Spelt is quite a high-carb flour, so it’s not the best choice for a keto diet.
The best low-carb, keto-friendly flours are almond flour, soy flour, coconut flour, and flaxseed meal.
None of these flour types feature on our list, but that doesn’t mean you necessarily can’t substitute them for spelt flour. You may have to do some research and experimentation in terms of conversion ratios and flavor, however.
Coconut and almond flour already have the sweet nuttiness of spelt flour taken care of, though, so that’s one less thing to worry about!