| Price from | Free | $1.67/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 5 |
| Spec score · Forum Software | 7.5 (#13) | 7.9 (#8) |
| Customization | Community-built extensions can add features, and styles can customize a board’s appearance. | Forum owners can choose from a theme library and add user-submitted plugins from a plugin library. |
| Founded | 2000 | 2000 |
| Purpose | phpBB is an open-source bulletin board system for building online forums. | ProBoards provides hosted internet forums where visitors can discuss topics through posted messages. |
| Support | Support resources include documentation, knowledge base articles, community support forums, and limited-support Discord and IRC chats. | ProBoards advertises 24/7 support through its member support forum and help guide. |