SignCraft — Open-Source AI Contract Review & E-Signature Platform

The free, open-source alternative to DocuSign, Adobe Sign, and PandaDoc — with AI-powered contract analysis built in.

Why SignCraft?

Most e-signature tools just collect signatures. SignCraft reviews your contracts before you sign them.

• AI Contract Review — Clause-by-clause risk analysis with green/yellow/red flags
• AI Drafting — Generate NDAs, SaaS agreements, employment contracts, and 6+ contract types from a prompt
• E-Signatures — Send, sign, and countersign with full audit trail and legal compliance
• 9 Legal Templates — NDA, SAFE, SaaS Terms, IP Assignment, Consulting Agreement, and more
• Embeddable Signing — Drop a signing widget into any website or pitch deck
• 100% Self-Hostable — Your contracts never leave your server
• No Vendor Lock-in — MIT license, works with any LLM via OpenRouter

Comparison

Feature	SignCraft	DocuSign	Adobe Sign	PandaDoc
E-Signatures	Yes	Yes	Yes	Yes
AI Contract Review	Yes	No	No	No
AI Clause Drafting	Yes	No	No	No
Self-Hosted	Yes	No	No	No
Open Source	Yes	No	No	No
Embeddable Widget	Yes	No	No	No
Free	Yes	$10-60/mo	$15-30/mo	$19-65/mo

Features

AI-Powered Contract Drafting

Describe what you need in plain English and SignCraft generates a complete, legally-structured contract. Choose from templates or start from scratch.

Intelligent Contract Review

Before you sign, SignCraft's AI analyzes every clause and flags potential risks:

• Green — Standard, fair terms
• Yellow — Clauses that need attention
• Red — Potentially unfavorable or risky terms

Full E-Signature Workflow

1. Draft or upload a contract
2. Pre-sign as sender (optional)
3. Send to recipient via email
4. Recipient reviews, signs electronically
5. Countersign if needed
6. Both parties receive executed copies

Legal Templates

Built-in templates for common agreements:

• Non-Disclosure Agreement (NDA)
• SAFE (Simple Agreement for Future Equity)
• SaaS Terms of Service
• Consulting Agreement
• Employment Agreement
• IP Assignment
• Freelance Contract
• Partnership Agreement
• Lease Agreement

Audit Trail

Every action is logged with timestamps, IP addresses, and user agents — meeting ESIGN Act and UETA compliance requirements.

Embeddable Signing

Embed a signing experience directly into your website, pitch deck, or application with a single URL.

Tech Stack

• Framework: Next.js 16 (App Router)
• Editor: TipTap (rich text)
• Database: Supabase (PostgreSQL + Auth)
• AI: OpenRouter (compatible with GPT-4, Claude, Gemini, and more)
• PDF: react-pdf/renderer
• Email: Nodemailer (Gmail SMTP or any SMTP provider)
• SMS: Twilio (optional)
• Styling: Tailwind CSS + shadcn/ui
• Deployment: Vercel

Quick Start

Prerequisites

• Node.js 18+
• A Supabase project
• An OpenRouter API key

1. Clone and install

git clone https://github.com/Steviewonders99/signcraft.git
cd signcraft
npm install

2. Set up environment variables

cp .env.local.example .env.local

Edit .env.local with your credentials:

# Supabase
NEXT_PUBLIC_SUPABASE_URL=your-project-url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key
SUPABASE_SERVICE_ROLE_KEY=your-service-role-key

# AI (OpenRouter — works with any model)
OPENROUTER_API_KEY=your-openrouter-key
OPENROUTER_MODEL=google/gemini-2.5-flash

# Email (Gmail SMTP)
GMAIL_USER=your-email@gmail.com
GMAIL_APP_PASSWORD=your-16-char-app-password

# App URL
NEXT_PUBLIC_APP_URL=http://localhost:3000

3. Set up the database

Run the Supabase migrations:

npx supabase db push

Or manually run the SQL files in supabase/migrations/ in your Supabase SQL editor.

4. Start the dev server

npm run dev

Open http://localhost:3000.

Deployment

Vercel (Recommended)

1. Click the button above or run:

   vercel --prod

2. Add your environment variables in the Vercel dashboard
3. Add your Vercel URL to Supabase Auth redirect URLs

Self-Hosted

SignCraft is a standard Next.js application. Deploy it anywhere that runs Node.js:

npm run build
npm start

Email Setup

SignCraft uses Gmail SMTP by default. To set it up:

1. Go to Google Account Security
2. Enable 2-Factor Authentication
3. Generate an App Password
4. Add the credentials to your .env.local

You can also use any SMTP provider by modifying src/lib/mailer.ts.

Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

License

MIT — see LICENSE for details.

Unlike most e-signature platforms that use AGPL (which restricts commercial use), SignCraft uses the MIT license. Use it however you want — commercial, personal, modified, redistributed. No restrictions.

Alternatives

Looking for comparisons? See how SignCraft stacks up:

• SignCraft vs DocuSign
• SignCraft vs Adobe Sign
• SignCraft vs PandaDoc
• SignCraft vs Documenso

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Built with AI by Steven Junop