Developer Tools · head to head
Cortex vs SolidJS
Cortex
Developer Tools
Internal developer portal that scores service ownership and maturity rather than just cataloguing services
- From
- On request
- Free plan
- No
SolidJS
Web Development
Reactive JavaScript framework with no virtual DOM
- From
- Free
- Free plan
- Yes
The short version
- Only SolidJS has a free tier, so it costs nothing to try first.
- Each has a real cost: Cortex pricing is quote only, so a platform team cannot build a business case or compare against the true cost of self-hosted Backstage without entering a sales cycle first.; SolidJS much smaller ecosystem than React, so many problems have no off-the-shelf library
- They diverge on capability: Cortex covers Service catalogue, SolidJS covers No virtual DOM.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cortex and SolidJS actually diverge.
Identical on both: 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 Cortex
- Service catalogue
- Scorecards
- Initiatives
- Self-service templates
- Query language
- Eng intelligence
- Integrations layer
- On-call and ownership mapping
Only in SolidJS
- No virtual DOM
- Components run once
- JSX syntax
- Small bundles
What people use each for
The jobs each tool is most often brought in to do.
Cortex
- A platform team that needs to prove to leadership how far a Kubernetes or framework migration has actually progressed across hundreds of servicesnot SolidJS
- An organisation where ownership of production services is genuinely unknown after reorganisations or acquisitionsnot SolidJS
- Enforcing production readiness standards on new services at creation time rather than at incident reviewnot SolidJS
- Replacing a self-hosted Backstage that is consuming a full-time engineer or two just to stay upgradednot SolidJS
SolidJS
- Interfaces where update performance is the binding constraintnot Cortex
- Teams comfortable with React syntax who want finer-grained reactivitynot Cortex
- Applications where bundle size directly affects the businessnot Cortex
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Cortex
- Pricing is quote only, so a platform team cannot build a business case or compare against the true cost of self-hosted Backstage without entering a sales cycle first.
- The catalogue is only as accurate as the metadata you supply, so an organisation with inconsistent repository conventions spends its first quarter cleaning data before any scorecard means anything.
- Scorecards create political friction: publishing a per-team grade turns an engineering standard into a performance metric, and teams will game the rules rather than fix the underlying issue.
- It is closed source and hosted, so organisations with strict data residency or air-gap requirements have limited options compared with running Backstage themselves.
- Value scales with organisation size, so a company with fifty engineers and thirty services will find the catalogue tells them nothing they did not already know while still paying an enterprise contract.
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
Pricing, plan by plan
Cortex
On request- Cortex$undefined/year
- Service catalogue and ownership mapping
- Scorecards and initiatives
- Self-service templates
SolidJS
Free- SolidJSFree
- Full library
- Commercial use permitted
- No usage limits
Which should you pick?
Choose Cortex if
- You need service catalogue.
- You work on Web, API.
- You also want scorecards.
Choose SolidJS if
- You need no virtual dom.
- You want to start without paying.
- You also want components run once.
Questions people ask
- Is Cortex or SolidJS better?
- Neither clearly leads. Cortex starts at On request and SolidJS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cortex or SolidJS?
- SolidJS has a free tier; the other does not. Paid plans start at On request for Cortex and Free for SolidJS.
- Does Cortex or SolidJS run on more platforms?
- Cortex runs on Web, API. SolidJS runs on Web.
- Can I use SolidJS for free?
- Yes. SolidJS has a free tier, so you can try it without paying. Cortex starts at On request.
- What is Cortex best used for?
- Cortex is most often used for a platform team that needs to prove to leadership how far a kubernetes or framework migration has actually progressed across hundreds of services, an organisation where ownership of production services is genuinely unknown after reorganisations or acquisitions, enforcing production readiness standards on new services at creation time rather than at incident review, replacing a self-hosted backstage that is consuming a full-time engineer or two just to stay upgraded. Of those, a platform team that needs to prove to leadership how far a kubernetes or framework migration has actually progressed across hundreds of services and an organisation where ownership of production services is genuinely unknown after reorganisations or acquisitions are not what SolidJS is typically brought in for.
- What can Cortex do that SolidJS cannot?
- Cortex covers Service catalogue, Scorecards, Initiatives, Self-service templates. SolidJS covers No virtual DOM, Components run once, JSX syntax, Small bundles.
Answered from the vendors’ own pages
Cortex: How is Cortex different from Backstage?
Backstage is an open source framework you build and staff. Cortex is a hosted product with scorecards and initiatives out of the box and no platform team required to keep it running.
SolidJS: Is SolidJS free?
Yes, open source under the MIT licence.
Cortex: Is pricing published?
No. Cortex requires a sales conversation and prepares a custom proposal.
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.
Cortex: Can it self-host?
It is offered as a hosted product; on-premise arrangements are handled through sales rather than published.
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.
Cortex: What is the main adoption risk?
Bad or missing service metadata. The catalogue and every scorecard on top of it inherit whatever quality your repositories already have.
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