DevPreFlight Production Boilerplates
GitHub Browse Kits

Starter Kits, Boilerplates & UI Modules

Production-grade code for every stack. Browse our full catalog of modular starter kits, flat UI components, and backend engines, each with instant digital delivery via Polar.sh.

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Showing 14 starter kits & modules
React 19 & Next.js 16 Tier 1: Micro Module Available Now

PreFlight Flat UI Component Kit

60+ Accessible flat white & blue UI components for React 19 & Next.js 16

React 19Next.js 16TypeScriptTailwind CSSWCAG AAAAI ReadyFree Open Source
Select License:
Solo Developer For 1 developer building personal or single commercial SaaS projects.
  • 60+ copy-paste modern flat components in React 19 & Tailwind CSS
  • Free open-source community starter edition available on GitHub
  • Next.js 15 & 16 Turbopack compatible with zero breaking changes
Setup: 2 minutes 4,800+ LOC
$ 29 $49
Standard License • Lifetime updates
FREE REPO Open-source core edition on GitHub ↗
Specs & Docs Get Access
All Stacks Included Tier 3: Mega Bundle In Dev

DevPreFlight All-Access Mega Bundle

Every boilerplate, starter kit, and UI module in one ultimate lifetime package

SvelteKit 5React (Next.js 16)Flutter (Dart)FastAPIBilling EngineSupabase
  • Includes ALL Tier 1, Tier 2, and Tier 3 boilerplates in one package
  • Global checkout, webhook sync, and customer portal pre-configured
  • Full-stack templates for SvelteKit 5, React (Next.js 16), Flutter, and FastAPI
Setup: 5 minutes 35,000+ LOC
$ 149 $299
Planned Launch Price • Lifetime updates
Specs & Docs
Flutter (Dart) Tier 3: Mega Starter In Dev

FlutterFlight Pro Mega Starter

Cross-Platform Flutter SaaS Boilerplate for iOS, Android & Web

Flutter 3.xDart 3.xRiverpodSupabaseBilling SyncFirebase Push
  • Universal codebase compiling natively to iOS, Android, macOS, and Web
  • Web-to-mobile subscription sync (0% app store commission via web checkout)
  • Supabase authentication (Google, Apple Sign-In, Email OTP) with secure keychain
Setup: 10 minutes 12,400+ LOC
$ 119 $179
Planned Launch Price • Lifetime updates
Specs & Docs
React (Next.js 16) Tier 3: Mega Starter In Dev

NextLaunch Pro Mega Starter

Enterprise-Grade React (Next.js 16) Full-Stack SaaS Boilerplate

React 19Next.js 16TypeScriptPrismaBilling EngineAuth.js v5
  • Next.js 16 App Router with React Server Components (RSC) & Server Actions
  • Unified subscription billing + tiered feature paywalls
  • Prisma ORM with PostgreSQL, MySQL, and SQLite support
Setup: 10 minutes 11,200+ LOC
$ 109 $169
Planned Launch Price • Lifetime updates
Specs & Docs
SvelteKit 5 Tier 3: Mega Starter In Dev

SvelteShip Ultra Mega Starter

The complete SvelteKit 5 SaaS Boilerplate for Indie Hackers

SvelteKit 5TypeScriptSupabaseDrizzle ORMBilling EngineResend
  • Svelte 5 Runes ($state, $derived, $effect) with 100% end-to-end type safety
  • Global checkout, webhook sync & customer portal out-of-the-box
  • Supabase authentication (OAuth, Magic Link, Password) + RLS policies
Setup: 5 minutes 8,400+ LOC
$ 99 $149
Planned Launch Price • Lifetime updates
Specs & Docs
React (Next.js 16) Tier 2: Core Kit In Dev

React (Next.js 16) Core Feature Kit

Essential React 19, Auth.js v5, Billing & Prisma Architecture

React 19Next.js 16TypeScriptPrismaBilling Engine
  • Server Actions & React 19 optimistic UI updates
  • Checkout redirects, webhook listeners & user tier gates
  • Prisma ORM with PostgreSQL database migrations
Setup: 5 minutes 5,100 LOC
$ 69 $99
Planned Launch Price • Lifetime updates
Specs & Docs
Flutter (Dart) Tier 2: Core Kit In Dev

Flutter SaaS Core Feature Kit

Flutter + Supabase Auth + Riverpod + Billing Sync

Flutter 3.xDart 3.xRiverpodSupabaseLicense Validator
  • Riverpod state management with immutable models & code generation
  • Supabase OAuth & email authentication with biometric unlock
  • License key and customer subscription validation service
Setup: 6 minutes 4,600 LOC
$ 59 $89
Planned Launch Price • Lifetime updates
Specs & Docs
SvelteKit 5 Tier 2: Core Kit In Dev

SvelteKit 5 Core Feature Kit

Essential Auth, Subscription Billing, and Database Architecture

SvelteKit 5TypeScriptSupabaseBilling EngineDrizzle ORM
  • Complete Auth & Session guards (OAuth, magic link, password)
  • Checkout helper, webhook router, and subscription gatekeeper
  • Drizzle ORM with PostgreSQL migrations and type-safe queries
Setup: 5 minutes 4,800 LOC
$ 59 $89
Planned Launch Price • Lifetime updates
Specs & Docs
AI / Multi-LLM Tier 2: Core Kit In Dev

AI Wrapper Launchpad Core

Turn any AI model into a monetized SaaS with token credits

SvelteKit / Next.jsGemini APIOpenAICredits & BillingRedis
  • Multi-LLM adapter supporting Google Gemini, Claude, and OpenAI
  • Credit ledger with automated credit package checkout
  • Real-time streaming text, markdown rendering, and code copy
Setup: 8 minutes 5,400 LOC
$ 69 $109
Planned Launch Price • Lifetime updates
Specs & Docs
Python (FastAPI) Tier 2: Core Kit In Dev

FastAPI TurboCore Backend Kit

High-Performance Python Microservices & Async Background Tasks

FastAPIPython 3.12CelerySQLAlchemy 2.0RedisDocker
  • Async SQLAlchemy 2.0 with Alembic database migrations & connection pooling
  • Celery background task execution with Redis broker & monitoring
  • Webhook signature verification and user plan synchronizer
Setup: 5 minutes 5,200 LOC
$ 49 $79
Planned Launch Price • Lifetime updates
Specs & Docs
Flutter (Dart) Tier 1: Micro Module In Dev

Flutter Paywall & License Validator Module

Drop-in Flutter Dart package for customer license validation & paywalls

Flutter 3.xDartBilling SDKSecure Storage
  • Clean Flutter paywall dialog with web checkout launcher
  • Local encrypted cache for subscription validity (works offline)
  • Single line helper: `PaywallGuard.hasActiveSubscription()`
Setup: 4 minutes 780 LOC
$ 24 $39
Planned Launch Price • Lifetime updates
Specs & Docs
React (Next.js 16) Tier 1: Micro Module In Dev

React (Next.js 16) Server Actions Billing Module

Drop-in React Server Actions & webhook signature verifier

React 19Next.js 16Server ActionsBilling SDK
  • Server Actions helper for instant checkout redirects with zero API route boilerplate
  • Edge-compatible webhook signature verifier following Standard Webhooks spec
  • Middleware paywall helper: `requireActiveSubscription()`
Setup: 3 minutes 720 LOC
$ 24 $39
Planned Launch Price • Lifetime updates
Specs & Docs
SvelteKit 5 Tier 1: Micro Module In Dev

SvelteKit Webhook & Checkout Commerce Engine

Single drop-in module for complete payments & subscription integration in SvelteKit

SvelteKit 5Billing SDKTypeScriptStandard Webhooks
  • Drop-in SvelteKit checkout helper with custom redirects and metadata
  • Cryptographic webhook signature verification in SvelteKit `+server.ts`
  • Event handlers for subscription.created, order.created, and canceled
Setup: 3 minutes 650 LOC
$ 24 $39
Planned Launch Price • Lifetime updates
Specs & Docs
Supabase & SQL Tier 1: Micro Module In Dev

Supabase Auth & RLS Rulepack

Zero-vulnerability Row-Level Security policies and OAuth auth flow

PostgreSQLSupabase RLSSQLAuth Guards
  • Audited PostgreSQL RLS policies preventing cross-user data leakage
  • Organization multi-tenancy rules (Owner, Admin, Member permissions)
  • SSR session verification hooks for SvelteKit and React (Next.js)
Setup: 3 minutes 900 LOC
$ 19 $35
Planned Launch Price • Lifetime updates
Specs & Docs