You set the start and end of a range (say, 1 to 100), how many numbers you want generated, and Rifael picks them at random with no repeats. If the range is smaller than the quantity you're asking for, it warns you before generating anything, so you never end up with an incomplete result.
It's the natural tool for raffles based on a ticket number, physical tombolas where numbers were already handed out in person, private lotteries among friends, or any draw where the prize is tied to a number rather than a name.
It can also be scheduled to run at a specific date and time, with a shareable link so anyone can watch the result live, countdown included.
Can the same number come up twice?
No, within the same draw every generated number is unique — if you ask for 5 numbers between 1 and 10, you'll get 5 different numbers.
Is there a limit on the range size?
Yes, for performance reasons the range can't exceed one million numbers — more than enough for any real draw.
Can it replace a physical lottery drum?
Yes, it's the exact same principle: a random number within a range, with no bias and no repeats.