Legal · head to head
Didomi vs Westlaw
Didomi
Legal
Google-certified and IAB TCF consent management across web, mobile and connected TV
- From
- On request
- Rated
- -
Westlaw
Legal
Thomson Reuters legal research platform, priced per seat with tiers from Edge to Advantage and negotiated enterprise contracts above 10 attorneys
- From
- On request
- Rated
- -
The short version
- Each has a real cost: Didomi pricing is based on monthly unique visitors and is not published, so a large publisher cannot estimate cost before entering a sales process, and traffic spikes translate directly into billing surprises.; Westlaw firms of 11 or more attorneys, which is most firms actually spending serious money on Westlaw, get no published price at all and negotiate blind against a sales team that sees every prior deal.
- They diverge on capability: Didomi covers Google CMP certification, Westlaw covers Case law and statute database.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Didomi and Westlaw actually diverge.
Identical on both: starting price (On request), pricing model (quote), free tier (No), user rating (Not yet rated), category (Legal).
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 Didomi
- Google CMP certification
- IAB TCF support
- Connected TV and OTT
- Mobile SDKs
- Consent proof storage
- Preference centre
- Consent analytics
- Global privacy regimes
Only in Westlaw
- Case law and statute database
- KeyCite
- Practical Law
- CoCounsel Legal
- Litigation analytics
- West Key Number System
What people use each for
The jobs each tool is most often brought in to do.
Didomi
- A European publisher whose Google Ad Manager revenue is withheld without a Google-certified CMP integrated with Consent Modenot Westlaw
- A broadcaster collecting consent on connected TV apps, where certified CMP options are very limitednot Westlaw
- A multinational advertiser needing one consent signal honoured consistently across web, iOS and Android propertiesnot Westlaw
- A group that must produce consent evidence to a data protection authority following a complaintnot Westlaw
Westlaw
- A solo attorney or small firm wanting published, self-service pricing rather than a sales negotiationnot Didomi
- A firm evaluating whether Practical Law and secondary sources justify moving from Edge to Advantagenot Didomi
- A litigation team wanting KeyCite and litigation analytics in the same research platformnot Didomi
- A firm that previously used Casetext and needs to understand that it must now buy CoCounsel Legal inside Westlaw insteadnot Didomi
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Didomi
- Pricing is based on monthly unique visitors and is not published, so a large publisher cannot estimate cost before entering a sales process, and traffic spikes translate directly into billing surprises.
- Consent banners depress measurable traffic by design, and Didomi cannot prevent that, so publishers moving from a non-compliant banner should expect an immediate drop in tracked users and attributable conversions.
- Certification is a moving target: Google and IAB update requirements periodically and each version change forces integration work on your side, not only on the vendor's.
- Connected TV consent collection depends on the app platform and remote control interface, and implementations are considerably more involved than a web banner, often requiring per-platform development.
- The wider privacy suite beyond consent is thinner than dedicated privacy platforms, so an organisation needing data subject rights automation and data mapping usually buys a second vendor anyway.
Westlaw
- Firms of 11 or more attorneys, which is most firms actually spending serious money on Westlaw, get no published price at all and negotiate blind against a sales team that sees every prior deal.
- Casetext no longer exists as an independent, cheaper self-serve product; anyone who liked its pricing and simplicity now has to buy into the Westlaw ecosystem, typically at a higher, seat-based cost.
- Multi-year contracts are structurally rewarded with the biggest discounts, which pressures firms into 2 or 3 year commitments before they know if usage will justify the tier chosen.
- Content and features vary meaningfully between Edge and Advantage, so an apparently small monthly price difference can hide the absence of Practical Law, which many firms end up needing anyway.
- Switching away from Westlaw means retraining staff on Lexis search syntax and the Key Number System has no direct Lexis equivalent, which is a genuine cost that suppresses competitive shopping at renewal.
Pricing, plan by plan
Didomi
On request- Didomi CMP$undefined/year
- Google-certified CMP for web, mobile and CTV
- IAB TCF registered
- Consent proof storage and analytics
Westlaw
On request- Westlaw Edge (solo and small firm, up to 10 attorneys)$undefined/month
- Single-circuit coverage from roughly $107 to $155 a month
- All-states-plus-federal coverage roughly $266 a month
- 2-year contracts around 12% off list, 3-year around 18% off
- Westlaw Advantage (firms of 11+ attorneys)$undefined/year
- Bundles Practical Law and secondary sources
- No published price, quote via sales representative
- CoCounsel Legal available as a seat add-on, reported around $639 per seat per month
Which should you pick?
Choose Didomi if
- You need google cmp certification.
- You work on Web, iOS, Android, Connected TV, API.
- You also want iab tcf support.
Choose Westlaw if
- You need case law and statute database.
- You work on Web, iOS, Android.
- You also want keycite.
Questions people ask
- Is Didomi or Westlaw better?
- Neither clearly leads. Didomi starts at On request and Westlaw at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Didomi or Westlaw?
- Didomi starts at On request and Westlaw at On request.
- Does Didomi or Westlaw run on more platforms?
- Didomi runs on Web, iOS, Android, Connected TV, API. Westlaw runs on Web, iOS, Android.
- What is Didomi best used for?
- Didomi is most often used for a european publisher whose google ad manager revenue is withheld without a google-certified cmp integrated with consent mode, a broadcaster collecting consent on connected tv apps, where certified cmp options are very limited, a multinational advertiser needing one consent signal honoured consistently across web, ios and android properties, a group that must produce consent evidence to a data protection authority following a complaint. Of those, a european publisher whose google ad manager revenue is withheld without a google-certified cmp integrated with consent mode and a broadcaster collecting consent on connected tv apps, where certified cmp options are very limited are not what Westlaw is typically brought in for.
- What can Didomi do that Westlaw cannot?
- Didomi covers Google CMP certification, IAB TCF support, Connected TV and OTT, Mobile SDKs. Westlaw covers Case law and statute database, KeyCite, Practical Law, CoCounsel Legal.
Answered from the vendors’ own pages
Didomi: Is Didomi Google-certified?
Yes, for web, mobile and connected TV, and the certification has been renewed across multiple years.
Westlaw: Can I still buy Casetext?
No. Casetext was retired on 1 April 2025. Its AI functionality continues as CoCounsel Legal, sold only as part of the Westlaw ecosystem.
Didomi: Does it support IAB TCF?
Yes, it is a registered TCF CMP, currently supporting version 2.2 and later revisions.
Westlaw: Why does Westlaw publish some prices but not others?
Self-service online pricing exists only for solo practitioners and firms up to 10 attorneys; larger firms are routed to a sales representative with no public rate.
Didomi: What does it cost?
Not published. Pricing is based on monthly unique visitors and quoted.
Westlaw: What does CoCounsel Legal cost on top of Westlaw?
Reported figures put it around $639 per seat per month as an add-on, though this is not an official published rate and varies by contract.
Didomi: Where is consent data stored?
Didomi is a French company and offers European storage, which matters for procurement teams weighing supervisory jurisdiction.
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