Harvey vs LegalOn:Which is more popular?
In September 2026, Harvey had more branded searches than LegalOn among AI legal assistants worldwide. Harvey had about 135,000 branded searches, while LegalOn had 49,500. Harvey made up 52.8% of all AI legal assistant searches we track, and LegalOn accounted for 19.4%. When we asked ChatGPT and Google AI Overviews about AI legal assistants, Harvey appeared in four of the five answers and LegalOn in one. Harvey was mentioned before LegalOn in every answer that named either.
Who do people search for more?
Harvey, about 3 searches for every 1 for LegalOn
Who does AI mention more?
Harvey, mentioned in 4 of 5 answers, LegalOn in 1
Who does AI recommend more?
Harvey, named ahead of LegalOn in 4 of 4 answers
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Top AI legal assistants in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Harvey was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. LegalOn was mentioned in one out of five: in one of the three ChatGPT answers, but not in either of the two Google AI Overviews. Harvey was listed before LegalOn in every answer that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
CoCounsel5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Lexis+ AI5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers- Harvey4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
LegalOn1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Spellbook1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
DoNotPay0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Robin AI0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about AI legal assistants
5 answers
Asked ChatGPT
“Which AI legal assistant should I use?”
Asked ChatGPT
“What are the best AI legal assistants?”
Asked ChatGPT
“What's the best AI legal assistant for legal research?”
Searched Google, AI Overview
“ai legal assistant”
Searched Google, AI Overview
“legal research ai”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Harvey or LegalOn more popular in search?
This chart shows how often people search Google for Harvey and LegalOn by name. Each line represents a brand's share of searches for all seven AI legal assistants we track, month by month, from English-language searches worldwide.
Share of searches by month for Harvey, LegalOn. The figures are in the table below the chart.
View monthly share of searches table
| Month | Harvey | LegalOn | Spellbook | CoCounsel | Lexis+ AI | DoNotPay | Robin AI |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 34.9% | 28.5% | 10.5% | 6% | 9.9% | 3.8% | 6.5% |
| Nov 2025 | 33.8% | 27.7% | 10.1% | 7.3% | 9.3% | 4.5% | 7.3% |
| Dec 2025 | 36.5% | 29.9% | 10.9% | 6.5% | 6.9% | 4% | 5.3% |
| Jan 2026 | 32.9% | 32.9% | 12.1% | 7.1% | 7.6% | 3.6% | 3.9% |
| Feb 2026 | 42.8% | 23.4% | 10.5% | 7.6% | 8.1% | 4.7% | 2.8% |
| Mar 2026 | 43.6% | 24% | 10.7% | 7.6% | 8.6% | 3.2% | 2.3% |
| Apr 2026 | 47.3% | 21.3% | 9.6% | 6.8% | 8.3% | 4.3% | 2.5% |
| May 2026 | 47.7% | 21.5% | 9.6% | 7.2% | 7.2% | 4.3% | 2.5% |
| Jun 2026 | 48.9% | 22% | 8% | 7.2% | 7.8% | 3.6% | 2.5% |
| Jul 2026 | 49.6% | 22.3% | 8.2% | 7.3% | 6.9% | 3.7% | 2.1% |
| Aug 2026 | 49.7% | 22.4% | 8.2% | 7.4% | 6.9% | 3.7% | 1.7% |
| Sep 2026 | 52.8% | 19.4% | 8.7% | 7.7% | 6.5% | 3.2% | 1.8% |
How has the Harvey and LegalOn comparison changed over the last 12 months?
3 findings
- Harvey was ahead of LegalOn in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Harvey’s share of searches among AI legal assistants worldwide moved from 34.9% to 52.8%, and its estimated monthly branded searches moved from 74K to 135K.
- Across the 12 months ending September 2026, LegalOn’s share of searches among AI legal assistants worldwide moved from 28.5% to 19.4%, and its estimated monthly branded searches moved from 60.5K to 49.5K.
How did search popularity change for AI legal assistants worldwide in September 2026?
2 changes
In September 2026, Harvey gained share of searches among AI legal assistants worldwide, from 49.7% to 52.8%.
In September 2026, LegalOn lost share of searches among AI legal assistants worldwide, from 22.4% to 19.4%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Harvey’s and LegalOn’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among AI legal assistants
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