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Developer Tools · head to head

ESLint vs Zscaler Internet Access

ESLint logo

ESLint

Developer Tools

Find and fix problems in JavaScript code

From
Free
Free plan
Yes
Full reviewWebsite
Zscaler Internet Access logo

Zscaler Internet Access

Cybersecurity

Secure cloud-native internet and SaaS access

From
$100/year
Free plan
No
Full reviewWebsite

The short version

  • Only ESLint has a free tier, so it costs nothing to try first.
  • Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Zscaler Internet Access the pricing page names two base tiers, Essentials Platform and Zscaler Platform, plus modular add ons including three Digital Experience Monitoring tiers, but publishes no dollar figures anywhere and routes buyers to a demo request for cost
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which ESLint and Zscaler Internet Access actually diverge.

Attributes where ESLint and Zscaler Internet Access differ
AttributeESLintZscaler Internet Access
Starting priceFree$100/year
Pricing modelUnknownsubscription
Free tierYesNo
PlatformsBrowser-based JavaScript, Node.js, Any JavaScript environmentWeb, Desktop, Mobile
CategoryDeveloper ToolsCybersecurity
Founded20192007

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 ESLint

Nothing recorded that Zscaler Internet Access does not also cover.

Only in Zscaler Internet Access

  • Secure web gateway
  • Cloud firewall
  • URL filtering
  • Advanced threat protection
  • Data loss prevention
  • Cloud sandbox
  • Browser isolation
  • CASB

What people use each for

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

ESLint

  • Statically analysing JavaScript and JSX to find problems before runtimenot Zscaler Internet Access
  • Automatically fixing issues with syntax-aware rewritesnot Zscaler Internet Access
  • Enforcing a consistent code style across a teamnot Zscaler Internet Access
  • Running as a CI step to block non-conforming codenot Zscaler Internet Access
  • Writing custom rules for project-specific conventionsnot Zscaler Internet Access

Zscaler Internet Access

  • Cloud Securitynot ESLint
  • Zero Trustnot ESLint
  • Web Securitynot ESLint

Where each one falls short

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

ESLint

  • Slow performance on large codebases compared to newer tools like Oxlint and Biome
  • Complexity in configuration from scratch, particularly for TypeScript support
  • Limited built-in TypeScript support, requiring separate parsers and coordination with new TypeScript features

Zscaler Internet Access

  • The pricing page names two base tiers, Essentials Platform and Zscaler Platform, plus modular add ons including three Digital Experience Monitoring tiers, but publishes no dollar figures anywhere and routes buyers to a demo request for cost

Pricing, plan by plan

ESLint

Free

No published plan breakdown. See the ESLint review.

Zscaler Internet Access

$100/year
  • ZIA Business$100/year
    • Web security
    • URL filtering
    • Cloud firewall
  • ZIA Transformation$200/year
    • All Business features
    • Advanced threat protection
    • Cloud sandbox
  • ZIA Unlimited$350/year
    • All Transformation features
    • Cloud browser isolation
    • CASB

Which should you pick?

Choose ESLint if

  • You want to start without paying.
  • You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
ESLint review

Choose Zscaler Internet Access if

  • You need secure web gateway.
  • You work on Web, Desktop, Mobile.
  • You also want cloud firewall.
Zscaler Internet Access review

Questions people ask

Is ESLint or Zscaler Internet Access better?
Neither clearly leads. ESLint starts at Free and Zscaler Internet Access at $100/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESLint or Zscaler Internet Access?
ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and $100/year for Zscaler Internet Access.
Does ESLint or Zscaler Internet Access run on more platforms?
ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Zscaler Internet Access runs on Web, Desktop, Mobile.
Can I use ESLint for free?
Yes. ESLint has a free tier, so you can try it without paying. Zscaler Internet Access starts at $100/year.
What is ESLint best used for?
ESLint is most often used for statically analysing javascript and jsx to find problems before runtime, automatically fixing issues with syntax-aware rewrites, enforcing a consistent code style across a team, running as a ci step to block non-conforming code. Of those, statically analysing javascript and jsx to find problems before runtime and automatically fixing issues with syntax-aware rewrites are not what Zscaler Internet Access is typically brought in for.
What can ESLint do that Zscaler Internet Access cannot?
Zscaler Internet Access covers Secure web gateway, Cloud firewall, URL filtering, Advanced threat protection.

Answered from the vendors’ own pages

ESLint: Does ESLint automatically fix code issues?

Many problems ESLint finds can be automatically fixed via the --fix flag. ESLint fixes are syntax-aware so you won't experience errors introduced by traditional find-and-replace algorithms.

Source
Zscaler Internet Access: How many pricing tiers does Zscaler Internet Access offer?

Zscaler Internet Access offers two main platform bundles: the Essentials Platform (entry-level) and the Zscaler Platform (comprehensive). Specific pricing is not published online.

Source
ESLint: How much does ESLint cost?

ESLint is completely free and open-source software maintained by the OpenJS Foundation. The project accepts voluntary donations from sponsors.

Source
Zscaler Internet Access: Are there optional add-on modules available?

Yes. Zscaler offers extensive optional capabilities in five categories including Inline Cyberthreat Protection, Private Access enhancements, Data Security, Security Operations, and Zero Trust Branch.

Source
ESLint: Can I write custom ESLint rules?

Yes. You can develop custom rules that work alongside built-in functionality through ESLint's plugin system, allowing complete customization for your project needs.

Source
Zscaler Internet Access: How is Zscaler Zero Trust Branch priced?

Zero Trust Branch is sized by encrypted throughput (200 Mbps to 10 Gbps) or endpoint count (200 to 5,000 endpoints), with pricing varying by configuration.

Source
Zscaler Internet Access: How do I get Zscaler pricing?

Zscaler does not publish pricing online. You must request a demo or contact their sales team to receive a pricing quote.

Source
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