Gimdow claims that its new smart lock is one that doesn't require the user to replace the existing one (or even parts of it). This may be ideal for those who want this kind of Bluetooth-enabled security, but can't risk damage to fittings while installing it. The new product has just launched as part of a crowdfunding campaign.
https://www.notebookcheck.net/The-new-Gimdow-smart-lock-does-not-require-a-door-teardown-to-install-it.447055.0.html