Level Bolt is a HomeKit-enabled smart lock that works with existing deadbolts
Apple Begins Selling Danalock V3, First Retrofit HomeKit-Enabled Smart Lock Available in Europe - MacRumors
Level Bolt Smart Lock - Smart Deadbolt that Works with Your Existing Lock for Keyless Lock Entry, App-Enabled Bluetooth Lock with Smartphone Access, Compatible with Apple HomeKit - Amazon.com
Level Lock Review: The Invisible HomeKit Smart Lock - YouTube
These best HomeKit door locks you can buy
Apple HomeKit / Home Key Compatible Locks | by Ishara Fernando | Medium | Dev Genius
FL1 Fingerprint Lock
Xiaomi Adds Smart Lock Pro to HomeKit Lineup [U] - Homekit News and Reviews
Aqara HL Smart Door Lock - Homekit News and Reviews
Level Touch: A HomeKit-Enabled Smart Lock That Everyone in Your Household Can Appreciate - MacStories