OpenSign vs Signable API
OpenSign
opensignlabs.comSignable API
developers.signable.appSide by side
| Figure | OpenSign | Signable API |
|---|---|---|
| Price from | $9.99/mo | £40/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 | 5 | 4 |
| Spec score · Digital Signature API Software | 9.0 (#2) | 7.6 (#20) |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | The company lists integrations including Google Drive, Zapier, Google Docs, Make, HubSpot, and Slack. |
| Security | The API documentation lists TLS-encrypted transport, audit trails, IP logging, and tamper-evident signed PDFs. | Signable says its envelopes can be password protected and its audit trail records signer IP address, timestamps, and browser information. |
| Support | The documentation directs users to contact OpenSign support at [email protected] for assistance. | The pricing page says UK-based support is included as standard with all plans. |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
Signable API
- Pay As You Go£2.60, paid once
- Essentials£480 a year
- BusinessPriced on request
- 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.
Signable API
Signable API has no write-up on Specifiction yet; its figures are above.