GreenCart | Multi-Vendor Organic Grocery Marketplace Flutter App + Next.js

GreenCart Market — a complete multi-vendor organic grocery marketplace

GreenCart Market is a 6-surface bundle: three Flutter apps (customer + rider + vendor) plus one Next.js 16 project that is the public storefront, the /vendor portal, the /admin panel, and the only backend. It is a vertical marketplace for organic / local / farm-to-table grocers, built on a modern TypeScript stack (Next.js + PostgreSQL + Drizzle) — not the PHP/Laravel platforms that dominate this category. Two differentiators the incumbents lack: subscription produce boxes and product provenance / sourcing.

Live preview

https://greencart.devsnack.dev

Demo access

Try the live demo with the accounts below. (The downloadable package itself ships with an empty database by design — no bundled credentials — so you create your own data and promote your first account to admin.)

• Admin — Web /admin — admin@greencart.test / password123
• Vendor — Web /vendor + vendor app — sunny@greencart.test / password123
• Customer — Web storefront + customer app — customer@greencart.test / password123
• Rider — Rider app — rider1@greencart.test / password123

Demo APKs

• Customer app (Android APK): https://drive.google.com/file/d/1xRznhg34VOUoiMeA8mvYnSmRLpVUJxZ9/view?usp=sharing
• Rider app (Android APK): https://drive.google.com/file/d/1S19BW_lQk42b_fCyBM9Q0llA37zFLFxB/view?usp=sharing
• Vendor app (Android APK): https://drive.google.com/file/d/13q-Mx07739PuRGmOH6cPqBANhuB6xI51/view?usp=sharing

All three APKs are pre-pointed at the live demo backend (https://greencart.devsnack.dev), so they work out of the box with the demo credentials above.

✨ Highlights

• Multi-vendor cart → per-vendor order split — one cart spanning many stores becomes one order + N sub-orders, each fulfilled, tracked, and settled independently.
• Product provenance / sourcing — every product carries a farm/origin “provenance card.”
• Subscription produce boxes — recurring weekly/biweekly boxes with skip / pause / resume.
• Live delivery tracking + a full rider app — turn-by-turn Google Maps navigation, proof-of-delivery photo, COD cash collection.
• Stripe + PayPal + COD — platform-collected, with real refunds.
• Commission ledger + vendor payouts — every sub-order records commission; balances accrue and settle per period.
• Vendor portal + super-admin panel — onboarding, products, payouts, coupons, KPIs, reports, CSV export, churn.
• Vendor Flutter app — vendors run the store from a phone: dashboard with a sales sparkline, incoming orders with status transitions, products with inline stock and publish toggles, image upload, earnings + payout ledger, reviews. Backed by a dedicated tenant-isolated /api/vendor/* REST surface.
• AI recipe & seasonal picks — OpenAI or Gemini, server-side, rate-limited, with a mock fallback.
• “Modern Agrarian” design system — one Tailwind v4 theme + matching Flutter ThemeData, white-labelable at runtime.

Tech stack

• Web + Backend: Next.js 16 · React 19 · TypeScript · Drizzle ORM · PostgreSQL (Neon) · JWT (jose) + argon2 · Stripe · PayPal · COD · commission ledger · Cloudflare R2 · Vercel Cron · Tailwind v4 · shadcn/ui · recharts · OpenAI / Gemini (optional)
• Mobile: Flutter 3.x · Dart 3 · Riverpod 3.x · GoRouter · freezed · Dio (typed API client) · flutter_stripe · webview_flutter (PayPal) · google_maps_flutter · firebase_messaging (push) · cached_network_image · google_mobile_ads (optional) · flutter_secure_storage (JWT)

What’s included

• Full source for all four apps (3 Flutter + 1 Next.js project/backend).
• Complete Drizzle schema + SQL migrations.
• “Modern Agrarian” design system (Tailwind theme + Flutter ThemeData).
• Branding pipeline — one SVG mark regenerates every web icon + both launcher icons.
• Buyer documentation, 20-minute quick-start, and the Vercel + Neon deploy guide.
• Vitest backend suites + Flutter unit/widget tests.
• 6 months Item Support + free future updates.
• (No demo seed — the database ships empty.)

⚡ Quick setup

1. Provision Postgres (Neon free tier) and set the 5 required env vars.
2. cd web && npm install && npm run db:migrate.
3. npm run dev → register a user → promote it to admin in db:studio.
4. Deploy web/ to Vercel (Root Directory = web); the 2 cron jobs run automatically.
5. Wire Stripe / PayPal / R2 / Firebase / Maps env as needed (all optional; COD works alone).
6. flutter pub get + set API_BASE_URL in each dart_defines.json.
7. flutter build appbundle/ipa --release --dart-define-from-file=dart_defines.json.

✅ Requirements

Node 20+, Flutter 3.x, a Postgres URL (Neon free tier), a Vercel account (free tier), plus an Apple Developer + Google Play Console account for store distribution. Optional integrations all have free tiers: Stripe (test), PayPal (sandbox), Firebase (Spark), Cloudflare R2 (free class , OpenAI or Gemini.

⚠️ Third-party service costs — please read: This item is sold as source code only. It integrates optional third-party services that you connect using your own accounts, and the buyer is solely responsible for any and all costs, fees, or charges incurred by these third-party services — including OpenAI, Gemini (Google AI), Stripe, PayPal, Google Maps, and Firebase (as well as Cloudflare R2 and your Postgres/hosting provider). These may include API, usage, transaction, subscription, and hosting fees, and are not included in and are entirely separate from the one-time purchase price of this item. This item does not provide, cover, or reimburse any third-party subscription, API credits, or processing fees.

️ On the roadmap (env-wired / stubbed — not yet shipped)

Server-side FCM push send (token storage is shipped), phone OTP and Google sign-in (email/password is the shipped auth), multi-language / RTL, and Stripe Connect auto-payouts (manual payout settlement ships). These are called out so there are no surprises.

Support

6 months of Item Support is bundled per the CodeCanyon standard — reach us through the Support tab on this item page. You supply your own hosting / database / payment / Firebase accounts.

Changelog

1.1.0 — 2026-08-12 — New: vendor Flutter app. A third mobile app (vendor_app/) so vendors can run their store from a phone — dashboard with a 14-day sales sparkline, orders with server-driven status transitions, products with inline stock/publish toggles and image upload, earnings + payout ledger, reviews, notifications, store settings, and an “application pending” state for unapproved vendors. Backed by a new /api/vendor/* REST surface (15 endpoints) so the vendor data layer is reachable over HTTP, not just from the web portal. Also hardened the vendor tenant-isolation and error contract: scoped writes now refuse rather than silently no-op, and validation, ownership and server faults map to distinct status codes. Backend suite 157 → 202 tests.

1.0.0 — 2026-06-16 — Initial release.