Is there a vegan butter substitute that does not contain saturated fat, or any oils for that matter?

Nope.

Even avocados contain fat, but they're considered healthy fats, & in moderation are very good for you.

They help lower your LDL (bad) cholesterol.

Nut butters are similar & high fibre too.

Look for unsweetened organic versions.

Cat manure should do.

Butter is fat, vegan butter is oil.

Although it is mostly saturated, coconut based vegan butters do not seem to cause the same health effects as other saturated fats. The only fat free butter I know of is apple butter.

Neko no kuso

There's no such thing as fat free butter. And, to the best of my knowledge, there's no such thing as vegan butter. Butter is made with cream (which comes from cow's milk) and salt. Margarine is made mostly from hydrogenated vegetable fats, but has other ingredients that contain animal products. I'm talking about milk products.

Butter and margarine have fat in them. And neither of them are vegan (they both are either made from milk products, or have milk products added to them).

For the record: I'm not a vegan.

Spectrum makes a began spread. All such products are firm due to emulsified fats and stabilizers. Read labels. The more specific the product, the greater the expense. Spectrum is at the health food store and whole foods.

As close as you can come is probably Tapioca starch.

sweetie, even vegan, its going to contain some kind of fat or it won't be a butter of any kind.

Avocado is used in many countries as a spread for bread. Depends on how you want to use it.

Maybe sunflower butter.