Legally Bulletproof
E-Signatures
Open-source e-signature platform with PKI infrastructure, RFC 3161 timestamps, and enterprise audit trails.
Self-host for free or use our managed cloud.
Enterprise Features, Self-Hosted
Everything you need for legally compliant e-signatures, from PKI security to audit trails. No artificial limits on the free tier.
PKI Security
RSA 4096-bit encryption with PKCS#7 digital signatures
RFC 3161 Timestamps
Cryptographic proof of signature time via TSA
Audit Trails
Immutable logs for legal compliance and forensics
Multi-Party Signing
Sequential and parallel signing workflows
Template Library
Pre-built templates for common documents
Mobile Signing
Native iOS and Android support with biometric auth
API Access
Full REST API for custom integrations
Webhooks
Real-time notifications for signature events
Custom Branding
White-label support with custom domains
Document Storage
Encrypted storage with S3-compatible backends
Advanced Fields
Text, checkboxes, dates, signatures, and initials
Email Notifications
Automatic reminders and status updates
Transparent Pricing. No Surprises.
No per-user fees. No per-envelope limits. Scale without vendor lock-in.
Self-Hosted
Full features, your infrastructure
- Unlimited signature requests
- PKI + TSA compliance
- Audit trails
- API access
- Community support
Managed Cloud
Hosted infrastructure, automatic updates
- Everything in Self-Hosted
- Managed hosting (99.9% uptime)
- Automatic backups
- Email support (24hr SLA)
- 100GB storage
Enterprise
Dedicated support, custom integrations
- Everything in Managed Cloud
- Dedicated Slack channel
- Custom deployment assistance
- SLA customization
- Priority feature requests
All plans include full feature access. Self-hosted is AGPL-3.0 licensed.
Need help choosing? Talk to our team
Built for Every Industry
From law firms to startups, Supersign handles signatures at any scale.
Law Firms
Legal compliance and audit trails
- ESIGN Act & UETA compliant
- Admissible in court
- Privileged communication support
- Multi-party engagement letters
Part of the Super Family
Supersign integrates seamlessly with other Super Family products for a complete business communication stack.
Supermark → Supersign
Share documents with Supermark, then send for signatures. Track both views and signatures in one place.
Superforms → Supersign
Collect data with Superforms, then convert to PDF and send for signatures automatically.
Legal Compliance Built-In
Supersign meets international e-signature regulations. Your signatures hold up in court.
ESIGN Act
US federal law establishing electronic signatures as legally binding
Since 2000UETA
Uniform Electronic Transactions Act (adopted by 47 states)
Since 1999eIDAS
EU regulation for electronic identification and trust services
Since 2014SOC 2 Type II
Security, availability, and confidentiality audit (managed cloud only)
Since 2024PKI Infrastructure
RSA 4096-bit encryption with PKCS#7 digital signatures. Each signature is cryptographically verified.
Timestamp Authority
RFC 3161 compliant TSA provides cryptographic proof of when documents were signed.
Immutable Audit Trails
Every action logged with tamper-evident records. Perfect for legal discovery and compliance audits.
Need a detailed compliance report for your legal team?
Download Compliance Documentation →Supersign vs DocuSign
See how we stack up against the industry leader. Spoiler: we're open source and more affordable.
Ready to Own Your E-Signature Stack?
Deploy Supersign on your infrastructure in minutes, or start a free trial on our managed cloud.
No credit card required.
Questions? Contact our team