Why I Chose SvelteKit Over Next.js

I’ve built production applications with both Next.js and SvelteKit. For Quantivo, we went with SvelteKit, and a year in I’m more convinced than ever it was the right call.

This isn’t a framework wars post. Next.js is great. But for what we’re building, a data heavy B2B SaaS with complex dashboards and a lot of real time financial data, SvelteKit has been the better fit.

Reactivity that makes sense

React’s mental model always felt backwards to me. You render everything, then diff, then figure out what actually changed. You end up wrapping things in useState, useMemo, useCallback, fighting stale closures, and writing more code to manage the framework than to solve your actual problem.

Svelte compiles reactivity away at build time. You write a variable, you change it, the UI updates. That’s it. With Svelte 5’s runes the system got even cleaner. State, derived values, and effects cover almost everything you need with essentially zero boilerplate.

The code reads like what it does. When you’re building dashboards with hundreds of data points that update frequently, that simplicity compounds fast.

Less framework, more product

SvelteKit ships significantly less JavaScript to the browser than Next.js. For a framework runtime we’re talking about a fraction of the size. That might not matter for a blog, but our clients are financial advisors who often work on tablets or laptops with mediocre connections while visiting their clients. Every kilobyte of overhead translates to real latency they can feel.

Beyond bundle size, the developer experience is just faster. File based routing that’s intuitive, layouts that compose naturally, data loading that has a clear convention. Everything has a place and there are very few surprises. The codebase stays readable as it grows, which matters a lot when you’re a small team moving fast.

The tradeoffs

SvelteKit isn’t perfect and I won’t pretend it is. The ecosystem is smaller than React’s. Finding developers who already know Svelte is harder. Some niche libraries only have React bindings. That’s it.

For a small team building a focused product, none of that has been a real blocker. We built a complete custom component library for Quantivo’s UI because we needed something tailored to our use case anyway. The ecosystem gap matters less when you’re building most of your interface from scratch.

Would I do it again

Without hesitation. We ship faster, debug less, and spend more time on the product than on fighting the framework. The learning curve from React to Svelte is gentler than people expect, and the productivity gains are real and immediate.

If you’re starting something new and your team is open to it, give SvelteKit a serious look.