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Legal · head to head

DISCO vs Spellbook

DISCO logo

DISCO

Legal

Cloud e-discovery priced by data volume, with review, legal hold and case preparation in one platform

From
On request
Rated
-
Full reviewWebsite
Spellbook logo

Spellbook

Legal

Contract drafting and review assistant inside Microsoft Word

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: DISCO per-gigabyte pricing that is attractive on a 200 gigabyte matter becomes the dominant line item on multi-terabyte collections, and the only cost lever left is aggressive culling before upload.; 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: DISCO covers All-in per-gigabyte pricing, 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 DISCO and Spellbook actually diverge.

Attributes where DISCO and Spellbook differ
AttributeDISCOSpellbook
PlatformsWebWindows, 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 DISCO

  • All-in per-gigabyte pricing
  • Cecilia AI
  • Technology assisted review
  • Legal hold
  • Case Builder
  • Self-service ingestion

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.

DISCO

  • A litigation team that needs a matter budget approved before the volume of collected data is fully knownnot Spellbook
  • A firm that wants unlimited reviewer accounts without paying per seat during a document review surgenot Spellbook
  • An in-house legal department consolidating legal hold and review with one vendor instead of twonot Spellbook
  • A case where speed of ingestion matters more than the analytics depth of an enterprise review platformnot Spellbook

Spellbook

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

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

DISCO

  • Per-gigabyte pricing that is attractive on a 200 gigabyte matter becomes the dominant line item on multi-terabyte collections, and the only cost lever left is aggressive culling before upload.
  • Hosting is cloud only in United States regions, so matters with European, United Kingdom or Australian data residency requirements are excluded outright.
  • Review analytics, scripting and the third-party application ecosystem remain deeper on Relativity, which matters for firms with established review workflows.
  • As a listed company reporting losses, it has been through leadership change including the founder departure in 2023, so multi-year roadmap commitments carry more risk than with a private vendor.
  • Complex productions and unusual data types still require professional services, so the promise of self-service holds mainly for mainstream email and document collections.

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

DISCO

On request
  • DISCO Ediscovery$undefined/year
    • Quoted per gigabyte of hosted data per month with unlimited users
    • Annual commitments and volume tiers negotiated for firms with steady caseloads
    • Legal hold, Case Builder and AI features priced as separate modules

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 DISCO if

  • You need all-in per-gigabyte pricing.
  • You also want cecilia ai.
DISCO 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 DISCO or Spellbook better?
Neither clearly leads. DISCO 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, DISCO or Spellbook?
DISCO starts at On request and Spellbook at On request.
Does DISCO or Spellbook run on more platforms?
DISCO runs on Web. Spellbook runs on Windows, macOS, Web.
What is DISCO best used for?
DISCO is most often used for a litigation team that needs a matter budget approved before the volume of collected data is fully known, a firm that wants unlimited reviewer accounts without paying per seat during a document review surge, an in-house legal department consolidating legal hold and review with one vendor instead of two, a case where speed of ingestion matters more than the analytics depth of an enterprise review platform. Of those, a litigation team that needs a matter budget approved before the volume of collected data is fully known and a firm that wants unlimited reviewer accounts without paying per seat during a document review surge are not what Spellbook is typically brought in for.
What can DISCO do that Spellbook cannot?
DISCO covers All-in per-gigabyte pricing, Cecilia AI, Technology assisted review, Legal hold. Spellbook covers Word add-in drafting, Contract review, Benchmarks against market standards, Question answering.

Answered from the vendors’ own pages

DISCO: How is DISCO priced?

Per gigabyte of hosted data per month, all-in, with unlimited users. There is no published rate card, so it is quoted.

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.

DISCO: Can data be hosted outside the United States?

Coverage is centred on United States cloud regions, so confirm residency before shortlisting for European or Australian matters.

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.

DISCO: Is it cheaper than Relativity?

On small and mid-sized matters usually yes, because seats and analytics are included. On very large collections the volume charge often overtakes a negotiated Relativity arrangement.

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.

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