Build a SaaS in 2026
Tutorials, technical guides and lessons learned for shipping your SaaS with Next.js, tRPC and Prisma.
Steering Claude Code with CLAUDE.md on a Multi-Tenant SaaS
The real rules that govern this SaaS with Claude Code: what goes in CLAUDE.md, what doesn't, and what's actually shipped at purchase.
Electronic Invoicing 2026 for a B2B SaaS in France
Official timeline, PDP and e-reporting vocabulary, generating a Factur-X, and the role of a connector like iopole for a French B2B SaaS.
Testing Multi-Tenant Isolation in a SaaS
Twelve test families pulled from real code: IDOR, webhooks, rate limiting, sessions. What they prove, and what they don't.
Launching a SaaS Without Coding in 2026: The Hybrid No-Code + Code Stack
How to go from idea to a production SaaS without writing a line of Stripe or NextAuth code, using a builder that generates the code for you.
Mistral AI in a B2B SaaS: 5 Concrete TypeScript Use Cases
Integrating a European AI provider into your SaaS: data extraction, summaries, email classification, content generation, and semantic search.
Resend vs SendGrid vs Postmark: Which Email Service for Your SaaS?
An honest comparison of the three transactional email providers for a Next.js SaaS: DX, deliverability, pricing, and the choice HeartCo actually made.
GDPR for a French B2B SaaS: The Complete Checklist, No Myths
What you actually have to do to be GDPR-compliant as a French B2B SaaS, and what compliance agencies sell you that you don't need.
Rate Limiting in Next.js with Upstash Redis: Protect Your API in 10 Minutes
Implement production-ready rate limiting in Next.js and tRPC with serverless Upstash Redis. Patterns by route, by user, by organization.
Testing a Multi-Tenant SaaS: 7 Essential Vitest Patterns
From tenant isolation to RBAC permission checks, the test patterns that make a B2B SaaS genuinely reliable. With Vitest, tRPC, and Prisma.
CI/CD with GitHub Actions for a Next.js SaaS: One Workflow File, Explained
How a real Next.js SaaS pipeline works in GitHub Actions: affected-package Turbo filtering, cost-conscious PR-only triggers, and what gates every merge.
ShipFast vs HeartCo: Which SaaS Boilerplate Should You Choose in 2026?
A direct, honest comparison of ShipFast and HeartCo: stack, pricing, features, and which kind of project each one actually fits.
Multi-Tenant Isolation with Prisma and tRPC: What the Automatic Filter Covers, and What Doesn't
Isolate each organization's data in Next.js with Prisma $extends and tRPC: what the automatic filter covers, and what stays explicit.
Which Next.js SaaS Boilerplate Should You Pick in 2026? (Full Comparison)
ShipFast, MakerKit, SupaStarter, HeartCo: how to pick a Next.js SaaS boilerplate for your project, stack, and budget.
Deploying a Next.js SaaS to Production on Vercel: The Complete Checklist
From environment variable setup to post-deploy monitoring: everything to check before your SaaS is actually ready for production.
Integrating Stripe in a French SaaS: VAT, Invoices, Webhooks
A complete guide to integrating Stripe in a French B2B SaaS: VAT handling, compliant invoices, secured webhooks, and subscriptions.
tRPC v11: A Fully Type-Safe API Without Code Generation
Zero GraphQL schema, zero codegen, zero runtime overhead: how tRPC v11 changes the way you build APIs for Next.js SaaS products.
Multi-Tenant Authentication with NextAuth v5
Implement robust authentication with roles, granular permissions, and multi-tenant isolation for your SaaS, using NextAuth v5.
Tailwind CSS v4: Building a SaaS Design System in One Day
CSS tokens, dark mode, reusable components: how to structure a professional design system with Tailwind v4 and shadcn/ui.
Next.js 15 + tRPC + Prisma: The Winning Trio for Your SaaS
Step-by-step setup of the most productive technical trio for a SaaS in 2026: App Router, end-to-end type safety, and a modern ORM.
How to Build a SaaS in 2026: The Complete Guide
From idea to first customer: stack, multi-tenancy, payments, security, tests, and deployment for launching a B2B SaaS with Next.js.