Does it need to rank?
If real people find you through Google or AI search, you need server rendered HTML. That points to Next.js.
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Next.js
In short: React is a UI library. Next.js is a framework built on React that adds routing, server rendering, static generation and SEO out of the box. For most production web apps and SaaS where search visibility matters, choose Next.js. Use plain React only for tools behind a login where SEO is irrelevant.
Short answer first. React is a UI library for building interfaces, and Next.js is a full framework built on top of React that adds routing, server rendering, static generation and SEO out of the box. For nearly every production SaaS or marketing site, especially when search visibility matters, choose Next.js. Reach for plain React only when the entire product lives behind a login and SEO is irrelevant.
React renders in the browser by default. The user downloads a JavaScript bundle, the browser runs it, and only then does content appear. That is great for app like experiences but weak for search engines, which often see a near empty page. Next.js renders on the server or at build time and sends complete HTML, so crawlers and AI agents read your content immediately and users see a meaningful page sooner.
| Dimension | Plain React | Next.js |
|---|---|---|
| What it is | UI library | Framework built on React |
| Rendering | Client side by default | Server side, static and client, your choice per route |
| SEO | Weak without extra setup | Strong, full HTML for crawlers |
| First load performance | Depends heavily on bundle size | Fast, HTML streamed and edge cached |
| Routing | Add a library yourself | Built in file based routing |
| Data and APIs | Wire up separately | Server components and API routes included |
| Best for | Internal tools behind a login | SaaS, marketing sites, anything that must rank |
Search ranking and conversion both reward pages that are fast and stable. Google measures this with Core Web Vitals, and the green thresholds are clear targets. Next.js makes hitting them the easy path because the server does the heavy lifting before the browser ever starts.
LCP target (good)
INP target (good)
CLS target (good)
A client only React app has to ship and execute its bundle before content paints, which pushes LCP up and risks layout shift as data loads in. Next.js sends ready HTML, hydrates only the interactive parts, and edge caches the result, so the same product hits green vitals with far less hand tuning.
If real people find you through Google or AI search, you need server rendered HTML. That points to Next.js.
Marketing and SaaS landing pages live or die on speed. Next.js edge caching gives you fast first loads with little effort.
A pure internal dashboard with no public pages gains little from SEO. Plain React is a fair choice there.
Routing, data fetching and API routes ship with Next.js. With plain React you assemble and maintain that stack yourself.
Our default in 2026
For client work we start with Next.js unless there is a concrete reason not to. It covers the common cases, scales cleanly, and you can still drop into raw React for any view that needs it. Picking plain React first and adding rendering later tends to cost more than starting with the framework.
European B2B software is a crowded, fast moving market where being found and loading fast directly shapes pipeline. A Next.js foundation gives SaaS teams indexable pages, quick mobile loads and room to scale, which is why we treat it as the sensible starting point rather than an upgrade you bolt on later.
Talk to senior engineers who have shipped both. compliance aware, transparent pricing, no junior handoffs.
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In 2026, expect to budget roughly $15k for a simple internal tool, €28k to €75k for an MVP, $80k to $200k for a SaaS platform, and $200k or more for an enterprise build. The real number tracks scope, integrations, engineer seniority, and compliance, not whichever Europe vendor gives you the vaguest quote.
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