When you're building a startup, how do you decide which technology is worth paying for?

One thing I've been learning while building a software company is that choosing a technology stack isn't just a technical decision. It's also a financial one.

There are tools for hosting, databases, authentication, analytics, testing, security, and AI development. Many have free tiers that make it possible to get started without significant upfront costs.

But as a product grows, those choices can introduce unexpected expenses, limitations, or migration challenges.

I've been thinking more carefully about the difference between choosing the cheapest option today and choosing something the business can realistically maintain as it grows.

For founders who've already navigated this, what technology decision did you make early that saved you money or prevented major problems later?

And was there anything you initially chose because it was inexpensive that eventually became more costly to maintain or replace?