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SolidJS vs Radix UI

SolidJS logo

SolidJS

Web Development

Reactive JavaScript framework with no virtual DOM

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: SolidJS much smaller ecosystem than React, so many problems have no off-the-shelf library; 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: SolidJS covers No virtual DOM, Radix UI covers Unstyled primitives.

Where they differ

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

Attributes where SolidJS and Radix UI differ
AttributeSolidJSRadix UI

Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 SolidJS

  • No virtual DOM
  • Components run once
  • JSX syntax
  • Small bundles

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.

SolidJS

  • Interfaces where update performance is the binding constraintnot Radix UI
  • Teams comfortable with React syntax who want finer-grained reactivitynot Radix UI
  • Applications where bundle size directly affects the businessnot Radix UI

Radix UI

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

Where each one falls short

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

SolidJS

  • Much smaller ecosystem than React, so many problems have no off-the-shelf library
  • The React-like syntax is misleading: components run once, and React habits produce subtle bugs
  • Smaller hiring pool and fewer learning resources than the mainstream frameworks

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

SolidJS

Free
  • SolidJSFree
    • Full library
    • Commercial use permitted
    • No usage limits

Radix UI

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

Which should you pick?

Choose SolidJS if

  • You need no virtual dom.
  • You want to start without paying.
  • You also want components run once.
SolidJS 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 SolidJS or Radix UI better?
Neither clearly leads. SolidJS 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, SolidJS or Radix UI?
SolidJS starts at Free and Radix UI at Free.
Does SolidJS or Radix UI run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use SolidJS for free?
Both have a free tier, so you can try either at no cost before committing.
What is SolidJS best used for?
SolidJS is most often used for interfaces where update performance is the binding constraint, teams comfortable with react syntax who want finer-grained reactivity, applications where bundle size directly affects the business. Of those, interfaces where update performance is the binding constraint and teams comfortable with react syntax who want finer-grained reactivity are not what Radix UI is typically brought in for.
What can SolidJS do that Radix UI cannot?
SolidJS covers No virtual DOM, Components run once, JSX syntax, Small bundles. Radix UI covers Unstyled primitives, Accessibility built in, Composable API, Controlled or uncontrolled.

Answered from the vendors’ own pages

SolidJS: Is SolidJS free?

Yes, open source under the MIT licence.

Radix UI: Is Radix UI free?

Yes, open source under the MIT licence.

SolidJS: Is SolidJS just React without the virtual DOM?

The syntax is similar but the model is not. Solid components run once and reactivity is fine-grained, so patterns that are correct in React can be wrong in Solid.

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.

SolidJS: Why is SolidJS fast?

It compiles away much of the framework and updates individual DOM nodes directly, rather than re-rendering components and diffing a virtual DOM.

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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