1500 calories a day tends to sit in a much more liveable spot than the more extreme "diet" numbers that get thrown around — for a lot of moderately active adults it's a real deficit (enough to lose weight steadily) without tipping into the kind of number that has you obsessing over the clock until dinner. It's still worth sizing it to you rather than copying it wholesale: someone larger or more active might find 1500 too aggressive, someone smaller and more sedentary might find it barely a deficit at all.
What actually makes 1500 calories work day to day is the same thing that makes any calorie target work: enough protein and enough volume that the number doesn't feel like a number. This planner builds a 1500-calorie plan around your protein target and diet, splits it sensibly across meals, and generates the shopping list alongside it. Set your calories above and just try it — and if 1500 turns out too easy or too hard after a week, nudge it up or down and let the plan rebuild around the new target.