Keto is simple to describe and surprisingly easy to get wrong: keep carbs low enough (usually under ~20-50g a day) that your body shifts to running on fat. The mistake most people make isn't willpower, it's not planning — carbs sneak in everywhere (that "healthy" smoothie, the sauce), and one careless day undoes the week.
This planner builds a keto plan inside your carb ceiling and around your calorie and protein targets, so you're not doing carb-maths in your head at every meal. Set the diet to keto and your numbers, and it generates the plan plus a shopping list. Just try it — keto is far easier when the week is decided in advance.