The short answer
Choose SimpliSafe if you want an affordable, contract-free system you install yourself - it's the DIY benchmark, fully wireless, with optional professional monitoring around $20-$30/month you can start or stop anytime. Choose ADT if you want an established, professionally installed system backed by one of the largest 24/7 monitoring networks in the country, and you don't mind a multi-year contract and higher total cost for that peace of mind.
Neither is "better" outright - they're built for different buyers. Below we compare them honestly on installation, cost, contracts, monitoring and who each one actually suits.
SimpliSafe vs. ADT at a glance
| SimpliSafe | ADT | |
|---|---|---|
| Type | DIY, wireless | Pro install & monitoring |
| Installation | Self-install | Professional |
| Monitoring | Optional, ~$20-$30/mo | Professional, 24/7 |
| Contract | None - month to month | Often ~36 months |
| Best for | Renters, small homes, DIYers | Established-brand buyers |
See how both stack up against the rest of the field in our best home security systems rankings.
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Installation: DIY vs. professional
SimpliSafe is self-install. The system is fully wireless with peel-and-stick sensors, so most people set it up in under an hour with no tools and no technician. That makes it renter-friendly and easy to take with you if you move - but coverage is only as good as where you place the sensors, so you're responsible for getting that right.
ADT is professionally installed. A technician comes to your home, places and configures everything, and makes sure the system is wired into the monitoring network correctly. That removes the guesswork and is reassuring for larger homes or anyone who'd rather not DIY - but it means scheduling an appointment, and it's part of why ADT costs more overall.
If the DIY-vs-pro decision is the crux for you, our installation cost guide breaks down what each approach really runs.
Cost and contracts: the biggest difference
SimpliSafe: you buy the equipment once (basic kits from around $250), and monitoring is optional and month-to-month - roughly $22.99-$32.99/month for most homes, with no cancellation fee ever. You can run it self-monitored for $0/month if you only want a local siren and app alerts. Full breakdown in our SimpliSafe monthly cost guide.
ADT: plans have historically involved a multi-year contract (often around 36 months), with professional monitoring and a higher total cost than DIY brands. You get the backing of an established nationwide network, but cancelling early can mean termination fees. See our ADT cost breakdown for the details.
The honest takeaway: SimpliSafe wins clearly on flexibility and up-front cost; ADT asks for commitment in exchange for a hands-off, fully managed experience.
Monitoring and response
Both offer 24/7 professional monitoring with dispatch - the difference is how it's packaged. With ADT, professional monitoring is the core of the product: it's one of the largest, most established monitoring networks in the country, and it's included as part of every plan. With SimpliSafe, professional dispatch is optional - it only happens if you add a monitoring plan. Without one, SimpliSafe is a local alarm with app alerts, and you'd call the police yourself.
For a real emergency, the two features that matter most are 24/7 professional dispatch and cellular backup so the system stays connected if WiFi or power drops. ADT includes these as standard; with SimpliSafe, make sure you're on a monitoring plan that covers them (its Standard plan and up do).
Which should you actually choose?
Pick SimpliSafe if you're a renter, in a small-to-medium home, on a budget, or you simply value flexibility - no contract, low monthly cost, easy DIY setup, and you can cancel or move anytime. It's also the better fit if you want to try professional monitoring without a long commitment. Compare it head-to-head with the other DIY leader in our SimpliSafe vs. Ring guide.
Pick ADT if you want a big, established brand to handle everything for you - professional installation, a proven nationwide monitoring network, and a fully managed system - and a multi-year contract isn't a dealbreaker. It suits larger homes and buyers who prioritize brand reassurance over flexibility.
Still weighing it up? See both against the full field in our 2026 rankings, or get matched free with the right system for your home.
SimpliSafe vs. ADT FAQs
Is SimpliSafe cheaper than ADT?
Yes, in most cases. SimpliSafe has lower up-front equipment costs and no-contract monitoring at roughly $23-$33/month, versus ADT's professionally installed plans which typically run higher and involve a multi-year contract. On comparable professional monitoring, SimpliSafe is often around half ADT's monthly rate.
Does SimpliSafe require a contract like ADT?
No. SimpliSafe is month-to-month with no cancellation fee, and you own the equipment. ADT plans have historically involved a contract of around 36 months - always confirm current terms before signing.
Is ADT better than SimpliSafe?
Neither is universally better. ADT is the stronger pick if you want professional installation and one of the largest established monitoring networks, and don't mind a contract. SimpliSafe is better if you want affordable, contract-free DIY security you can set up and cancel on your own terms.
Can I self-monitor SimpliSafe and ADT?
SimpliSafe can run self-monitored ($0/month) as a local siren with app alerts, though you lose professional dispatch and cellular backup. ADT is built around professional monitoring, so self-monitoring isn't really its model.
Ratings and details reflect our published brand assessments and publicly reported 2026 figures. Verify current plans, pricing and contract terms directly with each provider before you buy.
