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Web Development · head to head

HTMX vs Radix UI

HTMX logo

HTMX

Web Development

Lightweight JavaScript library enabling AJAX, WebSockets, and server-sent events in HTML

From
Free
Rated
-
Full reviewWebsite
Radix UI logo

Radix UI

Web Development

Unstyled, accessible React component primitives

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: HTMX best suited for server-rendered architectures, not pure client-side SPAs; Radix UI you write all the styling, so time to a finished interface is much longer than with a styled library
  • They diverge on capability: HTMX covers AJAX requests, Radix UI covers Unstyled primitives.

Where they differ

Only the attributes on which HTMX and Radix UI actually diverge.

Attributes where HTMX and Radix UI differ
AttributeHTMXRadix UI
Pricing modelopen-sourceOpen source, no licence fee

Identical on both: starting price (Free), free tier (Yes), platforms (Web), user rating (Not yet rated), category (Web Development).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in HTMX

  • AJAX requests
  • HTTP verb support
  • DOM targeting
  • Swap strategies
  • WebSocket support
  • Server-sent events
  • Out-of-band updates

Only in Radix UI

  • Unstyled primitives
  • Accessibility built in
  • Composable API
  • Controlled or uncontrolled

What people use each for

The jobs each tool is most often brought in to do.

HTMX

  • Building interactive applications without JavaScript framework complexitynot Radix UI
  • Server-rendered applications requiring dynamic updatesnot Radix UI
  • Adding interactivity to existing server-side applicationsnot Radix UI
  • Hypermedia-driven applications using HTML-first approachesnot Radix UI

Radix UI

  • Design systems that need correct accessibility without inherited visual opinionsnot HTMX
  • Replacing hand-built dropdowns and dialogs that have accessibility bugsnot HTMX
  • Teams with a designer whose output should not be constrained by a library’s themenot HTMX

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

HTMX

  • Best suited for server-rendered architectures, not pure client-side SPAs
  • Limited client-side state management capabilities compared to frameworks
  • Smaller ecosystem with fewer third-party libraries and tools
  • Learning curve for developers from JavaScript framework backgrounds

Radix UI

  • You write all the styling, so time to a finished interface is much longer than with a styled library
  • Composable part-based APIs are more verbose than a single component with props
  • Covers primitives rather than complex widgets, so data grids and date pickers come from elsewhere

Pricing, plan by plan

HTMX

Free

No published plan breakdown. See the HTMX review.

Radix UI

Free
  • Radix UIFree
    • Full functionality
    • Commercial use permitted
    • Community support

Which should you pick?

Choose HTMX if

  • You need ajax requests.
  • You want to start without paying.
  • You also want http verb support.
HTMX review

Choose Radix UI if

  • You need unstyled primitives.
  • You want to start without paying.
  • You also want accessibility built in.
Radix UI review

Questions people ask

Is HTMX or Radix UI better?
Neither clearly leads. HTMX starts at Free and Radix UI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, HTMX or Radix UI?
HTMX starts at Free and Radix UI at Free.
Does HTMX or Radix UI run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use HTMX for free?
Both have a free tier, so you can try either at no cost before committing.
What is HTMX best used for?
HTMX is most often used for building interactive applications without javascript framework complexity, server-rendered applications requiring dynamic updates, adding interactivity to existing server-side applications, hypermedia-driven applications using html-first approaches. Of those, building interactive applications without javascript framework complexity and server-rendered applications requiring dynamic updates are not what Radix UI is typically brought in for.
What can HTMX do that Radix UI cannot?
HTMX covers AJAX requests, HTTP verb support, DOM targeting, Swap strategies. Radix UI covers Unstyled primitives, Accessibility built in, Composable API, Controlled or uncontrolled.

Answered from the vendors’ own pages

HTMX: How big is the HTMX JavaScript library?

HTMX is only 16 kilobytes minified and gzipped with zero external dependencies.

Source
Radix UI: Is Radix UI free?

Yes, open source under the MIT licence.

HTMX: Can HTMX work with JSON APIs?

While HTMX is optimized for HTML responses, it can work with JSON through additional configuration and response handling.

Source
Radix UI: Why use unstyled components?

Because accessibility is the hard part and visual design is the part teams want to own. Radix gives the first and stays out of the second.

HTMX: Does HTMX support real-time features like WebSockets?

Yes, HTMX includes support for WebSockets and server-sent events for real-time bidirectional communication.

Source
Radix UI: What is the relationship with shadcn/ui?

shadcn/ui is built on Radix primitives, adding Tailwind styling and copy-paste distribution on top.

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