Dropbox Sign API vs OpenSign
Dropbox Sign API
sign.dropbox.com
OpenSign
opensignlabs.comSide by side
| Figure | Dropbox Sign API | OpenSign |
|---|---|---|
| Price from | $75/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 | 5 |
| Spec score · Electronic Signature APIs | 8.4 (#7) | 8.9 (#2) |
| Spec score · Digital Signature API Software | 8.4 (#8) | 9.0 (#2) |
| Integrations | Dropbox Sign integrates with Dropbox, Microsoft Word, Salesforce, Google Drive, HubSpot, Slack, and other CRM, storage, and productivity tools. | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. |
| Security | The service lists SOC 2 Type II, ISO 27001, eIDAS, and GDPR compliance, 2FA, and AES 256-bit encryption at rest. | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. |
| Templates | Reusable templates can contain preloaded data to speed up recurring signature processes. | Users can create reusable templates with pre-placed widgets and send them to one or many signers through the API. |
Plans
Dropbox Sign API
- Free packageFree
- Test modeFree
- Essentials$75 a month
- Standard$250 a month
- PremiumPriced on request
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
In their own words
Dropbox Sign API
Dropbox Sign API lets developers add electronic signature workflows to their own websites and applications. Embedded request, signing, and template-management steps can appear in iFrames, with custom branding for senders and signers. Reusable templates can hold preloaded data for recurring signature processes. The service connects with Dropbox, Microsoft Word, Salesforce, Google Drive, HubSpot, Slack, and other CRM, storage, and productivity tools. Its listed security provisions include OAuth 2.0, 2FA, AES 256-bit encryption at rest, and non-editable audit trails that time-stamp document actions. Dropbox Sign lists SOC 2 Type II, ISO 27001, eIDAS, and GDPR compliance. Its signatures are legally binding in the United States, European Union, United Kingdom, and many other countries. SDKs are available for Python, Ruby, PHP, Java, NodeJS, and C#, and development help is available through documentation, the Help Center, and email support engineers. Senders and signers can use the service end-to-end in 22 languages. Free plans are listed; paid pricing starts at $75/mo. More than 500 requests per month requires contacting sales.
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.