Shop by price · Updated for 2026

Best Smart Door and Window Sensors Under $40

All the smart door and window sensors in our catalog priced under $40, ranked best first, with live prices, real owner ratings and full specs so you can compare before you buy.

Last updated

As an Amazon Associate I earn from qualifying purchasesIndependent · Not sponsored
22
Products
13
Brands
$12.90
Prices from
30%
Top discount

Ring Window and Door Contact Sensor (2nd gen) is the top pick among smart door and window sensors under $40, rated 4.7 stars across 29,608 customer reviews.

22 products

No products match these filters.

FAQ

Frequently asked questions

What are the best smart door and window sensors under $40?

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 $40, ordered by customer rating weighted by how many reviews back it. The full list compares 22 products in this price range.

How many smart door and window sensors cost less than $40?

This page tracks 22 smart door and window sensors under $40 from 13 brands, with prices starting at $12.90.

Are these prices up to date?

Prices are re-checked continuously, so every card shows the latest price we have. A product whose price rises above $40 drops off this list on the next update.

Looking for more than $40?

See all the door & window sensors in the catalog, compared side by side on specs, price and rating.

Browse all Door & Window Sensors
Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.

As an Amazon Associate I earn from qualifying purchases.

CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.

© 2026 Smart Home Compared
Search