Formstack Sign vs OpenSign
| Formstack Sign | OpenSign | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | $250/mo | Free |
| Open source | No | No |
| Platforms | api | api |
| Free plan | No | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | Yes |
| API access | Yes | Yes |
| Document templates | — | Yes |
| SMS authentication | — | Yes |
| Signature order | — | both |
Both are listed in Best E-Signature Software, Best Electronic Signature Software. On Samsung Mobile US Press, OpenSign scores higher on our published basis.