Sentinel vs Relativity: eDiscovery Platform Comparison
Overview
Relativity has been the dominant name in eDiscovery for over a decade. Its RelativityOne cloud platform serves AmLaw 100 firms, corporations, and government agencies worldwide. Sentinel Counsel represents a fundamentally different approach — a privilege-first AI platform built specifically for litigation teams that need enterprise-grade capabilities without the complexity, cost, or privilege risks of legacy systems.
This comparison examines how the two platforms differ across the dimensions that matter most to law firms evaluating eDiscovery technology in 2026: AI capabilities and privilege protection, document review workflow, deployment and pricing, and overall fit for small and mid-size firms.
AI Capabilities and Privilege Protection
Relativity offers AI through its aiR suite — including aiR for Review (automated document coding) and aiR for Privilege (privilege identification). These tools leverage large language models to analyze documents and predict coding decisions. However, RelativityOne operates as a multi-tenant cloud platform, and firms must evaluate whether the platform's data handling practices satisfy the privilege-protection standards established by Heppner.
Sentinel Counsel was designed from the ground up with privilege-by-design architecture. Every AI interaction occurs within the privilege boundary. No document content is shared with third-party AI providers, no model training occurs on client data, and every AI query is logged with a complete audit trail for defensibility. The platform's voice-first interface allows attorneys to interact with case data using natural language — querying documents, identifying inconsistencies, and drafting privilege logs without navigating complex software interfaces.
For firms where privilege protection is the primary concern — particularly those handling government investigations, white-collar defense, or matters involving highly sensitive trade secrets — Sentinel Counsel's zero-exposure architecture provides a level of assurance that multi-tenant cloud platforms cannot match.
Feature-by-Feature Comparison
The table below summarizes how Sentinel Counsel and Relativity compare across the capabilities that matter most to litigation teams evaluating eDiscovery platforms in 2026.
| Feature | Sentinel Counsel | Relativity |
|---|---|---|
| Document Review | AI-powered privilege detection, voice-first querying, automated privilege log drafting | Customizable coding layouts, batch sets, analytics suite with clustering and email threading |
| Privilege Protection | Zero-exposure architecture — no data sent to third parties | Multi-tenant cloud; contractual protections |
| Processing & Ingestion | AI-powered culling at ingestion, integrated legal hold | Mature processing pipeline, extensive format support |
| Deposition Support | Real-time AI testimony analysis, voice-first querying during depositions | Not included natively |
| Compliance Monitoring | Multi-channel surveillance, AI anomaly detection within privilege boundary | Not included; eDiscovery-focused |
| Interface | Voice-first AI, minimal training required | Complex UI, requires dedicated litigation support staff |
| Pricing Model | Subscription-based, no per-GB fees | Per-user licensing + per-GB storage fees |
| Best For | Small/mid-size firms, privilege-sensitive matters | Large firms with dedicated lit support teams |
Pricing and Deployment
RelativityOne pricing is typically based on a combination of per-user licensing and per-gigabyte storage fees. For large firms with dedicated litigation support departments and substantial case volumes, this model can be cost-effective. For smaller firms with intermittent eDiscovery needs, the total cost of ownership — including licensing, storage, training, and administration — can be prohibitive.
Sentinel Counsel offers subscription-based pricing designed for small and mid-size firms. The platform eliminates per-gigabyte fees, reducing cost unpredictability for data-heavy matters. Setup is minimal compared to Relativity's more complex configuration requirements, and the voice-first interface reduces training time significantly.
Firms should evaluate total cost of ownership over a multi-year period, including licensing, storage, personnel costs for administration and training, and the opportunity cost of attorney time spent navigating complex interfaces versus practicing law.
Which Platform Is Right for Your Firm?
Relativity remains the right choice for large firms with established litigation support teams, high case volumes, and the resources to maximize a complex platform's capabilities. Its ecosystem of integrations, marketplace of add-ons, and extensive customization options serve these firms well.
Sentinel Counsel is built for firms that want AI-powered eDiscovery with uncompromising privilege protection, minimal administrative overhead, and a modern interface that attorneys can use directly. If your firm handles sensitive matters where privilege is paramount, or if you need enterprise-grade AI without enterprise-grade complexity, Sentinel Counsel delivers capabilities that legacy platforms were not designed to provide.
Migration and Transition Considerations
Migrating from Relativity to Sentinel Counsel — or adding Sentinel Counsel alongside an existing Relativity deployment — requires careful planning. Firms with years of case data in Relativity must evaluate data export capabilities, format compatibility, and the costs of maintaining access to archived matters. Sentinel Counsel supports standard eDiscovery data formats for import, and its processing pipeline handles the conversion from Relativity's proprietary formats.
Many firms adopt a phased approach: using Sentinel Counsel for new, privilege-sensitive matters while maintaining Relativity for ongoing cases and archived work product. This reduces migration risk while allowing attorneys to experience the benefits of privilege-first AI in a real case context. Over time, as attorneys gain confidence with the new platform, the transition accelerates naturally.
For firms currently negotiating Relativity renewals, evaluating Sentinel Counsel before committing to a new multi-year contract is a prudent step. The eDiscovery market is evolving rapidly, and platforms built on privilege-first AI architecture represent the future direction of the industry.