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.

Payment Gateway

Polar vs Razorpay: Which is Better in 2026?

Name: App Stack Builder
Availability: InStock

Choosing between Polar and Razorpay? 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.

Quick verdict

Both Polar and Razorpay are strong payment gateway choices. The right pick comes down to your specific feature needs, existing stack, and team preferences.

Polar vs Razorpay — Side by Side

	Polar	Razorpay
Category	Payment Gateway	Payment Gateway
Pricing	Free · paid from $20/mo	Free
Starting price	Free tier available	Free tier available
Free tier
Best for	Payment Gateway — merchant-of-record, saas	Payment Gateway — gateway, india

Pros & Cons

Polar

Merchant of record (offloads tax/VAT)
Great developer experience
Built for SaaS & digital goods
Open-source friendly

Free plan fee matches Paddle/Lemon (5%+50¢)
Younger than Stripe/Paddle

Razorpay

Best-in-class for India/UPI
No monthly fee
Rich payment methods
Good developer docs

Gateway, not merchant of record
India-focused
You handle tax compliance

Choose Polar if…

you want a free tier to start, and Polar Developer-first merchant of record for SaaS and digital products — handles global tax, billing, and entitlements.

Polar review & pricing

Choose Razorpay if…

you want a free tier to start, and Razorpay Leading Indian payment gateway for accepting payments online — UPI, cards, wallets, and subscriptions.

Razorpay review & pricing

Frequently Asked Questions

Is Polar better than Razorpay?⌄

Both Polar and Razorpay are strong payment gateway choices. The right pick comes down to your specific feature needs, existing stack, and team preferences.

What is the difference between Polar and Razorpay?⌄

Polar — Developer-first merchant of record for SaaS and digital products — handles global tax, billing, and entitlements. Razorpay — Leading Indian payment gateway for accepting payments online — UPI, cards, wallets, and subscriptions. Both are payment gateway tools; the comparison table above breaks down pricing, free tiers, and what each is best for.

Polar vs Razorpay: which is cheaper?⌄

Polar pricing: Free · paid from $20/mo. Razorpay pricing: Free. Confirm current pricing on each tool's official site, as plans change.

See more options in our guide to the best payment gateway tools for startups.

Still not sure which to pick?

Get a free, AI-powered tech stack — including the best payment gateway pick for your budget and team — in 60 seconds.

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