eSignatures.com API vs OpenSign
eSignatures.com API
esignatures.com
OpenSign
opensignlabs.comSide by side
| Figure | eSignatures.com API | OpenSign |
|---|---|---|
| Price from | — | $9.99/mo |
| Free plan | — | 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 | 3 | 5 |
| Spec score · E-Signature APIs Software | 8.2 (#11) | 9.0 (#3) |
| Spec score · Electronic Signature APIs | 8.1 (#13) | 8.9 (#2) |
| Integrations | The product lists Google Drive, Zapier, Make, Claude, ChatGPT, webhooks, and its REST API as integration options. | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. |
| Product | The REST API lets customers create, customize, send, and manage contracts and signers, then receive lifecycle updates through webhooks. | OpenSign describes itself as an open-source PDF e-signature solution for signing, storing, and securing documents. |
| Security | The maker says it is ISO 27001 certified, uses AWS, encrypts data in transit with TLS and at rest with AES-256, and provides tamper-evident audit trails. | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. |
| Support | The pricing page states a support response time of less than two business days. | The documentation directs users to contact OpenSign support at [email protected] for assistance. |
Plans
eSignatures.com API
- SMS add-on$0.09, paid once
- Pay-as-you-go$0.49, paid once
- Live photo ID verification add-on$2.99, paid once
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
In their own words
eSignatures.com API
eSignatures.com 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.