BibSonomy vs Wren
| BibSonomy | Wren | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | Free | Free |
| Open source | No | No |
| Platforms | api, Web | api, extension, macOS |
| Free plan | Yes | Yes |
| PDF annotation | — | Yes |
| Browser capture | — | Yes |
Both are listed in Best Reference Management Software. On Freedom251, BibSonomy scores higher on our published basis.