Esig API vs OpenSign
Esig API
esig.ca
OpenSign
opensignlabs.comSide by side
| Figure | Esig API | OpenSign |
|---|---|---|
| Price from | ₹1,666.67/mo | $9.99/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 4 | 5 |
| Spec score · Electronic Signature APIs | 8.0 (#16) | 8.9 (#2) |
| API | Business Pro and Enterprise include API access and webhooks for agreement lifecycle events. | OpenSign exposes a REST API authenticated with an x-api-token header and provides sandbox, production and EU endpoints. |
| Bulk send | Users can upload a CSV to create a separate envelope for each recipient, and PowerForms provide self-service signing links. | Yes |
| Integrations | The homepage names Slack, Google, Outlook, HubSpot, Stripe, Notion, Dropbox, Salesforce, Zapier, Teams, and QuickBooks as tools in its ecosystem. | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. |
| Intended users | The maker describes Personal for solo operators, Standard for small teams, Business Pro for operations-heavy teams, and Enterprise for companies needing admin control. | The documentation describes the product as designed for individuals and businesses, from startups to large corporations. |
| Product | Esig is an e-signature service for preparing, sending, signing, and tracking agreements. | OpenSign describes itself as an open-source PDF e-signature solution for signing, storing, and securing documents. |
| Security | Esig says documents are stored on private disks, secrets are encrypted at rest, and signers use a six-digit access code before signing. | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. |
| Support | The site lists [email protected] and the phone number +1 (343) 700-0633. | The documentation directs users to contact OpenSign support at [email protected] for assistance. |
Plans
Esig API
- PersonalFree
- Standard₹20,000 a year
- Business Pro₹34,000 a year
- EnterprisePriced on request
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced 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.