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.

Square vs Stripe: Which is Better in 2026?

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Payment Gateway

Choosing between Square and Stripe? 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.

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

Stripe is for: Developers who want card and wallet payments through an API, with billing, tax and a merchant-of-record option from the same company.

Quick verdict

There’s no single winner; pick on your constraint. Choose Square if you take most payments in person. Choose Stripe if you want to build checkout and billing through an API.

Square vs Stripe — Side by Side

	Square	Stripe
Category	Payment Gateway	Payment Gateway
What it is	Payments and point of sale	Payments platform
Merchant of record	No	No by default; yes with Managed Payments (+3.5%)
Online card fee	3.3% + 30¢ on Free; 2.9% + 30¢ on Plus and Premium	2.9% + 30¢ (US)
Monthly fee	$0, $49 or $149 per location	None
Built for	In-person and online sellers	Online businesses of any size
Pricing	From $49/mo	Usage-based
Starting price	From $49/mo	Pay-as-you-go
Free tier	—	—
Best for	Payment Gateway — in-person, POS, small business	Payment Gateway — payments API, developers, global cards

Pros & Cons

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

Stripe

Cards, ACH and wallets through one API
No setup or monthly fees
Merchant of record available through Managed Payments

You handle sales tax unless you add Managed Payments (+3.5%)
International cards and currency conversion add fees
$15 per dispute

Key Features Compared

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¢

Stripe

US cards and wallets: 2.9% + 30¢ per successful transaction; +0.5% manually entered, +1.5% international, +1% currency conversion
ACH Direct Debit: 0.8%; Billing: 0.8% of billing volume
Disputes: $15 per dispute
No setup or monthly fees on standard pricing
Managed Payments: Stripe becomes merchant of record for 3.5% on top of standard processing fees

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

Choose Stripe if…

You want to build checkout and billing through an API.
You want to handle tax yourself now and add a merchant of record later.
You want cards, ACH and wallets from one account.

Stripe review & pricing

Frequently Asked Questions

Is Square better than Stripe?⌄

There’s no single winner; pick on your constraint. Choose Square if you take most payments in person. Choose Stripe if you want to build checkout and billing through an API.

What is the difference between Square and Stripe?⌄

What it is — Square: Payments and point of sale. Stripe: Payments platform. Merchant of record — Square: No. Stripe: No by default; yes with Managed Payments (+3.5%). Online card fee — Square: 3.3% + 30¢ on Free; 2.9% + 30¢ on Plus and Premium. Stripe: 2.9% + 30¢ (US). Monthly fee — Square: $0, $49 or $149 per location. Stripe: None. Built for — Square: In-person and online sellers. Stripe: Online businesses of any size.

Square vs Stripe: which is cheaper?⌄

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

When should I skip both Square and Stripe?⌄

Skip Square if you sell mostly online through an API. Stripe charges 2.9% + 30¢ with no plan fee. Skip Stripe if you want a merchant of record from day one at one flat rate. Paddle and Polar charge 5% + 50¢ with tax included.

Sources · tool facts checked November 2026