OpenSign
8.4#1 in e-signature softwareFrom $9.99 a monthFree planWebAPILinuxmacOS
VisitOpenSign vs Sertifi by Flywire
Sertifi by Flywire
8.7#3 in e-signature toolsFree planFree planAndroidiOSWebAPI
VisitWhat both publish
| Fact | OpenSign | Sertifi by Flywire |
|---|---|---|
| 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 |
OpenSign plans
- FreeFree
- Professional$9.99 a month
- Teams$19.99 a month
- EnterprisePriced on request
Sertifi by Flywire plans
- Free Travel Company AuthorizationsFree
- Essentials—
- Premium—
- Basic$30 a month
- Event & Venue PremiumPriced on request
- Event & Venue EssentialsPriced on request
Pick OpenSign if…
OpenSign may suit individuals and businesses that need PDF signing, reusable templates, or API-based signing workflows. It also offers self-hosting instructions for those who want to run it on Linux, macOS, or Windows.
Pick Sertifi by Flywire if…
You want what its maker publishes above — check its page for the details.