| Price from | Free | $5,470/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Self-hosted | — | Yes |
| Plans published | 1 | 3 |
| Spec score · Web Annotation Tools | 7.6 (#25) | 8.1 (#10) |
| Intended users | BCU describes eMargin’s use by teachers and students in higher education, further education, secondary schools and language schools worldwide. | The site describes Leafy as a feedback tool for product teams, educators, and researchers. |
| Purpose | eMargin is an online collaborative annotation tool for highlighting, colour-coding, writing notes and tagging words or passages of text. | Leafy lets people annotate, highlight, and comment on live webpages together in real time. |