OpenSign vs Zoho Sign
OpenSign
opensignlabs.com
Zoho Sign
zoho.comSide by side
| Figure | OpenSign | Zoho Sign |
|---|---|---|
| Price from | $9.99/mo | $10/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 5 | 7 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.6 (#20) |
| Spec score · Digital Signature API Software | 9.0 (#2) | 8.6 (#7) |
| Spec score · Electronic Signature APIs | 8.9 (#2) | 8.6 (#6) |
| Spec score · Electronic Signature Software | 9.0 (#3) | 8.6 (#13) |
| Spec score · E-Signature APIs Software | 9.0 (#3) | 8.6 (#5) |
| Spec score · E-signature tools | 8.9 (#10) | 9.5 (#1) |
| API access | Yes | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | The product can send documents to large recipient lists in one operation. |
| Documentation | The official documentation includes user help, API references, contribution guidance and self-hosting instructions. | The help center provides user, administrator, integration, API and legal guides, FAQs, forums, blogs and webinars. |
| Document templates | Yes | Yes |
| Free plan | Yes | Yes |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | Official integrations include Zoho CRM, Forms, Writer, Desk, People, Recruit, Books, Microsoft 365, Teams, Outlook, OneDrive, Google Workspace, Gmail, Google Drive, Dropbox, Box, HubSpot, Pipedrive, Zapier, Make and Power Automate. |
| Licence | The source code and API documentation identify the project as licensed under GNU AGPL v3.0. | Zoho provides Sign as subscription cloud software under terms that restrict reverse engineering, redistribution and removal of proprietary notices; no open-source licence is stated. |
| Praise: ease of use | Independent reviewers repeatedly describe the interface as intuitive, simple, straightforward and easy to train others on. | G2 reviewers repeatedly describe Sign as fast, simple and easy to use for sending contracts and obtaining signatures. |
| Rating on Capterra | 4.7 out of 5 from 3 reviews. | 4.5 out of 5 from 97 reviews |
| Rating on G2 | 4.6 out of 5 from 12 reviews. | 4.4 out of 5 from 64 reviews |
| Rating on Gartner Peer Insights | Gartner Peer Insights lists OpenSign but shows no reviews yet. | 4.6 out of 5 from 164 ratings |
| Signature order | both | both |
| SMS authentication | Yes | Yes |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
Zoho Sign
- FreeFree
- FreeFree
- API-only Premium$0.50, paid once
- Standard$10 a month
- Professional$16 a month
- Enterprise$22 a month
- CustomPriced 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.