What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

Notifications & RealtimeFree tier

Courier: Pricing, Features & Alternatives

Courier's distinguishing idea is the template studio: designers edit notification content visually, across every channel, without a deploy. Routing rules decide which channel a given user gets and in what order, with automatic fallback. Pricing is the simplest in the category and also the least bounded — $0.005 per send with no flat tier above the free 10,000, so cost tracks volume exactly.

Courier Pricing Plans (2026)

Plan	Price	Highlights
Developer	$0	10,000 sends / month · All channels · Template studio
BusinessPopular	$0.005 per send	Unlimited sends · Advanced routing and fallback · Usage-based, no flat fee
Enterprise	Custom	Volume pricing · Dedicated support

Pricing summary: Free · then usage-based. Always confirm current pricing on the official site.

Key Courier Features

Unlimited sends
Advanced routing and fallback
Usage-based, no flat fee

Pros

+Visual template studio across all channels
+Automatic channel fallback routing
+Pay exactly for what you send
+Very generous free tier

Cons

−No flat tier makes budgeting harder
−Per-send cost is high at volume
−No self-hosted option

Best Courier Alternatives

Compare all

Knock

Free · paid from $250/mo

Novu

Free · paid from $30/mo

MagicBell

Free · paid from $249/mo

Courier Compared

Courier vs Knock Courier vs Novu Courier vs Ably Courier vs OneSignal Courier vs MagicBell Courier vs Pusher Channels

Courier FAQ

What is Courier used for?⌄

Courier is a notifications & realtime tool. Notification API and template studio that routes one send across email, SMS, push and chat, priced per send.

Is Courier free?⌄

Yes — Courier has a free tier you can start with, and paid plans for more usage and features.

How much does Courier cost?⌄

Courier is free to use, with usage-based pricing on some features.

What are the best Courier alternatives?⌄

Popular Courier alternatives include Knock, Novu, MagicBell. Compare pricing and features on our Courier alternatives page.