plaquinhAI is a SaaS that uses AI to design the artwork for NFC and QR Code plaques for small businesses. The customer uploads their logo, picks where the plaque leads (Google reviews, Instagram, WhatsApp, Pix, Wi-Fi, menu and more, 12 types in total) and in about a minute gets 3 unique designs made for their business, which they can preview in 3D before paying. The downloadable kit has 300 DPI artwork, a print-ready PDF with bleed and crop marks, and STL 3D models of the plaque and stand. There are three ways to pay: a one-time purchase; Link Vivo, a subscription with a permanent link whose destination can be changed without reprinting, with time-based schedules, pause and tap analytics (NFC vs QR, device, hour); and monthly plans with art credits for print shops and resellers. The AI designs each artwork as SVG and keeps a per-segment memory: styles that sell become references for the next customers in the same segment (barbershop, burger joint, salon…). Model routing picks the cheapest model that can handle each design and escalates only when needed, and every artwork is rendered in headless Chromium with an automatic check that the QR Code is still readable. On the technical side, it runs on Next.js 16 and TypeScript, deployed on Firebase App Hosting with Firestore and Storage. Payments go through Asaas (Pix, card and subscriptions) and are confirmed by webhook against the gateway API, with idempotency and transactions. Resilience comes from circuit breakers, retries, generation jobs that survive a dropped connection, and a daily AI spend cap. It also includes an admin dashboard (revenue, MRR, AI cost), LGPD cookie consent with GA4 and Meta Pixel, and unit and integration tests on the Firebase emulator.

• Websitehttps://plaquinhai.com.br
• PlatformsWeb (NFC/QR Code)
• StacksNext.js 16, TypeScript, Firebase (App Hosting/Firestore/Storage/Auth), Claude API, Puppeteer, Three.js, Asaas