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Web Development · head to head

Radix UI vs Spacelift

Radix UI logo

Radix UI

Web Development

Unstyled, accessible React component primitives

From
Free
Free plan
Yes
Full reviewWebsite
Spacelift logo

Spacelift

Developer Tools

Infrastructure-as-code orchestration for Terraform, OpenTofu, Pulumi and Kubernetes

From
Free
Free plan
Yes
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; Spacelift users are unlimited and private workers are metered, so deployment concurrency rather than headcount drives the bill, which inverts how most engineering budgets are built and is easy to under-forecast.
  • They diverge on capability: Radix UI covers Unstyled primitives, Spacelift covers Multi-tool orchestration.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Radix UI and Spacelift differ
AttributeRadix UISpacelift
Pricing modelOpen source, no licence feeBy private worker and tier, not by user
PlatformsWebWeb, Self-hosted, Cloud
CategoryWeb DevelopmentDeveloper Tools

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

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 Spacelift

  • Multi-tool orchestration
  • Policy as code
  • Private workers
  • Spaces
  • Blueprints
  • Drift detection

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 Spacelift
  • Replacing hand-built dropdowns and dialogs that have accessibility bugsnot Spacelift
  • Teams with a designer whose output should not be constrained by a library’s themenot Spacelift

Spacelift

  • Platform teams running infrastructure changes through approval gates rather than through application CInot Radix UI
  • Organisations standardising Terraform and OpenTofu across many teams with policy enforcementnot Radix UI
  • Estates needing private runners so cloud credentials never leave the networknot Radix UI
  • Teams wanting drift detection and reconciliation rather than plan-time checks alonenot 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

Spacelift

  • Users are unlimited and private workers are metered, so deployment concurrency rather than headcount drives the bill, which inverts how most engineering budgets are built and is easy to under-forecast.
  • There is no affordable paid entry point. The free tier stops at two users and the next tier is a five-figure commitment with nothing in between.
  • Three of the five tiers are quote-only, so a shortlist cannot be costed without entering a sales process with each vendor on it.
  • The self-hosted build lags the hosted one, has no public worker pool and lacks the Azure and Google Cloud integrations available in the SaaS product, with OIDC federation offered as the workaround.
  • Stacks, Rego policies, Blueprints, Spaces and Spacelift-managed state are proprietary constructs, so leaving means rebuilding the orchestration layer rather than pointing it at a different runner.

Pricing, plan by plan

Radix UI

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

Spacelift

Free
  • FreeFree
    • Two users
    • Public workers only
    • No private workers
  • Starter Plus$undefined/year
    • Unlimited users
    • Two public workers
    • One to two private workers
  • Business$undefined/year
    • Unlimited users
    • Three private workers
    • Quoted
  • Enterprise$undefined/year
    • Unlimited users
    • Five to thirty private workers
    • Self-hosted option

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 Spacelift if

  • You need multi-tool orchestration.
  • You want to start without paying.
  • You work on Web, Self-hosted, Cloud.
  • You also want policy as code.
Spacelift review

Questions people ask

Is Radix UI or Spacelift better?
Neither clearly leads. Radix UI starts at Free and Spacelift at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Radix UI or Spacelift?
Radix UI starts at Free and Spacelift at Free.
Does Radix UI or Spacelift run on more platforms?
Radix UI runs on Web. Spacelift runs on Web, Self-hosted, Cloud.
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 Spacelift is typically brought in for.
What can Radix UI do that Spacelift cannot?
Radix UI covers Unstyled primitives, Accessibility built in, Composable API, Controlled or uncontrolled. Spacelift covers Multi-tool orchestration, Policy as code, Private workers, Spaces.

Answered from the vendors’ own pages

Radix UI: Is Radix UI free?

Yes, open source under the MIT licence.

Spacelift: How is Spacelift priced?

By tier and by private worker count rather than per user. Users are unlimited on every paid plan. The published figure on the pricing page carries no period label, and the FAQ describes the tier as an annual subscription, so confirm the period in writing.

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.

Spacelift: Does it support OpenTofu?

Yes, and Spacelift sponsors the OpenTofu project, which is a substantive hedge for anyone avoiding Terraform under the Business Source Licence.

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.

Spacelift: Is there a self-hosted version?

Yes, described as carrying Enterprise functionality, but it is priced on request and lags the hosted product on cloud integrations.

Spacelift: Why not just use the CI system we already have?

That is the real comparison. General purpose CI handles state, drift, approval gates and concurrency control for infrastructure poorly, and whether that is worth a five-figure floor depends on how much infrastructure change your organisation actually ships.

Spacelift: What happens to our pipelines if we leave?

They do not port. Rego policies, Blueprints, Spaces and managed state are Spacelift constructs and the orchestration has to be rebuilt elsewhere.

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