M&A due diligence software: Marveri, Harvey, and Kira
Marveri is built for corporate and M&A attorneys, Harvey and Legora for the whole firm, and Kira for contract review at volume.
Which M&A due diligence software is right for your firm?
It depends on the bottleneck.
If you are standardizing a large firm on one AI platform
Harvey and Legora are built for that, and your deal teams can add Marveri alongside either.
If your bottleneck is tens of thousands of contracts
At that volume a dedicated extraction platform like Kira is the safer pick. Below it, Marveri covers the extraction and the deliverables too.
If you want the finished work product
Upload the transaction agreement and data room, and Marveri drafts cited diligence reports, disclosure schedule first drafts, and cap table tie-outs in Word.
How Marveri, Harvey, and Kira compare
Diligence reports
Cap table tie-outs
Request list responses
What each tool is built for
General-purpose legal AI platforms
Harvey · Legora · CoCounsel Legal
All three are built to serve a whole firm across research, drafting, and document analysis.
Contract extraction and review at scale
Kira (Litera) · Luminance
Both are built to pull clauses and data points out of very large contract sets.
Word-native drafting copilots
Spellbook · Definely
Both live inside Microsoft Word and work on the open document: redlining, comparison against market standards, and definition lookups. Neither markets a disclosure schedule product.
Deal deliverable drafting
Marveri
Marveri reads the transaction agreement and the whole data room, extracts across every document, and produces what a deal team sends: a cited diligence report, disclosure schedule first drafts, and cap table tie-outs.
Competitor details from each vendor’s site, November 2026: harvey.ai · litera.com/capabilities/review · spellbook.legal · definely.com · legora.com · luminance.com · CoCounsel
See how Marveri drafts disclosure schedules
Common questions
What is the best AI tool for M&A due diligence?
It depends on where your diligence bottleneck is. If it is reviewing tens of thousands of contracts, an extraction tool like Kira is built for that. If the mandate is one AI platform for the whole firm, Harvey and Legora are the broadest options. If the bottleneck is producing the diligence memo and the disclosure schedules, that is what Marveri drafts, cited to the data room. Marveri also works alongside a firm-wide platform like Harvey or Legora.
Can these tools draft disclosure schedules?
Marveri drafts the schedules from the transaction agreement and data room, with every entry cited. Harvey helps lawyers prepare schedules inside its platform when they prompt it. Kira extracts clauses for review; it does not draft schedules.
How should a boutique firm evaluate legal AI?
Judge each tool by its output on your own documents. Ask each vendor to show real work product on a matter like yours. Check that every claim in the output is verifiable against a source document. Then price the tool against the hours it replaces on one deal.
“Marveri is a superpower for experienced attorneys. What used to require a handful of associates sifting through piles of documents over days and weeks can now be done with a single, well-trained lawyer managing the prompts and vetting the outputs.”
Security designed for the most confidential data
Encrypted everywhere
All data is encrypted in transit and at rest. Your data room stays protected from the first upload to the final export.
SOC 2 Type II
Marveri’s security controls are independently audited and tested over time rather than at a single point, so your firm can answer client security reviews with confidence.
Zero training
Your documents are never used to train AI models. What you upload is used for your matters and nothing else.
