DocuSeal vs OpenSign

DocuSeal is an API-based electronic-signature service with document templates, bulk sending, SMS authentication and audit trails. It supports signing either in sequence or without a fixed order. The free Basic plan is billed at free and includes 10 field types and 10 request emails per month. Its free Open Source plan is described as free forever without limitations, with legally binding eSignatures, indefinite retention, user management, multiple signers and own SMTP email. Pro costs $20 a month and adds unlimited signature requests, spreadsheet bulk sending, SMS identity verification, API and embedding, SSO/SAML, and roles and teams. On-Premises Pro costs $240 a year and adds white-labeling and data control. An API Sandbox is free for development and testing. API Production costs $0.20 signed via API or embedding and requires Pro.

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.