Developer Tools · head to head
ESLint vs Osano
Osano
Cybersecurity
Consent management and data privacy platform with a published self-serve tier
- From
- Free
- Free plan
- Yes
The short version
- Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Osano the published visitor ceilings are low, with the paid self-serve tier stopping around 30,000 monthly visitors, so any consumer facing site with real traffic leaves published pricing immediately and negotiates a quote with no public anchor.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which ESLint and Osano actually diverge.
Identical on both: starting price (Free), free tier (Yes), 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 Osano does not also cover.
Only in Osano
- Consent banner
- Pre-consent tag blocking
- Consent record
- No fines guarantee
- Subject rights requests
- Data mapping
- Vendor privacy monitoring
- Cookie scanning
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 Osano
- Automatically fixing issues with syntax-aware rewritesnot Osano
- Enforcing a consistent code style across a teamnot Osano
- Running as a CI step to block non-conforming codenot Osano
- Writing custom rules for project-specific conventionsnot Osano
Osano
- A mid market company selling into the EU and California that needs one banner honouring different consent rules by visitor regionnot ESLint
- A privacy counsel who wants a vendor that will contractually stand behind its consent product rather than disclaim all liabilitynot ESLint
- A marketing team that needs Google Consent Mode signals wired correctly so analytics and ads degrade rather than break when consent is refusednot ESLint
- A company with a handful of brand domains wanting one consent record and one scanning schedule across all of themnot 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
Osano
- The published visitor ceilings are low, with the paid self-serve tier stopping around 30,000 monthly visitors, so any consumer facing site with real traffic leaves published pricing immediately and negotiates a quote with no public anchor.
- The no fines guarantee is bounded and conditional on configuring the product as instructed, so it is a marketing differentiator with an indemnity cap rather than the insurance policy the name suggests, and the limits should be read before it influences a decision.
- Everything beyond consent, including subject rights automation, data mapping and vendor monitoring, is enterprise quoted, so the transparent pricing that attracts buyers covers only the cheapest part of the platform.
- Tag blocking depends on tags being loaded through the mechanisms Osano can intercept, and marketing teams that inject scripts directly into templates or through server side tagging routinely leak trackers past the banner without anyone noticing.
- It is a privacy platform rather than a security compliance one, so organisations that also need SOC 2 or ISO 27001 evidence collection run it alongside a separate tool and duplicate parts of the vendor and asset inventory.
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
Osano
Free- FreeFree
- 1 user
- 1 domain
- 5,000 monthly visitors
- Plus$199/month
- 2 users
- 3 domains
- 30,000 monthly visitors
- Enterprise$undefined/year
- Unlimited domains and higher visitor volumes
- Subject rights request automation
- Data mapping and assessments
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 Osano if
- You need consent banner.
- You want to start without paying.
- You also want pre-consent tag blocking.
Questions people ask
- Is ESLint or Osano better?
- Neither clearly leads. ESLint starts at Free and Osano at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or Osano?
- ESLint starts at Free and Osano at Free.
- Does ESLint or Osano run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Osano runs on Web.
- Can I use ESLint for free?
- Both have a free tier, so you can try either at no cost before committing.
- 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 Osano is typically brought in for.
- What can ESLint do that Osano cannot?
- Osano covers Consent banner, Pre-consent tag blocking, Consent record, No fines guarantee.
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.
SourceOsano: Does the free tier include the no fines guarantee?
No. The guarantee attaches to paid use of the consent product, and the free tier is capped at one domain and 5,000 monthly visitors.
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.
SourceOsano: How is Osano priced?
By monthly website visitors, number of domains and tier. The self-serve path stops at a low visitor ceiling and everything above is quoted.
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.
SourceOsano: Can it handle US state privacy laws as well as GDPR?
Yes, with region aware rule sets covering GDPR, ePrivacy and the US state regimes, so an EU visitor sees an opt-in banner and a US visitor sees the applicable opt-out.
Osano: Does Osano do subject access requests?
Yes, but in the enterprise tier rather than the published plans, and it is quoted separately from consent.
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