Best Open Source Document Signing Tools in 2026

DocuSign costs $10-65/user/month. HelloSign starts at $15/month. Here are the best open source e-signature tools.

Quick Comparison

Tool	Best For	License	Stars	Self-Host
Documenso	Best overall	AGPL-3.0	8K+	Docker
OpenSign	Simple signing	AGPL-3.0	3K+	Docker
DocSeal	Template-based	AGPL-3.0	7K+	Docker

Detailed Breakdown

Documenso — Best Overall

Replaces: DocuSign, HelloSign

• Beautiful signing experience
• Document templates
• Multiple signers
• Custom fields (signature, text, date, checkbox)
• API access (REST)
• React embedding component
• Webhook notifications
• Audit trail
• Self-hosted or cloud

Best for: Companies who need professional e-signatures with API access.

OpenSign — Simplest Option

Replaces: DocuSign (basic)

• Upload and sign documents
• Multiple signers
• Template creation
• Contact management
• Dashboard and tracking
• API access

Best for: Small businesses who need basic document signing.

DocSeal — Best Templates

Replaces: DocuSign (template-heavy workflows)

• Template-based signing
• Custom form fields
• Bulk sending
• API for automation
• Multiple signers
• Mobile-responsive signing
• Self-hosted or cloud

Best for: Businesses with repeated document types (contracts, NDAs, offers).

Cost Savings

Team Size	DocuSign Business	Self-Hosted Documenso	Annual Savings
5 users	$1,500/year	$60/year (VPS)	$1,440
20 users	$6,000/year	$60/year	$5,940

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Compare all e-signature tools on OSSAlt — features, API access, and pricing side by side.