| Price from | $8.99/mo | $5/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | — | Yes |
| macOS | Yes | — |
| iOS | Yes | Yes |
| Android | Yes | — |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 5 | 4 |
| Spec score · Language Immersion Apps | 8.0 (#10) | 9.1 (#1) |
| Integrations | Gravity’s privacy policy names Google sign-in, AI services from OpenAI and Google Cloud AI, and billing through Apple, Google Play, RevenueCat, or Stripe. | The documentation lists AnkiConnect, Claude or OpenAI-compatible AI servers, optional Google Cloud Text-to-Speech, and Docker. |
| Product | Gravity turns Japanese videos, music, podcasts, and captured text into personalized language-learning material. | Lector is an open-source language-learning reader for learning through imported texts and media. |
| Support | The maker directs users to email [email protected] for questions and feedback. | The contact page offers email replies, Discord live chat, and GitHub issues for bugs. |
