OpenSign vs SigniFlow
OpenSign
opensignlabs.comSigniFlow
signiflow.comSide by side
| Figure | OpenSign | SigniFlow |
|---|---|---|
| Price from | $9.99/mo | $15/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 5 | 20 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.8 (#10) |
| Spec score · E-signature tools | 8.9 (#10) | 8.9 (#9) |
| API | OpenSign exposes a REST API authenticated with an x-api-token header and provides sandbox, production and EU endpoints. | SigniFlow offers a developer-facing OpenAPI for creating, signing and managing documents and automating processes. |
| API access | Yes | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | Yes |
| Document templates | Yes | Yes |
| Free plan | Yes | Yes |
| Identity verification | OpenSign documents can require email OTP verification and access codes before recipients view or sign. | SigniFlow offers eKYC/AML checks, electronic identity verification and 3D facial liveness with photo-ID matching. |
| Licence | The source code and API documentation identify the project as licensed under GNU AGPL v3.0. | SigniFlow is presented as privately held commercial software under a vendor EULA; no open-source licence is provided. |
| Praise: ease of use | Independent reviewers repeatedly describe the interface as intuitive, simple, straightforward and easy to train others on. | Reviewers repeatedly describe setup, sending and signing as intuitive and easy for administrators and recipients. |
| Rating on Capterra | 4.7 out of 5 from 3 reviews. | 4.5 out of 5 from 87 reviews |
| Rating on Gartner Peer Insights | Gartner Peer Insights lists OpenSign but shows no reviews yet. | 4.8 out of 5 from 7 reviews |
| Rating on GetApp | 4.7 out of 5 from 3 reviews. | 4.5 out of 5 from 87 reviews |
| Rating on Trustpilot | 3.6 out of 5 from 4 reviews. | 4 out of 5 from 4 reviews |
| Self-hosting | OpenSign can be deployed with Docker on Linux, macOS or Windows using Docker Compose, MongoDB and S3-compatible or local storage. | Private Tenant licenses can run on-premises or in a customer-selected public or private cloud data centre. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
SigniFlow
- Business Cloud$15 a month
- Nano-50Priced on request
- Nano-50Price not published
- Micro-100Priced on request
- Micro-100Price not published
- Mega-250Priced on request
- Mega-250Price not published
- Terra-500Price not published
- Terra-500Priced on request
- Peta-1000Priced 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.