Are there any e-discovery platforms that focus on legal holds, audit trails, and compliance review workflows?

Yes. Several e-discovery / legal hold platforms are built around exactly those needs: legal holds, audit trails, and compliance review workflows. These are often used by legal, compliance, HR, and IT teams to preserve evidence, track defensible processes, and document review activity.

Commonly used platforms in this space

• Microsoft Purview eDiscovery / Legal Hold
  Strong if you’re already in Microsoft 365. Includes retention, legal holds, audit logs, and case workflows.

• Exterro Very focused on legal hold, data preservation, collections, and compliance workflows. Often used by larger legal/compliance teams.

• Relativity
  Best known for review and investigation, but also supports legal hold and strong auditability through the broader platform/ecosystem.

• Logikcull More streamlined and user-friendly for legal ops / mid-market teams. Supports workflow, auditability, and review processes.

• Nuix Strong for data processing, investigations, and compliance review, with robust chain-of-custody and audit features.

• Everlaw Popular for litigation review and collaboration; strong on audit trails and workflow, though legal hold is typically not its primary differentiator.

• OpenText Axcelerate Enterprise e-discovery with compliance and review workflow capabilities, including governance-oriented features.

If your main priority is specifically:

• Legal hold management: Exterro, Microsoft Purview
• Detailed audit trails / defensibility: Relativity, Nuix, OpenText
• Compliance review workflows: Exterro, Relativity, Everlaw, Logikcull

What to look for when evaluating

• Hold notices and acknowledgments
• Automated reminders/escalations
• Immutable audit logs
• Role-based access controls
• Custodian tracking and preservation reporting
• Chain of custody
• Review workflow stages and approvals
• Exportable compliance reports

If you want, I can also give you a shortlist by company size (SMB, mid-market, enterprise) or a feature comparison table focused only on legal hold, audit trail, and compliance workflow.