I keep my GTD through dynalist, I store some important data for me, it would be great if when opening the application, it would be possible to set a pin code that would protect my data, like it is done in banking applications or messengers.
Dynalist will not get any new features. I think you can achieve your goal by forcing to login whenever you open the dynalist.io page, which means tell your browser not to remember the password.
If that doesn’t meet your requirements, I think there are no other options in dynalist.
Some phones allow the user to lock apps behind a pin code What is the Secure Folder and how do I use it? | Samsung UK