You could just use the favorite system on dododex as an improvised checklist

I have created an excel file that is a list of all tamable dinos. Once you tame one just check the box next to it and it will cross it off the list and tell you the percentage of all dinos you have tamed. I am working on linking the dino names to their dododex reference page. I am willing to give this to Dododex but if they do not want it I will be making it available for free download.

This! Something along the lines of what is already on the app, under 3rd party “Ark Buddy” but I want to be able to put in base stats from the tame similar style to the stat calculator. Maybe even a photo of the tame. I’m newer to ark and want to get into breeding but what I understand is that the base stats is what matters, but I want to be able to track my tames and their stats while still being able to level them up.

Yes

Ya!

Possibly the same feature: https://dododex.canny.io/feature-requests/p/custom-creature-categories