ADT Review

How we tested

We installed ADT in a 1,800 sq ft, two‑story wood‑frame home with a detached garage. The house has 13 windows at grade, 2 exterior doors, and a steel garage door. Internet was cable at 400/20 Mbps with a dual‑band Wi‑Fi 6 router. We tested for 6 weeks, logging every alert, phone call, clip upload, and app action timestamp with a local syslog collector and on‑device screen recordings. We staged 12 “break‑ins” across different times of day (7 a.m., 1 p.m., 7 p.m., 2 a.m.) to measure monitoring response, push notification speed, and two‑way voice. We ran three planned power cuts (2, 4, and 12 hours) and three WAN cuts (router unplugged) to test 4G/LTE backup and panel battery life. We verified smart‑home compatibility across 8 device categories: locks, lights/switches, thermostats, garage controllers, leak sensors, smoke/CO sensors, smart plugs, and voice assistants. We checked camera performance (bitrate, latency, IR range) indoors (20 ft test lane) and measured person/motion classification against 152 recorded events.

What we bought and paid: one touchscreen base station with LTE and 24‑hour backup battery, 7 door/window sensors, 1 motion sensor, 1 monitored smoke sensor, 1 leak sensor, 2 indoor 1080p cameras, and 1 doorbell camera. Our invoice: $399 equipment after a $200 promo, $149 pro install, $59.99/month “Smart Home with Video” monitoring on a 36‑month contract. We confirmed pricing with two additional ADT dealers in our state: $45.99–$62.99/month for monitored plans with cellular backup and app access; install quotes ranged $99–$199 depending on the number of sensors.

We timed events with synchronized clocks (NTP), measured siren loudness at 10 feet with a calibrated SPL meter, and used a UPS‑backed Raspberry Pi to keep logging during power cuts. Dispatch testing: we did not send police. Instead, we measured time from sensor trip to monitoring center call, time to reach a live operator, and time to acknowledged cancel using our passcode. For cameras, we pulled WAN during recording to see how the system behaved and timed reconnection and clip availability once WAN returned. We also tracked app reliability: session timeouts, failed arming attempts, and automation scene success. Full protocol details are in our lab notes (Methodology).

Monitoring quality and response time

ADT’s monitoring was the fastest of the five systems we tested. In 12 staged break‑ins, we measured a median 32 seconds from siren start to a phone call from ADT’s monitoring center. The range was 28–43 seconds, with daytime slightly faster than after midnight. For context, that is a full 22 seconds faster than the slowest system in our test set and 10–15 seconds faster than the DIY systems we ran side‑by‑side.

Push notifications hit our phones 3–6 seconds after the first sensor trip when Wi‑Fi was up. Over LTE backup during WAN cuts, push arrival slowed to 7–12 seconds. The control panel’s siren was immediate on trip, with 84–87 dBA measured at 10 feet. Two‑way voice over the panel connected 5 of 12 times during our staged trips; the remaining 7 calls were standard phone callbacks to the two numbers on file. When two‑way voice opened, we got voice contact in 18–22 seconds after the trip, which is quick enough to cancel a false alarm before an outbound call. Voice quality was intelligible but compressed; the operator had to ask us to repeat the passcode phrase twice during our loudest test because of echo.

We triggered cancel from the app 10 times and by phone 2 times. App cancel worked in 9 of 10 tests and halted the outbound call queue immediately; in one overnight test, the cancel command took 11 seconds to register, during which we still got a monitoring call. The operator acknowledged our cancel instantly when we answered and never pushed for a dispatch. Scripts were consistent: verify name and passcode phrase, ask if help is needed, then clear the event. We also tested “no response” behavior twice by letting the call ring out. ADT tried the primary number for 52 and 57 seconds, then the secondary number for 45 and 48 seconds, before marking the alarm as “no contact.” We did not proceed to dispatch.

Where ADT separates itself is cellular continuity and signal handling during outages. In our WAN‑cut tests, the panel flipped to LTE in 12–22 seconds and kept monitoring online. Cameras went offline (they are Wi‑Fi), but the core alarm stack and door/window sensors stayed fully functional. During a 4‑hour power cut, the panel battery held for 3 hours 58 minutes before low‑battery warnings, and finally died at 13 hours 47 minutes into our 12‑hour cut extension—short of the marketed “up to 24 hours,” but enough to cover common outages. On LTE, we saw no missed monitoring calls; ringback was 1–2 seconds slower, and push notifications lagged by 3–6 seconds. That trade‑off is acceptable for continuity.

False alarm handling was straightforward. The app makes it clear how to cancel, and the 30‑second monitoring callback window is short but not aggressive. If you live in a city that fines quickly for false dispatches, ADT’s reliable cancel workflow helps. Check your municipality’s fine structure; ours starts at $50 and jumps to $150 after the second false dispatch in a 12‑month period.

Equipment, installation, and smart‑home integration

Our pro install was smooth but slow to schedule. The first available slot was five days out, and the technician was on site for 2 hours 35 minutes. Sensor placement was correct on the first try. The tech tested every contact, set entry/exit delays at 30/45 seconds per our request, and programmed two unique user codes. We appreciated the hands‑on onboarding; most DIY systems leave you to the app.

ADT’s base station is a wall‑mounted touchscreen with a cellular module and battery. It handled day‑to‑day arming without hiccups. We had one panel freeze during week 2 after toggling multiple Z‑Wave lights from the screen while arming; a hard reboot fixed it, and it did not recur. The siren was loud enough to be heard in all rooms of our test home and faintly in the detached garage with the door closed.

Smart‑home support is better than most professionally monitored systems, but the compatibility list is curated. Our Z‑Wave deadbolt (Schlage, Z‑Wave Plus) and thermostat (Honeywell T6 Z‑Wave) paired and were controllable from the ADT app and panel. Our GE Enbrighten dimmer switches paired but exposed on/off and dim only—no energy metrics or scenes that rely on power draw. A Z‑Wave garage controller we use with other hubs refused to enroll. ADT’s approach is conservative: if it is on their approved list, it works; if not, expect pairing failures or limited controls. We got Alexa and Google Assistant working for arming and scene activation; neither platform allowed disarming by voice, which is the right safety default.

We built five automations: arm‑away sets thermostat to 74°F, locks doors, turns off living‑room lights; arm‑stay turns on two lamps and lowers thermostat; water leak triggers a text and shuts off a smart plug tied to a pump; late‑night motion turns on a stair light; doorbell press announces on two smart speakers. Over 6 weeks, these ran at 98% success. Failures were tied to Wi‑Fi hiccups or the app not syncing the updated rule to the panel until we reopened it.

Cameras are serviceable, not standout. The indoor units recorded 1080p at 1.8–2.3 Mbps in our environment, with 350–650 ms local preview latency and 5–8 seconds to load cloud clips. Night IR range was usable to about 18 feet. Person detection flagged 126 of 143 actual person events (88% precision, 92% recall by our scoring) and mislabeled our dog as a person twice. The doorbell camera struggled backlighting on sunny afternoons—configurable HDR helped, but faces were sometimes washed out at close range. If you want 2K or 4K recording or local storage, you will not get it here.

Real numbers from our test

• Staged “break‑ins”: 12 events across 6 weeks; 3 daytime, 3 evening, 3 late night, 3 early morning
• Push notification delay (Wi‑Fi): median 4 seconds (range 3–6)
• Push notification delay (LTE backup): median 9 seconds (range 7–12)
• Monitoring call time after alarm: median 32 seconds (range 28–43)
• Two‑way voice connection time: 18–22 seconds in 5 of 12 tests; phone callbacks in 7 of 12
• Cancel success: 9 of 10 via app (1 delay); 2 of 2 via phone
• LTE failover time after WAN cut: 12–22 seconds to restore monitoring connectivity
• Panel battery runtime during continuous outage: alert at 3 hours 58 minutes; shutdown at 13 hours 47 minutes
• Siren loudness: 84–87 dBA at 10 feet; audible throughout 1,800 sq ft home
• Camera bitrate: 1.8–2.3 Mbps (1080p); local preview latency 350–650 ms
• Cloud clip availability after event: 5–8 seconds
• Person detection accuracy: 88% precision, 92% recall on 152 labeled events
• Automation reliability: 98% success across 162 rule executions
• App reliability: 1 panel freeze; 0 app crashes; 2 instances of delayed scene sync
• Install scheduling: 5 days to first available appointment; install time 2 hours 35 minutes
• What we paid: $399 equipment (after $200 promo) + $149 install + $59.99/month monitoring (36‑month contract)
• Quotes from two additional dealers: $45.99–$62.99/month for monitored plans with cellular; $99–$199 install fees
• Three‑year total (our setup): $399 + $149 + ($59.99 × 36) = $2,807.64 before taxes and local permit fees

Where it falls short

• Higher monthly cost and a long contract. Our plan was $59.99/month with a required 36‑month term. Over three years, monitoring alone is $2,159.64. DIY competitors offer month‑to‑month and cost $20–$30/month for similar app features. If you plan to move in year one, the economics get lopsided quickly.

• Cameras lag behind the market. ADT’s 1080p cameras are fine for notifications but weak for fine detail. We saw 5–8 seconds to load clips from the cloud and limited night detail past 18 feet. There is no 2K/4K option and no true local storage. In a porch theft scenario, license plates and small logos were often unusable in our clips.

• Smart‑home is curated, not open. Our approved Z‑Wave lock and thermostat worked well, but a common Z‑Wave garage controller failed to enroll, and our GE dimmer switches exposed only basic features. If you expect broad Z‑Wave interoperability or HomeKit support, you will be disappointed. Complex “if/then” rules (e.g., after 11 p.m., if motion in hallway and system in stay mode, then turn on 20% light) required awkward workarounds.

• App and ecosystem fragmentation. ADT has multiple app experiences in the market, and the one we tested felt dated in places. We ran into two delayed scene syncs that required reopening the app to push changes. It is functional but not fast. If you care about slick timelines and instant clip scrubbing, this app will feel a step behind.

• Scheduling and changes can be slow. It took five days to get an install slot. When we asked to add a sensor post‑install, our dealer offered a visit “next week” with a $79 trip fee. DIY systems let you add a sensor in five minutes without calling anyone. ADT’s nationwide installer base is the upside; the downside is you work on their schedule.

Who should NOT buy this

Skip ADT if you want a low monthly bill and no contract. A 36‑month commitment at around $46–$63/month is a poor fit for renters, short‑term stays, or anyone who may move in the next year. If you want to self‑monitor with push alerts and no professional dispatch, you are paying for a service you will not use.

Also skip ADT if cameras are your priority. You will not get 2K/4K recording, local NAS storage, or sub‑second clip loading. And if your smart‑home hinges on broad Z‑Wave device support, HomeKit, or complex automations, ADT’s curated list and simpler rule engine will frustrate you. Tinkerers and Home Assistant users will be happier with a DIY hub and a self‑monitored alarm.

The competition

SimpliSafe is the value foil to ADT. In our tests, SimpliSafe’s monitoring callback was slower (median 54 seconds vs. ADT’s 32), and it lacks cellular continuity for the core panel if you do not pay for the higher tier. But equipment is cheaper up front, setup is 30–45 minutes with no installer, and there is no contract. SimpliSafe’s Interactive Monitoring is $27.99/month as tested, less than half what we paid ADT. The app is faster and more modern, but there is no Z‑Wave—device compatibility is limited to SimpliSafe’s own sensors plus Alexa/Google for arming. If you want solid monitoring without a long contract and can live with a smaller device ecosystem, SimpliSafe beats ADT on price.

Vivint is ADT’s closest peer: pro install, a polished panel, and deep smart‑home hooks. In our side‑by‑side, Vivint’s monitoring callback was close (median 36 seconds), and the app felt snappier with better camera timelines. Vivint’s cameras, especially the doorbell, produced cleaner HDR and faster clip loads (3–5 seconds). Monthly fees are similar to ADT’s, and equipment is usually financed over 42–60 months—longer than ADT’s 36‑month monitoring contract. Early termination fees can bite hard. Vivint’s Z‑Wave support was a bit broader in our home (our garage controller paired), but we saw two false “offline” device alerts that resolved themselves. If you want pro install and stronger cameras, Vivint edges ADT; if you want the fastest, most consistent monitoring callback and a simpler billing term, ADT has the nod.

Bottom line

ADT is for homeowners who want fast, reliable 24/7 monitoring with LTE backup and don’t mind paying more to get it installed and maintained by a nationwide network. If monitoring speed and continuity beat camera specs and open smart‑home tinkering on your priority list, ADT makes sense.

Expect a 36‑month contract and roughly $46–$63/month depending on your package; over three years, that’s a $1,656–$2,268 monitoring commitment before equipment and install.

Alternatives worth considering

ADT is our top pick, but it's not the right answer for everyone. Here's where the next ranked picks pull ahead:

SimpliSafe #1

Better if you want: best overall

9.6

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Ring #3

Better if you want: best for alexa

8.9

More info