OpenSign vs RabbitSign
OpenSign
opensignlabs.comRabbitSign
rabbitsign.comSide by side
| Figure | OpenSign | RabbitSign |
|---|---|---|
| Price from | $9.99/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 5 | 6 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.3 (#28) |
| Spec score · E-signature tools | 8.9 (#10) | 8.3 (#26) |
| API access | Yes | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | Yes |
| Document templates | Yes | Yes |
| Free plan | Yes | Yes |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | RabbitSign says Zapier, Salesforce, and HubSpot integrations are under development. |
| Intended users | The documentation describes the product as designed for individuals and businesses, from startups to large corporations. | RabbitSign says its free HIPAA-compliant e-signing is offered to HIPAA Covered Entities and Business Associates. |
| Product | OpenSign describes itself as an open-source PDF e-signature solution for signing, storing, and securing documents. | RabbitSign provides electronic signature requests for signing documents. |
| Security | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. | RabbitSign states that it has SOC 2 Type II compliance with an unqualified opinion and ISO 27001:2022 compliance. |
| Support | The documentation directs users to contact OpenSign support at [email protected] for assistance. | RabbitSign offers email support at [email protected]. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
RabbitSign
- Free manual e-signingFree
- Developer API folder creation$0.10, paid once
- Developer API non-folder calls$1, paid once
- Manual e-signingFree
- Batch Send$0.03, paid once
- Developer API$0.10, paid once
In their own words
OpenSign
OpenSign is an open-source PDF e-signature solution for signing, storing, and securing documents. Users can create reusable templates with pre-placed widgets and send them through the API to one or many signers. API workflows include self-signing, drafts, signer roles, public template links, and real-time webhook notifications. Templates can be embedded in React, Next.js, HTML, JavaScript, and Angular projects. The documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs; account protection includes two-factor authentication and passkey sign-in. The free plan costs nothing and lists unlimited digital signatures and templates, completion certificates, sequential signing, OpenSign Drive, and email notifications. Its free-plan guide limits invitation emails to 15 per month; bulk sending and public links require a paid plan. Live API tokens require Professional or Teams, though sandbox tokens are available on all plans. OpenSign provides Docker self-hosting instructions for Linux, macOS, and Windows. Some SMTP features are limited to paid plans.
RabbitSign
RabbitSign has no write-up on Specifiction yet; its figures are above.