Inkless vs OpenSign
Inkless
inkless.co.uk
OpenSign
opensignlabs.comSide by side
| Figure | Inkless | OpenSign |
|---|---|---|
| Price from | £30/mo | $9.99/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 11 | 5 |
| Spec score · Digital Signature API Software | 6.5 (#28) | 9.0 (#2) |
Plans
Inkless
- Starter Pack£0.70, paid once
- Growth Pack£0.60, paid once
- Business Pack£0.50, paid once
- Scale Pack£0.45, paid once
- Enterprise£0.40, paid once
- CustomPriced on request
- Starter Subscription£30 a month
- Growth Subscription£110 a month
- Business Subscription£225 a month
- Scale Subscription£400 a month
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.