SPA vs MPA: Single-Page vs Multi-Page Applications
Basics4 minInnovialabs editorial team
In short
An MPA loads a new HTML page on every navigation and is simpler for SEO and content sites; an SPA loads once and swaps screens on the client, which suits complex apps. Today most projects choose a hybrid.
The short answer
- MPA (multi-page application) — every navigation loads a new HTML page from the server. Classic websites, online stores, blogs, media.
- SPA (single-page application) — the browser loads the app once, then JavaScript swaps screens and fetches data through an API. Email clients, CRMs, dashboards, editors.
If the site mostly shows content and search traffic matters, lean towards MPA. If users spend a long time working inside the interface, lean towards SPA. For most new projects the sensible answer is a hybrid, covered below.
How navigation works
MPA: a click on a link, the browser requests a new page, the server returns ready HTML, the page is redrawn entirely. Simple and reliable; the back button and links just work.
SPA: a client-side router intercepts the click, updates the URL via the History API, requests data (usually JSON) and re-renders only the part that changed. Transitions feel instant, but routing, loading states, errors and scroll restoration have to be handled in code.
Comparison by key criteria
| Criterion | MPA | SPA |
|---|---|---|
| First load | fast, HTML right away | slower, JS must load and run |
| Subsequent navigation | full page reload | fast, no reload |
| SEO | naturally good | needs SSR or prerendering |
| Development complexity | lower | higher: routing, state, API |
| State between screens | lost on navigation | kept in memory |
| Offline mode | limited | possible via Service Worker |
| Device load | low | higher on low-end phones |
| Analytics | works out of the box | virtual page views must be tracked |
Performance
An MPA wins on the first screen: the browser gets ready HTML and can show it immediately. That matters for pages people reach from search and ads.
An SPA wins over long sessions: once the app is loaded, navigation only needs data. But a large JavaScript bundle slows down startup, especially on budget devices and slow connections. Code splitting and lazy-loaded screens help.
SEO
Search engines work best with ready HTML. An MPA has it by default.
A classic SPA serves almost empty HTML and fills it with JavaScript. Search engines can execute JS, but it is slower and less predictable. That is why public SPA pages are usually backed by SSR (server-side rendering) or prerendering.
Offline mode
An SPA already holds the whole interface in the browser, so with a Service Worker it is easier to turn into a PWA that opens without a network and syncs data later. Offline is possible for an MPA too — pages can be cached — but there is less interactivity without the server.
Hybrids: the line is blurring
Modern tools combine the strengths of both:
- Next.js, Nuxt, SvelteKit, Remix — the first load works like an MPA (HTML from the server), after that navigation works like an SPA.
- Astro — a multi-page site with interactive "islands".
- htmx, Hotwire Turbo — an MPA where navigation and partial updates happen without a full reload.
- The browser View Transitions API enables smooth animations between regular MPA pages.
So today the question is not "SPA or MPA" but where you need server HTML and where you need client-side interactivity.
How to choose
- Where do users come from? From search — you need server HTML.
- How long is a session? Minutes inside one interface favour SPA behaviour.
- Is offline needed? If yes — SPA or PWA.
- What is the team? Backend developers will ship an MPA faster; a frontend team, an SPA or hybrid.
- Is there a private area? Often the public site is an MPA and the user account area is an SPA.
Common mistakes
- Building an SPA for a landing page or blog and then fighting SEO problems.
- Not tracking navigation in SPA analytics.
- Shipping a huge bundle instead of splitting code.
- Breaking the back button and deep links in an SPA.