Developer Tools · head to head
ESLint vs Sardine
Sardine
Cybersecurity
Device intelligence and behaviour biometrics for fraud and compliance
- From
- On request
- 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; Sardine signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which ESLint and Sardine 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 ESLint
Nothing recorded that Sardine does not also cover.
Only in Sardine
- Device intelligence
- Behaviour biometrics
- Scam detection
- Onboarding risk scoring
- AML transaction monitoring
- Dispute and chargeback handling
- Rules editor
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 Sardine
- Automatically fixing issues with syntax-aware rewritesnot Sardine
- Enforcing a consistent code style across a teamnot Sardine
- Running as a CI step to block non-conforming codenot Sardine
- Writing custom rules for project-specific conventionsnot Sardine
Sardine
- A neobank losing money to authorised push payment scams where the customer genuinely approved the transfernot ESLint
- A crypto exchange trying to detect accounts being operated by remote access rather than by their ownernot ESLint
- A fintech seeing synthetic identity signups that pass document verification but share device characteristicsnot ESLint
- A lender wanting first party fraud signals at application time that a credit bureau file does not containnot 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
Sardine
- Signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.
- Behavioural and device telemetry collection needs a documented lawful basis under GDPR, and EU privacy reviews frequently delay rollouts that were scoped as engineering work.
- Pricing is per session or per active user, so a consumer product with many low value sessions pays in proportion to traffic rather than to fraud exposure.
- As a younger private company it lacks the enforcement-tested audit history that a bank examiner expects, which makes it a harder sell inside a regulated bank than inside a fintech.
- It is strongest on session-time signals and weaker as a system of record for long horizon AML typologies, so larger institutions end up running it alongside a traditional monitoring platform rather than instead of one.
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
Sardine
On request- Sardine$undefined/year
- Priced per user session or per monthly active user
- Annual contract with volume commitment
- SDK for web, iOS and Android
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 Sardine if
- You need device intelligence.
- You work on Web, iOS, Android.
- You also want behaviour biometrics.
Questions people ask
- Is ESLint or Sardine better?
- Neither clearly leads. ESLint starts at Free and Sardine at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or Sardine?
- ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and On request for Sardine.
- Does ESLint or Sardine run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Sardine runs on Web, iOS, Android.
- Can I use ESLint for free?
- Yes. ESLint has a free tier, so you can try it without paying. Sardine starts at On request.
- 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 Sardine is typically brought in for.
- What can ESLint do that Sardine cannot?
- Sardine covers Device intelligence, Behaviour biometrics, Scam detection, Onboarding risk 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.
SourceSardine: Does Sardine do document verification?
It focuses on device, behavioural and transaction signals, and integrates identity verification providers rather than being one. Treat it as complementary to a KYC vendor.
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.
SourceSardine: What does it need from us to work?
An SDK in your web and mobile applications plus transaction feeds. Without the client side collector you lose the signals that differentiate it.
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.
SourceSardine: Is pricing published?
No. It is quoted, typically per session or per monthly active user with an annual volume commitment.
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- Sardine vs Moonrepo
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- Sardine vs Pants Build
- Sardine vs Unit21
- Sardine vs Featurespace ARIC Risk Hub
- Sardine vs Feedzai
- Sardine vs NICE Actimize
- Sardine vs Socure
- Sardine vs ThetaRay
- Sardine vs Transmit Security
- Sardine vs Jumio
- Sardine vs iDenfy
- Sardine vs Silent Eight
- Sardine vs Sumsub
- Sardine vs Quantexa
- Sardine vs TunnelBear
- Sardine vs Vanta
- Sardine vs Acunetix
- Sardine vs Aikido
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