Search for a low-carb grocery list and most tools want to sell you a rigid "keto" mode with a fixed macro split, as if everyone going low-carb wants the same 20g-a-day ceiling. This builder does it differently: there's no keto or low-carb diet preset to select, because low-carb isn't really a diet type, it's a macro choice. You dial the carb target down on the slider, and the protein and fat targets pick up the slack.
Set carbs low and the free basket rebuilds itself around meat, fish, eggs, dairy, non-starchy veg and fats, dropping the rice, bread and potatoes that would blow the target, without you having to hunt them down and remove them by hand. That's arguably more honest than a fixed preset anyway — 50g of carbs a day and 150g are both "low-carb", and only a slider actually tells the difference. Pick a base diet if you've got one (omnivore, pescatarian, vegetarian and vegan all work here), then pull the carb target down and let protein and fat fill in around it. Just try it — drop the carb slider and watch the basket change.