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.

Fly.io vs Hetzner Cloud: Which is Better in 2026?

Name: App Stack Builder
Availability: InStock

Hosting

Choosing between Fly.io and Hetzner Cloud? Both are popular hosting tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Fly.io is for: Developers who want to run containers in many regions near their users and are comfortable working from a CLI.

Hetzner Cloud is for: Developers comfortable running their own Linux servers who want cheap VPS capacity in Europe, the US or Singapore.

Quick verdict

There’s no single winner; pick on your constraint. Choose Fly.io if your users are spread across continents and latency matters. Choose Hetzner Cloud if you can run Linux servers yourself and want low monthly costs.

Fly.io vs Hetzner Cloud — Side by Side

	Fly.io	Hetzner Cloud
Category	Hosting	Hosting
What it is	Global container platform	Cloud VPS provider
How you pay	Per second while machines run	Fixed monthly price per server
Free access	$1 trial; invoices under $5 waived	None
What it runs	Any Docker image; managed Postgres	Linux VMs; load balancers, volumes, object storage
Who runs the servers	Managed hardware; you configure machines and regions	You run the servers
Pricing	Usage-based	From $7/mo
Starting price	Pay-as-you-go	From $7/mo
Free tier	—	—
Rating	4.7	4.6
Best for	Hosting — multi-region, Docker, low latency	Hosting — VPS, self-hosting, EU servers

Pros & Cons

Fly.io

True global, multi-region deployments
Excellent latency for global users
Transparent usage-based pricing
Strong Postgres and networking story
Developer-centric tooling

Steeper learning curve than Vercel/Render
No traditional UI-first workflow
Costs require monitoring at scale

Hetzner Cloud

Unbeatable price-performance
Generous RAM/CPU for the money
Hourly billing
Now has US regions

Raw VPS — you manage the stack
No managed PaaS layer
Fewer managed services than AWS/Azure
Several 2026 price increases

Key Features Compared

Fly.io

Machines billed per second while running; the smallest is $2.19 a month in US East
17 regions, priced by a regional multiplier
Managed Postgres from $38 a month
Egress from $0.02 per GB in North America and Europe
$1 free trial with no card; invoices under $5 are waived
Paid support from $29 a month

Hetzner Cloud

Cost-Optimized servers from €5.99 a month, Regular Performance from €6.49
General Purpose servers with dedicated vCPUs from €43.49 a month
Locations in Germany, Finland, Singapore and the US (Oregon and Virginia)
Load balancers, free stateful firewalls and S3-compatible object storage
Prices exclude VAT

Choose Fly.io if…

Your users are spread across continents and latency matters.
You want to run any Docker image, not just a supported runtime.
Your app is small, so a monthly bill under $5 is waived.

Fly.io review & pricing

Choose Hetzner Cloud if…

You can run Linux servers yourself and want low monthly costs.
You self-host tools such as Coolify, databases or n8n.
Your users are in Europe and you want EU-based servers.

Hetzner Cloud review & pricing

Frequently Asked Questions

Is Fly.io better than Hetzner Cloud?⌄

What is the difference between Fly.io and Hetzner Cloud?⌄

What it is — Fly.io: Global container platform. Hetzner Cloud: Cloud VPS provider. How you pay — Fly.io: Per second while machines run. Hetzner Cloud: Fixed monthly price per server. Free access — Fly.io: $1 trial; invoices under $5 waived. Hetzner Cloud: None. What it runs — Fly.io: Any Docker image; managed Postgres. Hetzner Cloud: Linux VMs; load balancers, volumes, object storage. Who runs the servers — Fly.io: Managed hardware; you configure machines and regions. Hetzner Cloud: You run the servers.

Fly.io vs Hetzner Cloud: which is cheaper?⌄

Fly.io pricing: Usage-based. Hetzner Cloud pricing: From $7/mo. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, Fly.io or Hetzner Cloud?⌄

In our catalog, Fly.io rates 4.7 out of 5 and Hetzner Cloud rates 4.6 out of 5, so Fly.io has a slight edge on reviews.

When should I skip both Fly.io and Hetzner Cloud?⌄

Skip Fly.io if you prefer a dashboard to a CLI. Render and Railway are UI-first. Skip Hetzner Cloud if you don’t want to manage servers. Render, Railway and Vercel are fully managed.

Sources · tool facts checked November 2026