Comparison: Chess.com > Lichess > Chess24
That is quick:
| Feature | Chess.com | Lichess | Chess24 |
| Kid security | ChessKid but adults can register | Safe Kid Mode: Avoids all communications (forums, Lichess Indexes,) | None |
| Password | Bigger/smaller (min. 8 characters) | There are a level-safe password-counter (min. 8 characters) | (min 8 characters) |
| Computer | Unlock all with premium, Chess960 and Standard. | Play with stockfish from 1 to 8, all variants. | Only standard |
| Rating | 1200 starting. No limit. | 1500 starting. No limit. | 1500 starting. No limit |
| Anon users | Anonymous users can play 4pc and against bots | Anon users can play with stockfish, view forums, play against bots, play games with users. |
Anon users can play with stockfish and real users |
| Customizable board | Yes | Yes | No |
| Customizable profile | Yes | Yes | Yes |
| Analysis board | Yes (free) | Yes (free) | Only premium (?) |
| Premium | Yes (for unlock all features) | No, free. | Yes (for unlock all features) |
| Custom background | Yes | Yes | No |