Whitelist vs blocklist: which keeps kids safer on YouTube?

There are two basic ways to control what a child watches. You can list what's not allowed and let everything else through (a blocklist), or list what is allowed and let nothing else through (a whitelist, now often called an allow-list). Most parental controls default to the first. For young children, the second is almost always safer, and this post explains why, and what it honestly costs.

The idea in one sentence#

A blocklist asks "is this video bad?" about everything on YouTube. An allow-list asks "is this channel good?" about the handful of channels your child actually watches.

Why blocklists lose#

Every blocklist has the same problem: it has to keep up with the thing it's blocking.

• The volume is unbounded. YouTube has said that more than 500 hours of video are uploaded every minute. A filter has to make a decision about all of it, in advance, on your child's behalf.
• Blocking is reactive. You usually find out something was unsuitable because your child has already watched it.
• Bad content adapts. Videos that want to reach children can be made to look like the things children love, which is how filters get gamed.
• It's whack-a-mole for you. Blocking one channel does nothing about the next fifty that look like it.

A blocklist can work for older children who mostly know what they're doing. For a five-year-old, it puts the whole burden on a filter that's guessing.

Why allow-lists work#

An allow-list changes the shape of the job. Instead of judging an endless stream, you judge a short list, once, with time to look properly.

• You decide before your child sees anything. You can browse a channel's recent uploads first.
• The list is finite. Ten or twenty channels can be checked properly in an evening.
• There's no route in for anything else. No search, no "up next", no recommendations. What isn't on the list doesn't exist for your child.
• Changing your mind is one click. Remove a channel and it's gone.

The honest costs of an allow-list#

It's not free, and it's better to know that going in.

• Set-up time. You need to choose the channels. Thirty minutes is usually enough to build a good starter list.
• A smaller world. Your child won't stumble on the great new channel by accident. Some children mind; many don't.
• Requests. "Can I watch this one?" will come up. That's a conversation, and it's a healthier one than finding out afterwards.
• Channels change. A channel you approved in March can change tone by September. This is the real weakness of a plain allow-list, and the next section is about it.

Where allow-lists leak, and how to close the gaps#

The trust you place in a channel is a bet on its future output as well as its past. A creator might change direction, start collaborating with people you wouldn't choose, or post something out of character.

The fix is a way to review new uploads rather than trusting a channel for ever. In SafePlay this is called Strict Mode: for a channel you switch it on for, new uploads wait in a review queue until you approve them, while the existing catalogue you already checked stays available. It's most useful for large creators whose content varies, and less necessary for a small educational channel that posts once a month.

The other gap is Shorts, the vertical short-video format that comes with an endless swipe feed. An allow-list that still lets Shorts through has let some of the problem back in. See how to block YouTube Shorts for kids.

Building a good list in thirty minutes#

1. Start with what they already watch. Ask your child to show you their favourites. The list you build is more likely to be used if it includes them.
2. Look at the last ten uploads, not just the channel name. Names and thumbnails say little. Recent videos say a lot.
3. Prefer consistency over popularity. A modest channel that has posted the same kind of thing for years is a safer bet than a viral one.
4. Keep it short at first. Eight well-chosen channels beat eighty half-checked ones. You can always add more.
5. Include variety. A mix of stories, science, art and just-for-fun keeps children happy with a smaller list.
6. Review it every few months. Treat it like a bookshelf, not a contract.

Which should you choose?#

For children under about ten, we'd choose an allow-list, and we're upfront that we make one, so it's fair to ask us to prove it. The test we'd suggest is simple: could you say what your child can see tomorrow? With a blocklist, you can't. With an allow-list, you can.

For older children, a blocklist plus supervision and conversation may be enough, and you might reasonably want a larger allow-list with review of new uploads instead. Our full guide walks through every option by age, and Is YouTube Kids safe? covers the most common one.