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.

Paddle vs Square: Which is Better in 2026?

Name: App Stack Builder
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Payment Gateway

Choosing between Paddle and Square? Both are popular payment gateway tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Paddle is for: SaaS and software companies who want a merchant of record to handle sales tax, VAT, fraud and buyer support.

Square is for: Shops, restaurants and service businesses taking card payments in person and online, with POS hardware.

Quick verdict

There’s no single winner; pick on your constraint. Choose Paddle if you sell software globally and don’t want to register for VAT and sales tax. Choose Square if you take most payments in person.

Paddle vs Square — Side by Side

	Paddle	Square
Category	Payment Gateway	Payment Gateway
What it is	Payments and billing platform	Payments and point of sale
Merchant of record	Yes	No
Online card fee	5% + 50¢, tax handling included	3.3% + 30¢ on Free; 2.9% + 30¢ on Plus and Premium
Monthly fee	None	$0, $49 or $149 per location
Built for	SaaS and software	In-person and online sellers
Pricing	Usage-based	From $49/mo
Starting price	Pay-as-you-go	From $49/mo
Free tier	—	—
Best for	Payment Gateway — merchant of record, SaaS, global tax	Payment Gateway — in-person, POS, small business

Pros & Cons

Paddle

Merchant of record: collects and files sales tax for you
Fraud, chargebacks and buyer support included
No monthly or migration fees

5% + 50¢ costs more per sale than a plain gateway
Products under $10 need custom pricing
Custom rates only through sales

Square

Great for in-person + online
No monthly base fee
Hardware ecosystem
Easy setup

Free plan online rate is 3.3% + 30¢
Less developer-centric

Key Features Compared

Paddle

Pay-as-you-go: 5% + 50¢ per checkout transaction
Merchant of record: collects the right tax rate and files sales tax returns for you
Payments, checkout, subscriptions and billing in one platform; fraud, chargebacks and buyer support included
No monthly, migration or hidden fees; no lock-in period
Custom pricing for high volume; contact Paddle for products under $10

Square

Square Free: $0 a month; 2.6% + 15¢ in person, 3.3% + 30¢ online and invoices
Square Plus: $49 a month per location; 2.5% + 15¢ in person, 2.9% + 30¢ online
Square Premium: $149 a month per location; 2.4% + 15¢ in person, 2.9% + 30¢ online
Manually entered or card-on-file payments: 3.5% + 15¢

Choose Paddle if…

You sell software globally and don’t want to register for VAT and sales tax.
You want chargebacks and buyer support handled for you.
You want subscriptions and checkout from the same vendor.

Paddle review & pricing

Choose Square if…

You take most payments in person.
You want POS hardware and online payments on one account.
You want to start without a monthly fee.

Square review & pricing

Frequently Asked Questions

Is Paddle better than Square?⌄

There’s no single winner; pick on your constraint. Choose Paddle if you sell software globally and don’t want to register for VAT and sales tax. Choose Square if you take most payments in person.

What is the difference between Paddle and Square?⌄

What it is — Paddle: Payments and billing platform. Square: Payments and point of sale. Merchant of record — Paddle: Yes. Square: No. Online card fee — Paddle: 5% + 50¢, tax handling included. Square: 3.3% + 30¢ on Free; 2.9% + 30¢ on Plus and Premium. Monthly fee — Paddle: None. Square: $0, $49 or $149 per location. Built for — Paddle: SaaS and software. Square: In-person and online sellers.

Paddle vs Square: which is cheaper?⌄

Paddle pricing: Usage-based. Square pricing: From $49/mo. Confirm current pricing on each tool's official site, as plans change.

When should I skip both Paddle and Square?⌄

Skip Paddle if you want a lower per-transaction rate as a merchant of record. Polar’s paid plans start at 3.8% + 40¢. Skip Square if you sell mostly online through an API. Stripe charges 2.9% + 30¢ with no plan fee.

Sources · tool facts checked November 2026