Lucent

Lucent is a free, no-login AI spend audit platform for startup founders, CTOs, and engineering managers. Users enter their AI tool stack, run a two-minute audit, and receive a shareable report with deterministic savings recommendations plus an AI-written summary.

Live Demo

Deployed Site Screenshots

Homepage audit form

Audit results overview

Per-tool recommendations

Decisions

1. Single repo Next.js architecture: Kept the frontend,API routes and deployment in one project.
2. Rule-based audit logic: Cost recommendations are purely mathematical without AI generated Output to prevent Hallucinations and misappropriate results.
3. AI only for summary copy: For Demo usage using Gemini Free API improve readability,while core savings math stays outside the LLM.
4. Post-value lead capture: Users sees the result before inputing the email to capture the main focal and MVP of the website.
5. PII-safe public reports: shared report only share the saving and recommendation and not the email/personal information.

Features

• Instant AI spend audit: captures tools, plans, seats, spend, team size, and primary use case.
• Deterministic audit engine: savings math is rule-based and testable, not LLM-generated.
• AI summary: Gemini writes a concise personalized summary on top of computed audit results.
• Lead capture after value: email is requested only after the user sees the report.
• Shareable public report: /r/[publicId] strips identifying details and keeps the output safe to share.
• Confidence and priority signals: recommendations include confidence labels and a top-action queue.

Quick Start

Install

npm install

Configure Environment

Create .env from .env.example and add the required keys:

cp .env.example .env

Required for the full app flow:

• NEXT_PUBLIC_APP_URL
• NEXT_PUBLIC_SUPABASE_URL
• NEXT_PUBLIC_SUPABASE_ANON_KEY
• SUPABASE_SERVICE_ROLE_KEY
• GEMINI_API_KEY
• GEMINI_MODEL
• RESEND_API_KEY
• RESEND_FROM_EMAIL

Run Locally

npm run dev

Open http://localhost:3000.

Test and Build

npm run lint
npm run test
npm run build

Deploy

1. Import the GitHub repository into Vercel.
2. Add all environment variables from .env.example.
3. Apply the Supabase SQL migration in supabase/migrations.
4. Verify the flow: / -> /audit/[id] -> /r/[publicId].

Tech Stack

Layer	Technology
Framework	Next.js App Router
Language	TypeScript
Styling	Tailwind CSS
Database	Supabase Postgres
AI Provider	Google Gemini API
Email	Resend
Hosting	Vercel
Validation	Zod
Testing	Vitest

Core Audit Flow

graph TD
    A[User enters AI stack] --> B[POST /api/audit]
    B --> C[Rule-based audit engine]
    C --> D[Persist audit in Supabase]
    D --> E[Private results page]
    E --> F[Gemini summary]
    E --> G[Lead capture]
    E --> H[Public report link]

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Available Scripts

Command	Description
npm run dev	Start local development server
npm run build	Build production app
npm run start	Start production server
npm run lint	Run ESLint
npm run test	Run Vitest

Deployed URL

https://lucent-rose.vercel.app