OpenSign vs Sertifi by Flywire
OpenSign
opensignlabs.comSertifi by Flywire
corp.sertifi.comSide by side
| Figure | OpenSign | Sertifi by Flywire |
|---|---|---|
| Price from | $9.99/mo | Free |
| 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 | 13 |
| Spec score · E-Signature Software | 9.0 (#4) | 8.8 (#9) |
| Spec score · Electronic Signature APIs | 8.9 (#2) | 8.7 (#4) |
| Spec score · Electronic Signature Software | 9.0 (#3) | 8.8 (#6) |
| Spec score · E-signature tools | 8.9 (#10) | 9.2 (#6) |
| API access | Yes | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | Yes |
| Documentation | The official documentation includes user help, API references, contribution guidance and self-hosting instructions. | The support center contains sections for e-signatures, payments, authorizations, integrations, API, release notes, data tags, roles, tutorials, videos, and fraud prevention. |
| Document templates | Yes | Yes |
| Free plan | Yes | No |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | Named integrations include Amadeus Delphi, Salesforce, Oracle OPERA Cloud and OPERA 5, Infor HMS and Sales & Catering, Nintex, Zuora, and SSO. |
| Licence | The source code and API documentation identify the project as licensed under GNU AGPL v3.0. | The terms describe Sertifi software, APIs, source code, and interfaces as proprietary intellectual property and prohibit copying, reverse engineering, or deriving source code. |
| Notable news | OpenSign announced version 1.5.0 on June 12, 2024 with custom email templates, revoke controls, enterprise branding, API enhancements and usage analytics. | Sertifi announced in its newsroom that SertifiPay won Best Payments Solution in the 2025 HotelTechAwards for the second consecutive year. |
| Rating on Capterra | 4.7 out of 5 from 3 reviews. | 4.8 out of 5 from 11 reviews |
| Rating on Gartner Peer Insights | Gartner Peer Insights lists OpenSign but shows no reviews yet. | 3.2 out of 5 from 2 ratings |
| Rating on Trustpilot | 3.6 out of 5 from 4 reviews. | 3.3 out of 5 from 1 review |
| Signature order | both | both |
| SMS authentication | Yes | Yes |
Plans
OpenSign
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- FreeFree
- EnterprisePriced on request
Sertifi by Flywire
- Free Travel Company AuthorizationsFree
- EssentialsPriced on request
- EssentialsPrice not published
- PremiumPriced on request
- PremiumPrice not published
- Basic$30 a month
- Build-your-own packagePriced on request
- Event & Venue EssentialsPriced on request
- Event & Venue PremiumPriced on request
- Hotel & Lodging EssentialsPriced 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.
Sertifi by Flywire
Sertifi by Flywire has no write-up on Specifiction yet; its figures are above.