OpenSign vs sproof sign
OpenSign
opensignlabs.com
sproof sign
sproof.comSide by side
| Figure | OpenSign | sproof sign |
|---|---|---|
| Price from | $9.99/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 5 | 5 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.0 (#41) |
| Spec score · Electronic Signature Software | 9.0 (#3) | 8.0 (#21) |
| Spec score · E-signature tools | 8.9 (#10) | 8.2 (#31) |
| API | OpenSign exposes a REST API authenticated with an x-api-token header and provides sandbox, production and EU endpoints. | The Enterprise plan includes API access for automating signature workflows. |
| API access | Yes | Yes |
| Audit trail | Yes | Completed workflows provide participants with the signed document and a tamper-proof audit trail. |
| Bulk sending | Yes | Yes |
| Free plan | Yes | Yes |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | Its integrations include Microsoft SharePoint, Word, Teams, Google Drive, Zapier, Make, DATEV, DocuWare, and Personio. |
| Support | The documentation directs users to contact OpenSign support at [email protected] for assistance. | The Enterprise plan includes premium support with a direct personal point of contact. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
sproof sign
- Private PlanPrice not published
- Single€15 a month
- Team€170 a month
- PrivateFree
- EnterprisePriced on request
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.
sproof sign
sproof sign provides electronic signatures and digital approval workflows for contracts through the web and an API. Users upload documents, place signature fields, set a sequential signing order, and send invitations; recipients can sign from email without registering. The service supports simple, advanced, and qualified electronic signatures, with identity verification, bulk sending, audit trails, and workflow templates. Teams can share work, assign roles, and give assistants access for document preparation. Connections include Microsoft SharePoint, Word, Teams, Google Drive, Zapier, Make, DATEV, DocuWare, and Personio. Enterprise adds API access, embedded signatures and identity checks, single sign-on, custom branding and domains, and premium support with a personal contact. sproof says it is ISO 27001 certified, GDPR- and eIDAS-compliant, and developed and hosted in Europe. A free Private plan supports PDF signing. Single costs €15 a month with annual billing, while Team costs €170 a month with annual billing, excluding VAT.