A quick 2-minute check for parents. Free, and nothing to sign up for.
Most kids start with the thing they want to make: an app, a brand, a game. The ones who actually finish start somewhere else, with a real person and a real problem that person has. This checks whether your kid's idea has both.
1. Who is it for? One real person.
Not "kids" or "gamers." One actual person, with a name and an age. Like "my sister Aisha, 16."
2. What annoying thing does that person deal with?
The best clue that a problem is real: they already have a messy way of coping with it. A sticky note, a list in their phone, a group chat. Something a bit clumsy that they do anyway.
3. Could your kid actually give a first version to that person soon?
4. How often does that annoying thing happen?
5. Could a simple first version be made in about a month of weekends?
If the idea needs logins, accounts, or "an AI" to work, that's a much bigger project. The first version should be small, something your kid could put together in a few weekends.