OpenSign vs Sign.Plus
OpenSign
opensignlabs.comSign.Plus
sign.plusSide by side
| Figure | OpenSign | Sign.Plus |
|---|---|---|
| Price from | $9.99/mo | $9.99/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 | — |
| Plans published | 5 | 13 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.5 (#22) |
| Spec score · E-signature tools | 8.9 (#10) | 8.7 (#14) |
| API access | Yes | Yes |
| Audit trail | Yes | Tamper-proof audit logs capture activity including names, IP addresses, and devices. |
| 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. | The service lists Google Workspace, Microsoft Word, Zapier, and an eSignature API integrations. |
| Intended users | The documentation describes the product as designed for individuals and businesses, from startups to large corporations. | The product is presented for individuals, sole proprietors, small and medium businesses, and enterprises. |
| Security | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. | Sign.Plus says signed files use 256-bit AES encryption with unique encryption keys per user, and supports TLS 1.3. |
| Signature order | both | both |
| SMS authentication | Yes | Yes |
| Templates | Users can create reusable templates with pre-placed widgets and send them to one or many signers through the API. | Users can create reusable templates with fillable fields and dynamic variables. |
| What it does | OpenSign provides cloud and self-hosted electronic document signing for creating, sending, signing, storing and tracking documents. | Sign.Plus is a cloud-based electronic signature service for signing, sending, tracking, and managing agreements and contracts. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
Sign.Plus
- FreeFree
- Personal$9.99 a month
- PersonalPriced on request
- ProfessionalPriced on request
- Business$29.99 a month
- BusinessPriced on request
- Enterprise$49.99 a month
- EnterprisePriced on request
- FreeFree
- Personal$9.99 a month
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.
Sign.Plus
Sign.Plus is a cloud-based service for signing, sending, tracking, and managing agreements and contracts. Documents can be sent for remote or in-person signing, with signer order and steps configured and real-time notifications available. Reusable templates support fillable fields and dynamic variables, and bulk sending is available. Listed integrations include Google Workspace, Microsoft Word, Zapier, and an eSignature API. For document storage, it connects with Google Drive, iCloud Drive, Dropbox, Box, and OneDrive. Sign.Plus says it supports ESIGN, eIDAS, and ZertES, including Qualified Electronic Signatures. Its security description lists 256-bit AES encryption for signed files and TLS 1.3. The service is offered on Android, iOS, web, as an extension, and through an API. The Free plan includes three signature requests total and one template. Personal costs $9.99 a month; Business costs $29.99 a month, and Enterprise costs $49.99 a month. A 14-day trial is listed. The maker is based in Geneva, Switzerland, and was founded in 2022.