| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | — | Yes |
| Plans published | 7 | 7 |
| Spec score · Language learning apps | 8.4 (#76) | 9.3 (#3) |
| Free plan | Yes | Yes |
| Headquarters | Perkasie, Pennsylvania, United States | Poznań, Poland |
| Languages offered | 15 | 25 |
| Mobile apps | Yes | Yes |
| Offline lessons | Yes | Yes |
| Personalized review | Yes | Yes |
| Placement test | Yes | Yes |
| Spaced repetition | Sottaku says its flashcard system uses the FSRS algorithm to optimize review scheduling. | The scheduling algorithm selects individualized review intervals from a learner’s recall results and history. |
| Support | The developer invites questions, comments, and feedback by email or through X. | Technical support is offered through a contact form and support email, with in-course problem reporting available. |
