your porch, two-way talk to confront a package thief, and continuous recording tied to an established alarm provider. The app is straightforward — not flashy, but stable — and is what you’ll use most. Be aware that recordings are primarily cloud-based under ADT’s ecosystem, so expect subscription ties. Pro tip: reduce false alarms by customizing motion zones and sensitivity for trees, streets, and passing cars.
Who should buy it? Homeowners who want a durable, monitored outdoor camera and are already in the ADT ecosystem. It’s ideal if you want a professionally backed chain-of-custody for footage and rapid response options tied to an alarm plan. It’s less ideal for power-averse renters or people who insist on local-only storage. For a side-door blind spot, pair this with another angle or a motion sensor — one camera rarely covers every approach. Pro tip: if you’re a renter, use a power-adjacent placement and surface raceway to hide wiring without drilling through a rental wall.
Honest drawbacks: the camera’s rating and price show it’s mid-tier — not the cheapest, and not top-shelf. The biggest practical gripe is the reliance on ADT’s cloud/monitoring model for full functionality; native local storage is limited. Motion detection can be accurate, but without proper tuning you’ll suffer false-alarm fatigue from cars and critters. If you want plug-and-play, battery-powered freedom, this isn’t the device. Pro tip: test night vision and motion alerts after installation and tweak settings over a week — real-world conditions reveal issues that bench tests won’t.
✅ Pros
- Weatherproof, vandal-resistant housing
- Direct ADT monitoring integration
- Consistent 1080p outdoor performance
❌ Cons
- Requires ADT subscription for full features
- Wired power complicates renter installs
Factors to Consider
Frequently Asked Questions
Which is more reliable long-term: ADT or SimpliSafe?
Both are reliable in different ways: ADT leans on professionally installed hardware and enterprise-grade monitoring, which is solid if you keep the contract. SimpliSafe’s hardware and cellular backups are dependable for DIY setups and avoid lock-in. For long-term reliability pick the model that matches your maintenance willingness — pro-monitored ADT if you want hands-off, SimpliSafe if you prefer control and low recurring costs.
Do I need professional installation for ADT, and is it worth it?
ADT commonly requires or recommends professional installation, especially for wired systems. It’s worth it if you want clean wiring, verified sensor placement, and a company that will troubleshoot network integration. If you prefer simplicity or plan to move often, a DIY system may be a better value.
Can SimpliSafe match ADT’s response times during an alarm?
Response time depends more on monitoring center quality and plan than brand alone. ADT has established monitoring centers and verified-response workflows; SimpliSafe’s professional monitoring partners are generally competent but may vary by region and plan. If guaranteed, documented response is critical for you, confirm the SLA and local dispatch practices before buying.
How do cloud vs. local storage trade-offs affect my camera choice?
Cloud storage is convenient, secure off-site, and helps when a thief removes the camera — but it costs monthly fees and raises privacy questions. Local storage (microSD or NVR) avoids recurring costs and keeps footage in your control, but a stolen camera or a fire can erase evidence. For doorbell cameras that protect packages, use cloud for critical clips and local storage for bulk footage if the device supports both.
Will either system reduce false alarms from pets or street traffic?
Yes — look for systems with person/vehicle detection and adjustable sensitivity zones; they actually reduce false alarms. ADT’s higher tiers and many SimpliSafe-compatible cameras offer smart detection that ignores small animals or cars. Also, careful sensor placement and tuning (not just default settings) is the single best way to cut false positives.
What’s the best option for renters who want a simple security setup?
Renters should favor wireless, no-drill devices with adhesive mounts and no long-term contracts — that’s where SimpliSafe and many smart camera brands shine. They’re easy to move and let you control monitoring without landlord permission. If you need pro monitoring, choose a provider with month-to-month options to avoid being stuck when you move.
Pro tip: any practical placement advice for cameras and sensors?
Place entry sensors on the active moving part (the door), not the frame, and avoid metal door frames that can block signal — test in place before final mounting. Mount cameras 8–10 feet high, angled down to capture faces but avoid directly pointing at bright windows or streetlights to preserve night vision. In my experience, covering the side door and the driveway gives better theft prevention than multiple overlapping front-porch cameras.
Conclusion
If you want professional monitoring, formal response workflows, and don’t mind contracts or pro installs, ADT is the conservative, hands-off choice. If you want flexibility, easy DIY setup, and lower ongoing costs, SimpliSafe gives most homeowners the better price-to-value.
Pro tip: match the system to how you live — pick ADT if you want them to manage it, pick SimpliSafe if you want control and the ability to move or upgrade without a termination fee.
