Enlarge / The SmartDry laundry sensor was widely regarded as a useful smart home gadget that saved money and time. When its owners' servers go dark at the end of September, users face a useless device or a notable DIY journey. (credit: Getty Images)

SmartDry was a smart home product that did something useful: tell you when your clothes in your dryer were actually dry.

A small pack mounted inside nearly any dryer drum could prevent clothes from shrinking, save you energy costs (at least $60 per year, the marketing claimed), and even warn you about clogged vents causing high heat—or, much worse, gas buildup. A second-generation version could even turn off your gas dryer automatically. Reviewers greatly preferred it to their own dryers' unpredictable dryness sensors.

The problem is that SmartDry alerted you to dry clothing by connecting to your home's Wi-Fi; the device sent a message to parent company Connected Life's servers and then relayed that message to your smartphone. But Connected Life Labs is closing, discontinuing SmartDry, and shutting down its servers on September 30. After that, "cloud services will cease operations and the product apps will no longer be supported."