Whoa, sorry about the super late reply! I'd kind of left it alone for awhile. Good news is I've been able to dedicate some time lately and have completely revamped the application. Like you, I didn't find anything out there that occupies the middle ground between a simple die-roller and a full out on-line (expensive) gaming tool.
I'm still working on the new version (https://my.blacklich.com), but it is already working (on chrome browser only) and I've play tested it several gaming sessions. I completely needed the ability to add/modify a monster, so you will find that already available. This required supporting users, so I've added that too. This way you have your own list of monsters. To do:
• general improvements (bug fixes, etc. Will never end :)
• sharing (you will be able to create a monster and enable sharing)
• roll log
• performance improvements
• make compatible with non-chrome browsers (Firefox, Safari, Edge)
I super appreciate the warm reception! Frankly I'm ashamed that I didn't respond to you sooner. Thank you for the enthusiasm. I'm committing to posting updates. I fully welcome and would appreciate feedback and ideas!
Yours in D&D!