Ring Window and Door Contact Sensor (2nd gen) is the top pick among smart door and window sensors under $30, rated 4.7 stars across 29,450 customer reviews.
RingWindow and Door Contact Sensor (2nd gen)
4.7(29,450)25% OFF$19.99$14.99
EufyEntry Sensor
4.6(2,016)$29.99
AqaraDoor and Window Sensor
4.4(6,095)10% OFF$17.99$16.19
YoLinkLoRa Smart Outdoor Contact Sensor
4.5(1,003)$24.99
SwitchBotContact Sensor
4.3(1,165)$16.99
SonoffDW2-WIFI
3.8(1,059)$12.23
AqaraDoor and Window Sensor P2
3.6(1,102)7% OFF$29.99$27.99
HeimanWindow Door Alarm
4.0(148)$19.98- Price alerts
Door & Window Sensors under $30, updated as prices fall
We check the price of every Door & Window Sensor in the catalog daily, and email you the ones that drop into this range.
ArloAll-in-One Sensor
4.1(94)7% OFF$29.99$27.90
SonoffSNZB-04 ZigBee Wireless Door/Window Sensor
3.8(102)$17.99
MerossSmart Door and Window Sensor
3.0(36)18% OFF$21.99$17.99
SonoffSNZB-04P ZigBee Door/Window Sensor
3.9(12)$18.99
ArreTuo Contact Sensor
2.8(12)$29.99
ShellyBLU Door/Window ZB
$22.99
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Frequently asked questions
What are the best smart door and window sensors under $30?
Ring Window and Door Contact Sensor (2nd gen), Eufy Entry Sensor and Aqara Door and Window Sensor lead our ranking of smart door and window sensors under $30, ordered by customer rating weighted by how many reviews back it. The full list compares 14 products in this price range.
How many smart door and window sensors cost less than $30?
This page tracks 14 smart door and window sensors under $30 from 11 brands, with prices starting at $12.23.
Are these prices up to date?
Prices come from each product's Amazon listing and are re-checked continuously, so every card shows the latest price we have. A product whose price rises above $30 drops off this list on the next update.
Looking for more than $30?
See all the door & window sensors in the catalog, compared side by side on specs, price and rating.