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Web Development · head to head

Radix UI vs SolidStart

Radix UI logo

Radix UI

Web Development

Unstyled, accessible React component primitives

From
Free
Rated
-
Full reviewWebsite
SolidStart logo

SolidStart

Web Development

Full-stack meta-framework for SolidJS with fine-grained reactivity

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Radix UI you write all the styling, so time to a finished interface is much longer than with a styled library; SolidStart smaller ecosystem compared to Next.js or Remix due to relative newness
  • They diverge on capability: Radix UI covers Unstyled primitives, SolidStart covers Fine-grained reactivity.

Where they differ

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

Attributes where Radix UI and SolidStart differ
AttributeRadix UISolidStart
Pricing modelOpen source, no licence feeopen-source

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 Radix UI

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

Only in SolidStart

  • Fine-grained reactivity
  • Server actions
  • Single-flight mutations
  • Request deduplication
  • Multi-router support
  • Automatic API generation
  • Vite integration

What people use each for

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

Radix UI

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

SolidStart

  • Building lightweight full-stack applications with minimal runtime overheadnot Radix UI
  • Projects requiring fine-grained reactivity and automatic dependency trackingnot Radix UI
  • Applications targeting multiple deployment platforms with single codebasenot Radix UI
  • Teams prioritizing performance and small bundle sizesnot Radix UI

Where each one falls short

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

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

SolidStart

  • Smaller ecosystem compared to Next.js or Remix due to relative newness
  • SolidJS less familiar to developers with React experience
  • Community documentation not as extensive as larger frameworks
  • Limited third-party UI component libraries compared to React ecosystem

Pricing, plan by plan

Radix UI

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

SolidStart

Free

No published plan breakdown. See the SolidStart review.

Which should you pick?

Choose Radix UI if

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

Choose SolidStart if

  • You need fine-grained reactivity.
  • You want to start without paying.
  • You also want server actions.
SolidStart review

Questions people ask

Is Radix UI or SolidStart better?
Neither clearly leads. Radix UI starts at Free and SolidStart at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Radix UI or SolidStart?
Radix UI starts at Free and SolidStart at Free.
Does Radix UI or SolidStart run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Radix UI for free?
Both have a free tier, so you can try either at no cost before committing.
What is Radix UI best used for?
Radix UI is most often used for design systems that need correct accessibility without inherited visual opinions, replacing hand-built dropdowns and dialogs that have accessibility bugs, teams with a designer whose output should not be constrained by a library’s theme. Of those, design systems that need correct accessibility without inherited visual opinions and replacing hand-built dropdowns and dialogs that have accessibility bugs are not what SolidStart is typically brought in for.
What can Radix UI do that SolidStart cannot?
Radix UI covers Unstyled primitives, Accessibility built in, Composable API, Controlled or uncontrolled. SolidStart covers Fine-grained reactivity, Server actions, Single-flight mutations, Request deduplication.

Answered from the vendors’ own pages

Radix UI: Is Radix UI free?

Yes, open source under the MIT licence.

SolidStart: What is SolidJS and how does it differ from React?

SolidJS uses fine-grained reactivity and automatic dependency tracking instead of React's virtual DOM, resulting in smaller bundles and better performance.

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.

SolidStart: How many deployment platforms does SolidStart support?

SolidStart supports over 20 deployment platforms including Cloudflare, Netlify, Vercel, Deno, AWS, and Azure through Vite plugins.

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.

SolidStart: Can I use TanStack Router with SolidStart?

Yes, SolidStart supports using either the official Solid Router or TanStack Router depending on project requirements.

Source
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