This was the first apple from my first-leaf Redlove® Calypso® apple tree. The apple fell off the small tree, so I took that as a signal it was not going to ripen further.
Some precautions -
First year fruits are not always reliable indicators of the future fruits from the same tree. Next year, this tree might have larger, sweeter fruits. Or it might not.
This fruit might not have fully ripened. The tree does have two other fruits. Maybe they will ripen further.
A small tree may not be able to support full ripening.
That said, this small (about silver dollar size) apple was colorful on the inside. The flesh had a crisp, juicy texture. It was not astringent or bitter. What it was, was very tart - like a lemon candy. Or a pineapple, or grapefruit, but crisp.