Document eSign API vs OpenSign
Document eSign API
documentesign.com
OpenSign
opensignlabs.comSide by side
| Figure | Document eSign API | OpenSign |
|---|---|---|
| Price from | $20/mo | $9.99/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 5 |
| Spec score · Electronic Signature APIs | 7.6 (#20) | 8.9 (#2) |
| Documentation | The API reference is available to read without an account and the maker publishes an OpenAPI 3.1 specification. | The official documentation includes user help, API references, contribution guidance and self-hosting instructions. |
| Intended users | The API is presented for developers adding embedded electronic signatures to a SaaS app or product. | The documentation describes the product as designed for individuals and businesses, from startups to large corporations. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
In their own words
Document eSign API
Document eSign API has no write-up on Specifiction yet; its figures are above.
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.