DIY vs Nuxt Starter Kit — The Real Cost of Auth and Payments

“I can build that myself over a weekend” is the most expensive sentence in indie SaaS.

You can build auth and payments yourself. The question is what it costs in calendar time — and what you postpone while you do it.

What “DIY foundation” usually includes

For a Nuxt SaaS MVP that you would trust with real customers:

That is roughly 75–145 hours before your actual product logic.

At a conservative freelance rate of $100/hour, that is $7.5k–$14.5k of your time — not counting opportunity cost.

Where DIY estimates go wrong

People underestimate:

• Webhook retries and duplicate events
• Password reset abuse
• Session invalidation after password change
• Tax/MoR complexity for global sales
• “Temporary” folder structure that becomes permanent debt
• Upgrade work when Nuxt/auth/payment libs move

AI helps generate code. It does not remove the need for correct system design.

When DIY is the right call

Build from scratch if:

• Learning the full stack is the goal
• Your product’s core IP is the billing/auth model
• You need exotic constraints a kit cannot express
• You enjoy infrastructure more than product

Those are valid reasons. They are not the default for a solo founder validating a market.

When a starter kit is the right call

Buy a foundation if:

• You have shipped (or abandoned) the same auth/payment setup before
• You want to validate a product idea in weeks, not quarters
• You value an opinionated architecture you can still own and modify
• You would rather spend evenings on features users pay for

Honest comparison

The decision in one sentence

If foundation work delays your first paying user, DIY is probably the expensive option — even when the invoice is $0.

If you want the Nuxt 4 + better-auth + Polar path without rebuilding it, start with Nuxt Starter Kit and put your hours into the product only you can build.