If sold to a "Bryan" out there, I wouldn't rule out a 4 figure offer. Plenty Bryans out there, holding a good amount of popularity. As for "customized", again I'd see it as an easy 4 figure range domain, depending on buyer. Very nice @devma
Customized.io is valueless. Same word in a lot better extensions.
Bryan.io is ok. One of the most popular first, proper names in English. Did you buy it only because a one word was available or did you have a plan for it?
I would say both domains are 3 figures easily, you can possibly get more with the right buyer… I like customized more and can find a lot of use cases for it (eg. website style customization browser extension).
Both are good domains, can be sold xxxx or more to right end user. But finding end user is a challenge. You must be patient, or consider to use brokerage like GritBrokerage.com. Bryan.io seems more valuable