Is Didomi or Spellbook better?

Neither clearly leads. Didomi starts at On request and Spellbook at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Didomi or Spellbook?

Didomi starts at On request and Spellbook at On request.

Does Didomi or Spellbook run on more platforms?

Didomi runs on Web, iOS, Android, Connected TV, API. Spellbook runs on Windows, macOS, Web.

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 Spellbook is typically brought in for.

What can Didomi do that Spellbook cannot?

Didomi covers Google CMP certification, IAB TCF support, Connected TV and OTT, Mobile SDKs. Spellbook covers Word add-in drafting, Contract review, Benchmarks against market standards, Question answering.

Legal · head to head

Didomi vs Spellbook

Didomi

Legal

Google-certified and IAB TCF consent management across web, mobile and connected TV

From: On request
Rated: -

Full review Website

Spellbook

Legal

Contract drafting and review assistant inside Microsoft Word

From: On request
Rated: -

Full review Website

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.; Spellbook it publishes no accuracy figure for its own output and no independent evaluation exists, so a firm must run its own assessment on real agreements.
They diverge on capability: Didomi covers Google CMP certification, Spellbook covers Word add-in drafting.
Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Didomi and Spellbook actually diverge.

Attributes where Didomi and Spellbook differ
Attribute	Didomi	Spellbook
Platforms	Web, iOS, Android, Connected TV, API	Windows, macOS, Web

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 Spellbook

Word add-in drafting
Contract review
Benchmarks against market standards
Question answering
Named model providers

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 Spellbook
A broadcaster collecting consent on connected TV apps, where certified CMP options are very limitednot Spellbook
A multinational advertiser needing one consent signal honoured consistently across web, iOS and Android propertiesnot Spellbook
A group that must produce consent evidence to a data protection authority following a complaintnot Spellbook

Spellbook

Transactional lawyers drafting commercial agreements in Wordnot Didomi
In-house teams reviewing inbound contracts without a contract lifecycle systemnot Didomi
Lawyers who want a first pass at redlines before applying their own judgementnot Didomi
Firms that need to know which model providers process their documents before adopting an AI toolnot 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.

Spellbook

It publishes no accuracy figure for its own output and no independent evaluation exists, so a firm must run its own assessment on real agreements.
The ten times more accurate claim originated in a funding announcement as a statement of intent and has no methodology, dataset or baseline behind it.
Contract text is processed by third-party model providers, so despite the zero data retention agreements this still needs checking against client confidentiality terms and outside counsel guidelines.
Pricing is not published, so seat cost cannot be compared against competitors without booking a demo.
It is a drafting assistant rather than a contract lifecycle system, so it does nothing for execution, obligation tracking or renewals.

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

Spellbook

On request

Spellbook$undefined/year
- Priced by the number of seats on the licence
- Rates quoted after a demo, not published
- Seven day free trial, free access for academic use

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.

Didomi review

Choose Spellbook if

You need word add-in drafting.
You work on Windows, macOS, Web.
You also want contract review.

Spellbook review

Questions people ask

Is Didomi or Spellbook better?: Neither clearly leads. Didomi starts at On request and Spellbook at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Didomi or Spellbook?: Didomi starts at On request and Spellbook at On request.
Does Didomi or Spellbook run on more platforms?: Didomi runs on Web, iOS, Android, Connected TV, API. Spellbook runs on Windows, macOS, Web.
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 Spellbook is typically brought in for.
What can Didomi do that Spellbook cannot?: Didomi covers Google CMP certification, IAB TCF support, Connected TV and OTT, Mobile SDKs. Spellbook covers Word add-in drafting, Contract review, Benchmarks against market standards, Question answering.

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.

Spellbook: Is Spellbook's accuracy independently verified?

No. It publishes no accuracy figure of its own, and no third-party evaluation has been published. It did not participate in the Vals Legal AI Report, the main independent lawyer-baselined benchmark. Evaluate it on your own agreements during the trial.

Didomi: Does it support IAB TCF?

Yes, it is a registered TCF CMP, currently supporting version 2.2 and later revisions.

Spellbook: Which models does it use and where does our text go?

Spellbook names OpenAI GPT-5 and Anthropic Claude models, and states it has zero data retention agreements with both providers. Confirm the current terms and subprocessor list against your client confidentiality obligations before use.

Didomi: What does it cost?

Not published. Pricing is based on monthly unique visitors and quoted.

Spellbook: What does it cost?

Pricing is per seat but is not published. The vendor quotes it after a demo, so the seat rate cannot be compared with competitors in advance.

Didomi: Where is consent data stored?

Didomi is a French company and offers European storage, which matters for procurement teams weighing supervisory jurisdiction.

Didomi vs Spellbook

Didomi

Spellbook

The short version

Where they differ

What each one covers

Only in Didomi

Only in Spellbook

What people use each for

Didomi

Spellbook

Where each one falls short

Didomi

Spellbook

Pricing, plan by plan

Didomi

Spellbook

Which should you pick?

Choose Didomi if

Choose Spellbook if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Didomi

More on Spellbook

Keep looking

Other head to heads