DocuPilot AI

1. Short Overview

DocuPilot AI is a full-stack SaaS document generation platform powered by Google Gemini AI that instantly converts structured form inputs into professional-grade business and legal documents.

It is built for freelancers, consultants, and small business owners who regularly need documents like invoices, contracts, NDAs, proposals, resumes, and more — without starting from scratch, paying for expensive tools, or hiring legal help.

2. Tech Stack

Category Technology Framework Next.js 16.2.6 (App Router, RSC) Language TypeScript 5 (strict mode) AI Google Gemini (gemini-3-flash-preview) via @google/genai v2 Database Supabase (PostgreSQL) Authentication Supabase Auth (Email/Password + OAuth) Payments Stripe (Checkout, Webhooks, Billing Portal) Styling Tailwind CSS v4 + shadcn/ui + Lucide React PDF Export @react-pdf/renderer v4 DOCX Export docx v9 Forms & Validation react-hook-form v7 + Zod v4 Notifications Sonner v2 Runtime React 19.2.4 Deployment Vercel (SSR-ready architecture)

3. Problem Solved

Creating professional documents is still slow, repetitive, and expensive.

Freelancers and small businesses typically:

Use generic templates that still require heavy editing

Pay for enterprise legal/document tools

Or spend hours formatting documents manually

DocuPilot AI removes this friction by transforming structured input into fully written, professionally formatted documents in seconds using AI.

4. Key Results & Highlights

9 AI-powered document types generated from structured inputs

Dual export system: PDF (free) and DOCX (premium)

In-browser export with zero backend rendering dependency

AI-powered section-level editing (rewrite, simplify, translate, improve tone)

Shareable document links with secure expiring tokens

Template marketplace (save, fork, reuse workflows)

Stripe-powered freemium model with full billing lifecycle

Server-side usage enforcement with monthly quota resets

Production-grade authentication with Supabase SSR + OAuth support

Fully responsive UI with dark/light mode support

5. Problem (Context)

Professionals constantly need documents like:

Contracts before starting work

Invoices after project completion

NDAs before discussions

Proposals to win clients

But existing solutions are either:

Too generic (template-based tools)

Too expensive (enterprise legal platforms)

Or too manual (word processors + formatting effort)

There is no fast, AI-native, affordable system built specifically for independent professionals.

6. Solution

DocuPilot AI solves this with a structured AI pipeline:

User selects a document type

Fills a guided structured form

Data is sent to a domain-specific Gemini prompt engine

AI returns structured JSON sections

The app renders it into an editable document interface

Users can then:

Edit sections with AI (tone, clarity, summarization, translation)

Export as PDF or DOCX

Save as reusable templates

Share via secure public links

All within a single, unified SaaS experience.

7. Core Features

AI Document Generation

Form-to-document pipeline powered by Gemini with custom prompt builders and strict Zod validation per document type.

Supported Document Types

Invoice

Contract

NDA

Business Proposal

Quotation

Scope of Work

Resume

Cover Letter

Employment Letter

AI Section Editor

Inline AI tools per section:

Rewrite

Simplify

Make Professional

Summarize

Translate

Export Engine

PDF export via @react-pdf/renderer

DOCX export via docx (premium tier)

Document Sharing

Secure shareable links

Expiring tokens stored in database

Public read-only route for clients

Template System

Save reusable templates

Fork public templates

Customize workflows per use case

Freemium Billing

Free: 3 documents/month

Premium: $19/month unlimited access

Stripe Checkout + Billing Portal + Webhooks

Usage Enforcement

Server-side quota tracking

Monthly reset via Supabase RPC

Authentication & Security

Supabase Auth (Email + OAuth)

SSR session handling

Middleware route protection

UX Enhancements

Dark/light mode

Responsive dashboard

Usage analytics

Toast notifications

8. Stack (Full Architecture Overview)

Frontend

Next.js 16 App Router, React 19, TypeScript strict mode, Tailwind CSS v4, shadcn/ui

Backend

Next.js API Route Handlers (13 endpoints) + Supabase service role client

Database

Supabase PostgreSQL:

profiles

documents

templates

document_shares

subscriptions

AI Layer

Google Gemini (gemini-3-flash-preview) with:

9 domain-specific prompt builders

structured JSON outputs

configurable temperature control

Payments

Stripe v22:

Checkout sessions

Subscription lifecycle

Billing portal

Webhook handling

Export System

PDF: @react-pdf/renderer

DOCX: docx v9

Client-side download handling

9. My Role

As the sole developer, I handled the entire product lifecycle:

Designed full system architecture (App Router + RSC + API layer separation)

Built AI pipeline with structured prompt registry (9 document-specific engines)

Developed all backend API routes (13 endpoints)

Designed Supabase schema and server-side usage enforcement logic

Implemented authentication with SSR session handling and OAuth flows

Integrated full Stripe billing lifecycle (checkout, webhooks, subscriptions)

Built export engine for both PDF and DOCX formats

Developed full UI using RSC + shadcn/ui + Tailwind

Implemented secure sharing system with expiring tokens

Built dashboard analytics and usage tracking system

10. Live URL

https://docupilot-ai-seven.vercel.app/

11. GitHub Repository

https://github.com/engraya/DocupilotAI