I have a lot of varieties of red fleshed cider and eating apples. They all have tannins and many have tannic skins and I'm speaking mostly of red leaved red fleshed Type one Hansen type like Redfield, Otterson (haven't tried this one yet), Geneva, Niedz. These are tannic and acid bombs but that will also depend on where they are grown as I have heard of a lot of variation as with other apples. Type Ones tend to be more primitive in flavour and have more tannin, acid and bittering (some varieties) components which is great for cider but are harder for sure to make a single varietal. They can be weak in the middle or harsh at the end ect so blending is your best best. They add a nice pomegrante, cranberry, rasberry, red berry and sometimes soft strawberry to a blend which rounds out to be a jolly rancher type experience. Red fleshed are a great acid component if you have a lot of bittersweets planted.
I'm in Pacific northwest and Airlie Redflesh/Mountain Rose/Hidden Rose (all same apple) doesn't have much tannin but has over the top acid for me. Those that are grown in hotter areas will naturally have less acid but perhaps less colour. It's also a very late apple and ripening it in short season climate is a futile battle for some. Don't pick them underripe - been there done that and not worth the effort there. The Type Two red fleshed Etter type apples with green leaves and green inner wood can have tannins too but they are a lot more approachable and dare I say refined. More suited to eating or eating for those looking for a unique experience. I also think that the closer an apple gets to becoming a grocery store apple, the less flavour we get in the cider.
I should also note that type one red flesh has more tannin but if you use them in a pie, those tannins settle with cooking and they are delish in pies and cumbles!