Open SaaS Review 2026: Best Free SaaS Boilerplate

TL;DR

Open SaaS is the most feature-complete free SaaS boilerplate. Stripe billing, email, blog, admin panel, analytics (PostHog), OpenAI integration — all free. The trade-off: it's built on Wasp, a newer React/Node.js meta-framework with a smaller ecosystem than Next.js. If you evaluate Wasp and it fits your workflow, Open SaaS is exceptional value. If you need standard Next.js tooling, look at Next SaaS Starter instead.

Rating: 4/5

What You Get (Free)

Source: github.com/wasp-lang/open-saas | License: MIT | Stars: 8k+

Core features:

• Wasp (React + Node.js framework)
• TypeScript throughout
• Prisma + PostgreSQL
• Auth: Wasp Auth (email, Google OAuth, GitHub OAuth)
• Payments: Stripe (subscriptions + one-time payments)
• Email: SendGrid + Mailgun integration
• Blog: Astro-based blog (separate static site)
• Admin panel: User management + revenue metrics
• Analytics: PostHog + Plausible
• Background jobs: Wasp jobs (pg-boss queue)
• File upload: AWS S3
• AI: OpenAI integration

Price: $0. No license fee, no per-seat pricing, no vendor lock-in.

What is Wasp?

Wasp is a full-stack framework that simplifies React + Node.js development by declaring application structure in a .wasp config file:

// main.wasp — declare your app structure
app OpenSaaS {
  wasp: { version: "^0.14.0" },
  title: "Your SaaS",
  auth: {
    userEntity: User,
    methods: {
      email: {
        fromField: { name: "Your SaaS", email: "hello@yoursaas.com" },
        emailVerification: {
          clientRoute: EmailVerificationRoute,
          getEmailContentFn: import { getEmailVerificationEmailContent } from "@src/auth/emails",
        },
      },
      google: {},
      gitHub: {},
    },
  },
}

route DashboardRoute { path: "/dashboard", to: DashboardPage }
page DashboardPage {
  authRequired: true,
  component: import Dashboard from "@src/pages/Dashboard"
}

job emailNotificationJob {
  executor: PgBoss.new,
  perform: {
    fn: import { sendNotification } from "@src/jobs/email"
  },
  schedule: {
    cron: "0 8 * * 1"  // Every Monday at 8am
  }
}

Wasp generates the boilerplate (auth routes, API wiring, job queue setup, database client) from these declarations. You write only business logic. The generated code is standard React on the client and Node.js on the server.

The Stripe Integration

Open SaaS includes complete Stripe subscription billing with webhook handling:

// src/payments/stripeWebhookHandlers.ts
export const handleCustomerSubscriptionUpdated = async ({
  stripeSubscription,
}: {
  stripeSubscription: Stripe.Subscription;
}) => {
  const subscription = await fetchUserSubscription(stripeSubscription.id);
  if (!subscription.userId) throw new Error('No user ID in subscription');

  const datePeriodEnd = stripeSubscription.status === 'active'
    ? new Date(stripeSubscription.current_period_end * 1000)
    : null;

  await updateUserSubscription(subscription.userId, {
    subscriptionStatus: stripeSubscription.status,
    subscriptionPlan: stripeSubscription.items.data[0]?.price.id,
    stripeCurrentPeriodEnd: datePeriodEnd,
  });
};

The webhook handlers cover: customer.subscription.created, customer.subscription.updated, customer.subscription.deleted, checkout.session.completed, and invoice.payment_failed. This covers the full subscription lifecycle without custom implementation.

The Admin Panel

The admin dashboard is the most complete of any free boilerplate:

// src/admin/UsersDashboardPage.tsx
export default function UsersDashboard() {
  const users = useQuery(getUsers);

  return (
    <AdminLayout>
      <DashboardMetrics>
        <MetricCard title="Total Users" value={users.data?.count} />
        <MetricCard title="Paid Users" value={users.data?.paidCount} />
        <MetricCard title="MRR" value={users.data?.mrr} prefix="$" />
        <MetricCard title="Churn Rate" value={users.data?.churnRate} suffix="%" />
      </DashboardMetrics>

      <UsersTable
        users={users.data?.users}
        onTogglePayingStatus={handleTogglePayingStatus}
        onDeleteUser={handleDeleteUser}
      />
    </AdminLayout>
  );
}

Users table, MRR/ARR metrics, toggle subscription status, delete users — customer support-ready on day one. Paid alternatives ShipFast and Next SaaS Starter don't include an admin panel; Open SaaS does.

Getting Started

# Install Wasp CLI
curl -sSL https://get.wasp-lang.dev/installer.sh | sh

# Create project from Open SaaS template
wasp new my-saas -t saas
cd my-saas

# Configure environment
cp .env.server.example .env.server
# Add: DATABASE_URL, WASP_WEB_CLIENT_URL, STRIPE_KEY,
#      STRIPE_WEBHOOK_SECRET, SENDGRID_API_KEY, GOOGLE_CLIENT_ID/SECRET

# Start development (runs React dev server + Node.js server)
wasp start

The Wasp CLI starts both the client (React at :3000) and server (Node.js at :3001) concurrently with hot reload. The initial setup requires a running PostgreSQL database — Neon's free tier works, or run Postgres locally via Docker.

The Blog (Astro-Powered)

Open SaaS separates the blog into a standalone Astro site:

open-saas/
├── app/         ← Wasp app (dashboard, auth, billing)
└── blog/        ← Astro blog (marketing, SEO content)

This is architecturally clean. The blog is served as static HTML with excellent Core Web Vitals and no JavaScript framework overhead. The main app has dynamic server rendering. Different deployment targets: blog → Netlify/GitHub Pages, app → Fly.io.

The Astro blog also provides a place to build SEO content that drives acquisition — a landing page with fast Core Web Vitals converts better than a Next.js page with a 200KB JavaScript payload.

OpenAI Integration

Open SaaS includes a working OpenAI integration for AI features:

// src/server/actions.ts — AI feature example
import OpenAI from 'openai';

const openai = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });

export const generateContent = async (
  args: { prompt: string; maxTokens: number },
  context: { user: User }
) => {
  // Check user has credits
  if (context.user.credits <= 0) {
    throw new Error('No credits remaining. Please upgrade your plan.');
  }

  const completion = await openai.chat.completions.create({
    model: 'gpt-4o',
    messages: [{ role: 'user', content: args.prompt }],
    max_tokens: args.maxTokens,
  });

  // Deduct credit
  await updateUserCredits(context.user.id, context.user.credits - 1);

  return completion.choices[0].message.content;
};

The credit system is pre-built — buy credits via Stripe, spend them on API calls. This is the standard AI SaaS monetization pattern.

The Wasp Trade-offs

Pros of Wasp

Reduced boilerplate: Wasp generates auth routes, API wiring, and background job setup from declarations. This is 2-3 days of setup work that disappears.

Full-stack type safety: Wasp's type system propagates types from server actions/queries to the React client automatically.

Built-in background jobs: The pg-boss queue integration means background tasks work out of the box without Redis setup.

Active YC-backed development: Wasp is Y Combinator-backed (W21) with 12k+ GitHub stars and an active community.

Cons of Wasp

Smaller ecosystem: Not all npm packages work in Wasp's server environment. Community resources are fewer than Next.js.

Learning curve: Understanding what Wasp generates vs what you write takes 1-2 days.

Non-standard deployment: Wasp apps deploy to Fly.io (recommended) rather than Vercel. The deployment story is slightly more complex.

Framework longevity risk: Wasp is newer than Next.js or Remix. Long-term maintenance is less certain.

Background Jobs in Practice

Wasp's built-in background job system is one of Open SaaS's most underrated features. Most SaaS apps need background processing (welcome emails, report generation, usage tracking), and the typical setup requires Redis + a job library like BullMQ. Wasp provides this out of the box via pg-boss (PostgreSQL-backed job queue):

// main.wasp — declare a background job
job sendWeeklyReport {
  executor: PgBoss.new,
  perform: {
    fn: import { generateAndSendReport } from "@src/jobs/weeklyReport"
  },
  schedule: {
    cron: "0 9 * * 1",  // Every Monday at 9am
    args: {}
  }
}

// src/jobs/weeklyReport.ts
export const generateAndSendReport = async (args: {}, context: any) => {
  const activeUsers = await context.entities.User.findMany({
    where: { lastActiveAt: { gte: subDays(new Date(), 7) } }
  });

  for (const user of activeUsers) {
    const stats = await getUserStats(user.id);
    await sendReportEmail(user.email, stats);
  }
};

No Redis setup, no separate worker process, no queue dashboard to maintain. The job runs in the same Node.js process, backed by a PostgreSQL table. For early-stage SaaS (under 1,000 active users), this is simpler and cheaper than Redis-based queues. For scale, you can migrate to BullMQ when the need arises.

File Storage with S3

Open SaaS includes AWS S3 integration for user file uploads — a feature most comparable free boilerplates omit:

// src/file-upload/actions.ts
import { s3Client, GetObjectCommand } from '../utils/s3Utils.js';
import type { File } from '@wasp/entities';

export const getDownloadFileSignedURL = async (
  { key }: { key: string },
  context: { user: { id: string } }
): Promise<string> => {
  const command = new GetObjectCommand({
    Bucket: process.env.AWS_S3_BUCKET!,
    Key: key,
  });
  return await getSignedUrl(s3Client, command, { expiresIn: 3600 });
};

The S3 integration provides pre-signed URLs for direct browser uploads (bypassing your server) and secure download links. This is the right pattern for SaaS file storage — your server generates the permissions, the browser talks directly to S3.

Open SaaS vs Next SaaS Starter

For developers choosing between Open SaaS and the free Next.js alternatives:

Factor	Open SaaS	Next SaaS Starter
Price	Free	Free
Admin panel	✅ Full	✅ Basic
AI integration	✅ OpenAI	❌
Framework	Wasp	Next.js
Community	Wasp Discord	GitHub + general
Deployment	Fly.io	Vercel

For developers who want standard Next.js tooling: Next SaaS Starter is the better fit. For developers who want the most features with minimal custom code: Open SaaS wins.

Final Verdict

Rating: 4/5

Open SaaS is an outstanding value — free, complete, and production-ready. Stripe billing, admin panel, AI integration, blog, and analytics together represent weeks of custom implementation that other boilerplates charge $149-$599 for. The Wasp trade-off is the only significant concern. If you evaluate Wasp and find it fits your workflow, Open SaaS is the best free SaaS boilerplate available in 2026.

---

Understanding Wasp: The Bet You're Making

Open SaaS is built on Wasp, a full-stack framework that compiles to React + Node.js. Understanding what this means practically is essential before committing.

What Wasp abstracts away: Full-stack operations (database queries, auth, API routes) are defined in .wasp configuration files rather than written as Node.js server code. Wasp generates the boilerplate server code, TypeScript types, and React hooks from these declarations. The result is significantly less code for common patterns.

The compilation model: wasp start compiles your .wasp declarations and your React/TypeScript code into a full-stack application. The .wasp-work directory contains the generated code you don't touch. This is conceptually similar to how Next.js compiles your code, but at a higher level of abstraction.

The practical trade-off: When something works in Wasp, it works well. When you need to do something Wasp doesn't support yet, you need to understand both the Wasp model and the underlying generated code. For standard SaaS features — auth, billing, CRUD operations, email — Wasp covers everything Open SaaS needs. For advanced requirements, expect to dig into the Wasp documentation and potentially the generated code.

The Wasp team is actively developing the framework. Missing features or integration gaps that exist today may be resolved by the time you're reading this — check the Wasp documentation and GitHub for the current state before making a final decision.

Open SaaS Deployment: Fly.io and the Node.js Stack

Open SaaS deploys to Fly.io by default, which reflects Wasp's deployment model. Unlike Next.js projects that deploy to Vercel with zero configuration, Open SaaS's Node.js server needs a persistent runtime. Fly.io provides this at a competitive price ($5-10/month for a starter app).

The deployment process is documented in Open SaaS's official guide: fly launch provisions the infrastructure, fly deploy pushes updates, and fly secrets set manages environment variables. The experience is comparable to Heroku in simplicity. For developers who have only deployed to Vercel, the shift to container-based deployment on Fly.io has a small learning curve — plan a half-day to get comfortable with the workflow.

PostgreSQL on Fly.io or Neon works well with Open SaaS's Prisma setup. The connection string, DATABASE_URL, goes into Fly.io secrets alongside the Stripe and OpenAI keys. Migrations run via wasp db migrate-deploy during the build step.

The separate server deployment (frontend + backend as one service on Fly.io) is simpler operationally than running two services. Open SaaS avoids the split-deployment complexity that some boilerplates introduce by separating the API from the frontend.

For teams evaluating Open SaaS: the fact that it's free means the evaluation cost is zero. Clone the repository, run wasp start, and spend an hour clicking through the admin panel, the billing flow, and the AI integration before committing. The Wasp learning curve is apparent within the first hour — either it fits your mental model or it doesn't. That discovery is worth making before choosing between Open SaaS and a paid alternative like ShipFast.

---

Browse all best open source SaaS boilerplates — Open SaaS alongside T3 Stack, Epic Stack, and every other MIT-licensed option, ranked and filterable in the StarterPick directory.

Compare Open SaaS with alternatives in our best open-source SaaS boilerplates guide.

See our guide to free open-source SaaS boilerplates — T3 Stack, Next SaaS Starter, and Epic Stack are the main alternatives.

Review AI/LLM boilerplates — Open SaaS's OpenAI integration is the best free starting point for AI SaaS. For broader context on the SaaS boilerplate market including paid options, see our best SaaS boilerplates guide.