SignaFlow: Legal Tech SaaS for Digital Contracts
A production-ready legal tech platform that compresses the entire contract lifecycle — from drafting to signed PDF — from days of back-and-forth into under 5 minutes. Powered by Gemini 2.0 Flash for AI generation and Canvas API for legally valid digital signatures with an immutable SHA-256 audit trail.
Try SignaFlow Live
Create a contract with AI and send it for signature — free account, no credit card
Platform Walkthrough
Complete walkthrough: AI contract generation → digital signature → audit-sealed PDF
Platform Interface
AI Contract Editor
Describe your contract, get professional legal text in 30s
Contract Dashboard
Real-time status: drafts, sent, viewed, signed
The Problem: Contracts Are Broken
For freelancers, consultancies, and small businesses, contracts are a daily pain point. Writing a custom contract from scratch takes 2+ hours — and that's before the back-and-forth of chasing signatures. Physical paper, scanned PDFs, and email threads introduce delays measured in days, and leave zero legally defensible audit trail if a dispute arises.
- ✕2+ hours to draft a single contract manually, even with templates
- ✕5–7 days average signature turnaround (print → sign → scan → email)
- ✕No proof of when the document was opened, read, or signed — zero non-repudiation
- ✕Physical documents can be falsified, lost, or altered without a digital hash to detect tampering
The SignaFlow Solution
SignaFlow compresses the full contract lifecycle — CREATE → SAVE → SEND → VIEW → SIGN → DOWNLOAD — into a single, seamless flow that takes minutes, not days. The platform combines AI generation, cryptographic audit trails, and a professional PDF engine into a product any business can use without legal expertise.
AI Contract Generation
Describe your contract in plain language — "service agreement for 3-month web development project, $5,000, with IP transfer clause" — and Gemini 2.0 Flash generates a complete professional legal contract in under 30 seconds. Includes standard clauses, obligations, dispute resolution, and signature blocks.
Digital Signature System
Canvas API-based signature capture supporting both mouse and multi-touch. Signers can draw their handwritten signature or choose from multiple professional font styles for a typed signature — all captured as a PNG and embedded in the final PDF with precise metadata.
SHA-256 Audit Trail
Every action is captured with millisecond-precision timestamp, IP address, browser fingerprint, device info, and signer identity. A SHA-256 hash is computed over all this data and embedded in the document — making falsification cryptographically impossible and providing full non-repudiation for legal disputes.
Professional PDF Output
The signed contract is auto-generated as a professional PDF with your company logo, full contract body, the signer's signature image, and a tamper-evident audit seal showing the verification ID, timestamp, and cryptographic hash. Ready for immediate legal use.
Audit Trail Data Captured Per Signature
{
"verification_id": "SF-2025-A1B2C3D4",
"timestamp": "2025-03-08T14:23:45.892Z", // millisecond precision
"signer_name": "John Smith",
"signer_email": "john@example.com",
"ip_address": "201.175.42.X",
"browser_fingerprint": "Mozilla/5.0 ... Chrome/120",
"device_type": "desktop",
"document_hash": "sha256:e3b0c44298fc1c149a...", // full document SHA-256
"action": "SIGNED",
"geolocation": "Mexico City, MX" // optional
}Complete Contract Lifecycle
Security Architecture
SignaFlow was built with a security-first architecture. The Firestore rules enforce strict ownership boundaries at the database level — no middleware can be bypassed. Client-facing links expose only the minimum necessary data for signing, with no access to other users' contracts.
Measurable Impact
Time Savings
- Contract creation: 2 hours → 30 seconds (98% reduction)
- Signature collection: 5-7 days → minutes
- A consultancy closing 3 contracts/week saves 40+ hours/month
- No legal review needed for standard contracts — AI handles clause selection
Legal Certainty
- 100% audit trail — every event timestamped and hashed
- 0 falsification possible — SHA-256 non-repudiation guarantee
- Signer IP, device, and browser fingerprint captured on every signature
- Compliant with electronic signature standards for business contracts
Try SignaFlow Free
Create your first AI-generated contract and send it for signature in under 5 minutes — no credit card required.