Relativity vs DISCO: eDiscovery AI Compared
Relativity with aiR and DISCO are the two eDiscovery platforms most firms choose between. Where each is stronger, what they cost, and who should pick which.
Relativity with its aiR layer and DISCO are the two dominant eDiscovery platforms, and both carry substantial AI. Relativity suits firms with in-house expertise and complex protocols; DISCO suits teams who want less to administer. The matter profile decides it more than the feature list.
Relativity (with the aiR layer) and DISCO are the two dominant eDiscovery platforms for law firms in 2026. Both have substantial AI capabilities. For litigation firms choosing or evaluating, the comparison matters.
The short answer
- Relativity with aiR — Industry standard at AmLaw firms, deep customization, established ecosystem
- DISCO — Modern cloud-native challenger gaining share at firms valuing simpler operations and modern architecture
Choice often comes down to firm preference, existing relationships, and matter type.
Feature parity
Both offer:
- Predictive coding / TAR
- Concept clustering
- Privilege detection
- Search analytics
- Production preparation
- Multi-matter management
Output quality is roughly comparable for most matters.
Architecture
Relativity: Available cloud-hosted and on-prem. More customizable. Deeper at large-scale enterprise.
DISCO: Cloud-native. Simpler operations. Modern architecture.
Pricing
Both use per-matter pricing that scales with document volume, so a major M&A litigation or class action costs far more than a small matter. Get a quote per matter.
Pricing varies significantly with matter complexity and platform terms.
When Relativity wins
- AmLaw firm with established Relativity infrastructure
- Complex multi-matter management
- Heavy customization requirements
- Existing Relativity-trained staff
When DISCO wins
- Mid-size firm wanting modern architecture
- Cloud-native preference
- Simpler operations requirement
- Faster deployment needed
What we recommend
For AmLaw firms: typically Relativity due to existing infrastructure.
For mid-size firms: DISCO increasingly the choice for modern architecture.
For both: the platform choice matters less than the workflow discipline (TAR protocols, QC, defensibility).
Bottom line
Both are competent eDiscovery platforms with AI. Relativity is the AmLaw default; DISCO is the modern challenger. Choose based on firm scale, existing infrastructure, and operational preferences.
The platform choice matters less than:
- TAR protocol design
- Quality control discipline
- Defensibility documentation
- Attorney supervision
Practitioner excellence on top of either platform delivers strong results.
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Frequently asked questions
Which is better, Relativity or DISCO?
Different fits. Relativity for AmLaw with existing infrastructure and customization needs. DISCO for mid-size firms wanting cloud-native simplicity. Output quality is comparable on most matters.
What do they cost?
Both use per-matter pricing that scales with document volume. Specifics vary with platform terms and matter complexity, so get a quote per matter.
Should I switch from Relativity to DISCO?
Major change. Workflow rebuild, staff retraining, integration adjustments. Don't switch unless specific reason justifies disruption. Many firms run both for different matter types during transition.
Do they require custom TAR training per matter?
Yes — both require seed set training per matter. Custom training is essential for defensibility. Most matters need iterative refinement to reach acceptable accuracy.
Which is more defensible?
Both are equally defensible when deployed with proper TAR protocols, sample validation, and documented process. Defensibility comes from practitioner discipline, not platform choice.
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