Based only on the facts in our directory. The right pick still depends on the job you need done.
Lower starting price
Not comparable
Not comparable: Definely does not list a price
Free plan
Tie
Neither has one
Higher rating
Luminance
4.0 against 4.2
Same job?
Yes
Both are Legal AI tools
Side by side
Compared on
Definely
Luminance
Our rating
4.0
4.2Better
Starts at
Not listed
Not listed
Free plan
No
No
Category
Legal AI
Legal AI
Plans
See pricing
See pricing
Key features
AI drafting, editing, and proofreading built for complex negotiated documents
Catches defined-term errors and cross-reference mistakes in dense contracts
Nearly tripled annual recurring revenue in 2024
Works with roughly 100 in-house legal teams and law firms
$30M Series B led by Revaia, with legal tech company Clio participating
Proprietary LLMX model trained specifically on legal documents
Pattern-recognition engine trained on 150 million-plus legal documents
One of the earliest companies applying machine learning to legal contracts, since 2015
1,000+ organizations across 70 countries as of May 2026
Used by all Big Four consultancies and 25%+ of Global Top 100 law firms
Pros
Founders' Big Law background shows in a focus on genuinely complex documents
Strong recent revenue growth validates real demand among legal teams
Backed by Clio, a legal tech company with direct category expertise
Purpose-built legal model rather than a general-purpose LLM adapted afterward
Genuinely massive scale and blue-chip client base validate real-world reliability
Longest operating history in this category, predating the current legal-AI wave by years
Cons
Pricing isn't published, requires a sales conversation to get a quote
Narrower focus on document precision rather than full contract lifecycle management
Smaller company with less brand recognition than larger legal AI platforms
Pricing isn't published, requires a direct sales conversation
Proprietary-model approach may iterate more slowly than platforms built on frontier LLMs
Enterprise scale and client base suggest better fit for larger organizations
Company
Definely, founded 2020
Luminance, founded 2015
Prices come from each vendor's pricing page, last checked 20260715. Check the vendor before you buy.
FAQ
Questions people ask
Is Definely better than Luminance?
In our reviews Definely scores 4.0 and Luminance scores 4.2. The better pick depends on the job. Definely: Nearly tripled ARR in a single year, built by two former Freshfields lawyers. Luminance: Trained its own proprietary LLM on more than 150 million legal documents.
Luminance
Definely
