Developer Tools · head to head
ESLint vs Qualys VMDR
Qualys VMDR
Cybersecurity
Cloud-delivered vulnerability management licensed per asset, using scanner appliances and a lightweight agent.
- From
- $3/month
- Free plan
- No
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; Qualys VMDR licensing is per asset and each capability is its own subscription, so patch management, endpoint detection, web application scanning, container security and policy compliance are separate line items, and the platform demonstrated in a proof of concept is rarely the platform in the quote.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which ESLint and Qualys VMDR actually diverge.
| Attribute | ESLint | Qualys VMDR |
|---|---|---|
| Starting price | Free | $3/month |
| Pricing model | Unknown | subscription |
| Free tier | Yes | No |
| Platforms | Browser-based JavaScript, Node.js, Any JavaScript environment | Web, Cloud, Api |
| Category | Developer Tools | Cybersecurity |
| Founded | 2019 | 1999 |
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 Qualys VMDR does not also cover.
Only in Qualys VMDR
- Cloud Agent
- Scanner appliances
- Authenticated scanning
- TruRisk scoring
- Asset inventory
- Patch Management
- Cloud connectors
- Container sensor
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 Qualys VMDR
- Automatically fixing issues with syntax-aware rewritesnot Qualys VMDR
- Enforcing a consistent code style across a teamnot Qualys VMDR
- Running as a CI step to block non-conforming codenot Qualys VMDR
- Writing custom rules for project-specific conventionsnot Qualys VMDR
Qualys VMDR
- A hybrid workforce where scheduled network scans miss most laptops and continuous agent-based assessment is the only way to get real coveragenot ESLint
- PCI DSS external scanning where an approved scanning vendor report is a contractual requirementnot ESLint
- An estate spanning datacentre, multiple public clouds and endpoints that needs one vulnerability view rather than three toolsnot ESLint
- Organisations replacing a manual patch-verification process with agent-reported evidence that a fix actually landednot 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
Qualys VMDR
- Licensing is per asset and each capability is its own subscription, so patch management, endpoint detection, web application scanning, container security and policy compliance are separate line items, and the platform demonstrated in a proof of concept is rarely the platform in the quote.
- Ephemeral cloud instances consume asset entitlement until they age out of inventory, so an autoscaling group that creates and destroys hosts hourly can burn licence capacity on machines that existed for minutes, and controlling that means tuning purge policies rather than tuning the cloud.
- Authenticated scanning produces materially better results than unauthenticated, but it requires storing and rotating privileged credentials for every target platform, which is a security project in its own right, and teams that skip it receive reports full of unconfirmed potential findings that nobody trusts.
- The console is a set of modules with separate interfaces, search syntaxes and report engines, so an analyst moving between vulnerability management, policy compliance and web application scanning learns each one, and cross-module reporting usually ends in a spreadsheet or a script against the API.
- The tool surfaces findings far faster than any organisation can remediate them, and it does not solve the ownership problem: without an agreed prioritisation policy and a named owner in IT operations, a first scan producing tens of thousands of findings becomes a dashboard that everyone learns to ignore.
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
Qualys VMDR
$3/month- VMDR$3/month
- Per asset
- Vulnerability scanning
- Detection
- VMDR+$5/month
- All VMDR features
- Advanced analytics
- Cloud integration
- VMDR Complete$7/month
- All VMDR+ features
- Threat intel
- Response automation
Which should you pick?
Choose ESLint if
- You want to start without paying.
- You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
Choose Qualys VMDR if
- You need cloud agent.
- You work on Web, Cloud, Api.
- You also want scanner appliances.
Questions people ask
- Is ESLint or Qualys VMDR better?
- Neither clearly leads. ESLint starts at Free and Qualys VMDR at $3/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or Qualys VMDR?
- ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and $3/month for Qualys VMDR.
- Does ESLint or Qualys VMDR run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Qualys VMDR runs on Web, Cloud, Api.
- Can I use ESLint for free?
- Yes. ESLint has a free tier, so you can try it without paying. Qualys VMDR starts at $3/month.
- 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 Qualys VMDR is typically brought in for.
- What can ESLint do that Qualys VMDR cannot?
- Qualys VMDR covers Cloud Agent, Scanner appliances, Authenticated scanning, TruRisk scoring.
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.
SourceQualys VMDR: Agent or scanner: which do I need?
Usually both. The agent covers endpoints and servers you control and gives continuous data; scanners cover devices you cannot install an agent on, such as network gear, printers and appliances, and provide the external perimeter view.
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.
SourceQualys VMDR: Does it patch as well as detect?
Yes, through the Patch Management module, which is a separate subscription using the same agent. Core VMDR detects and prioritises but does not deploy fixes.
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.
SourceQualys VMDR: How are assets counted for licensing?
By the number of assets in inventory, which includes cloud instances and containers depending on the modules in use. Short-lived cloud assets count until they are purged, so purge settings directly affect what you consume.
Qualys VMDR: Can I keep the data in a specific region?
Yes. Qualys operates several regional platform instances and you choose which one your subscription lives on. Moving between them later is not trivial, so decide before onboarding.
Qualys VMDR: Does it scan web applications?
Web Application Scanning is a separate module licensed per application, not part of core VMDR, and it is a dynamic scanner with the usual limits around authenticated flows in single-page applications.
Related pages
More on Qualys VMDR
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