Developer Tools · head to head
ESLint vs ThetaRay
ThetaRay
Cybersecurity
Unsupervised AI transaction monitoring for cross-border and correspondent banking
- 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; ThetaRay unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which ESLint and ThetaRay 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 ThetaRay does not also cover.
Only in ThetaRay
- Unsupervised detection
- Cross-border focus
- Sanctions screening
- Alert triage
- Customer risk scoring
- Cloud native
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 ThetaRay
- Automatically fixing issues with syntax-aware rewritesnot ThetaRay
- Enforcing a consistent code style across a teamnot ThetaRay
- Running as a CI step to block non-conforming codenot ThetaRay
- Writing custom rules for project-specific conventionsnot ThetaRay
ThetaRay
- A correspondent bank that cannot see the ultimate originator and needs behavioural signals rather than counterparty listsnot ESLint
- A cross-border payments fintech whose rules engine produces more alerts than its compliance team can clearnot ESLint
- A bank under a regulatory consent order needing demonstrable improvement in detection within a fixed periodnot ESLint
- A payment institution entering a high-risk corridor where existing thresholds were calibrated on domestic trafficnot 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
ThetaRay
- Unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
- The alert reduction claim depends heavily on your data, so a parallel run is essential and adds months and cost before you can decommission the incumbent.
- Coverage is strongest in cross-border and correspondent flows; institutions whose risk is domestic retail fraud will find the fit weaker than a general-purpose monitoring platform.
- It is a smaller vendor than the incumbents, so integration connectors into legacy core banking systems are often bespoke work rather than a supported adapter.
- Model retraining and tuning are vendor-led, which means changing detection behaviour is a support conversation rather than something your own analysts can do that afternoon.
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
ThetaRay
On request- ThetaRay Sonar$undefined/year
- Priced by monitored transaction volume and number of monitored entities
- SaaS on Azure with regional data residency options
- Parallel run and model tuning included in onboarding
Which should you pick?
Choose ESLint if
- You want to start without paying.
- You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
Questions people ask
- Is ESLint or ThetaRay better?
- Neither clearly leads. ESLint starts at Free and ThetaRay at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or ThetaRay?
- ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and On request for ThetaRay.
- Does ESLint or ThetaRay run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. ThetaRay runs on Web.
- Can I use ESLint for free?
- Yes. ESLint has a free tier, so you can try it without paying. ThetaRay 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 ThetaRay is typically brought in for.
- What can ESLint do that ThetaRay cannot?
- ThetaRay covers Unsupervised detection, Cross-border focus, Sanctions screening, Alert triage.
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.
SourceThetaRay: Does it replace a rules engine entirely?
Rarely on day one. Most institutions run it alongside existing rules during a parallel period, and some keep specific regulator-mandated rules permanently.
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.
SourceThetaRay: Where is the data processed?
SaaS runs on Microsoft Azure with regional deployment options, which is the mechanism for meeting data residency conditions in regulated markets.
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.
SourceThetaRay: Is sanctions screening included?
Screening is available on the same platform but licensed as part of the commercial package rather than bundled by default. Confirm it is in your quote.
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