Do I need a subscription to use my Yummly® Smart Thermometer? May 18, 2021 21:34 Updated No. The Yummly app is free to download, and you can use the thermometer controls in the app without a paid subscription. Related articles What's included in my Yummly subscription? Is the Yummly® app free? Why is subscription not available in my region? What's so special about Yummly's subscriber-only recipes? Does my subscription include a Yummly® Smart Thermometer?