Selection guide

Best AI Tools for Due Diligence

Select due diligence software around document scope, review questions and evidence traceability. Legal document analysis and litigation discovery overlap, but serve different review processes. Compare the shortlist using a known document set, access controls and exportable findings. A fast summary is insufficient if the reviewer cannot trace its conclusions to evidence.

By 4now, Editorial guide•Updated: September 8, 2026

Quick answer

Select due diligence software around document scope, review questions and evidence traceability. Legal document analysis and litigation discovery overlap, but serve different review processes. Compare the shortlist using a known document set, access controls and exportable findings. A fast summary is insufficient if the reviewer cannot trace its conclusions to evidence.

Compare workflow fit

This is a scoped shortlist by workflow fit, not a tested performance ranking or a comprehensive market survey. Profiles passed editorial review for the stated scope; validate capabilities against the linked product documentation. Current prices, certifications and product availability are not independently verified.

ToolListed workflowPricingWhat to verify
LuminanceReviewing and analyzing contract collectionsConfirm current vendor planCheck contract analysis with a representative task
Harvey AILaw firms evaluating assistance across documents and repeated legal tasksConfirm current vendor planCheck assistant with a representative task
Casetext CoCounselLegal teams evaluating evidence-linked research and document workConfirm current vendor planCheck legal research with a representative task
RelativityDiscovery and large-document review processesConfirm current vendor planCheck document review with a representative task

Luminance

Self-learning Document Review

Reviewing and analyzing contract collections

Potential advantage
A document-collection workflow can support repeatable extraction questions.
Limitation
An extracted clause is not a complete legal conclusion.
Pilot task
Include unusual clause wording and conflicting documents; track missed issues.
Check current vendor pricing

Harvey AI

Assistant

Law firms evaluating assistance across documents and repeated legal tasks

Potential advantage
A common workspace can support several legal tasks.
Limitation
A broad platform needs configuration and clear review ownership.
Pilot task
Estimated effort: set up a small authorized team, a permitted document set and acceptance criteria for cited answers and drafts.
Check current vendor pricing

Casetext CoCounsel

Legal research

Legal teams evaluating evidence-linked research and document work

Potential advantage
Evidence-linked work provides an explicit verification step.
Limitation
Product packaging and content entitlements need careful checking.
Pilot task
Estimated effort: evaluate source coverage and document permissions before piloting one research question and one document task.
Check current vendor pricing

Relativity

AI eDiscovery

Discovery and large-document review processes

Potential advantage
A discovery-oriented process may help organize evidence and review tasks.
Limitation
Litigation discovery features do not automatically satisfy transaction due diligence.
Pilot task
Test permissions, search recall and export of evidence-linked findings.
Check current vendor pricing

Alternatives and scope

Shortlist by the job that needs doing. Products are ordered for workflow comparison, not a numerical ranking. Consider the other profiles in this guide when their scope matches your task; keep your existing process as the pilot baseline. We do not add unrelated products to reach a target list length.

Selection criteria

Use a representative document set to check extraction, citations, cross-document consistency, permissions and exportable findings. Measure missed issues as well as reviewer time.

Advantages and limitations

A focused tool can reduce handoffs for one repeated task; a broader platform may help coordinate the entire workflow. The tradeoff is integration effort, configuration and review overhead. Compare the total process rather than a vendor's headline speed claim.

Reviewers must verify findings against source documents; this shortlist does not demonstrate completeness or legal accuracy.

Compare total cost

Request the current quote and identify seat charges, usage limits, implementation, support and export costs. Record the plan, currency, billing term and date alongside every quote. A free trial does not establish the long-term cost.

Run a measured pilot

Choose a representative sample with known outcomes. Record baseline time and quality, repeat the task with the software, and include correction and review time. Define acceptance criteria before the pilot. Keep the manual process available until the new workflow meets those criteria.

Sources

Frequently Asked Questions

Common questions about AI tools for your workflow

Find tools for your workflow

Use your needs and constraints to narrow the shortlist.