Snow Leopard is great, and it’s what we use primarily. That means FountainPen has been extensively tested and refined for Snow Leopard. We make sure it works in Leopard, but we don’t have the facilities to push it to the same level of fabulousness. If you would be so kind as to put it through its paces and tell us what needs improvement, we would be extremely grateful. Shoot us an email, software@eightt.us.
If you try and launch FountainPen in Tiger, your computer will give up with a resounding “WTF?” We know this because Naïko has a Cube that will only run Tiger, and wants to use FountainPen on it. We’ll probably cook up a sidestream version that will run on Tiger, but no promises.