Brandwave

Fastcase vs Lexis+ AI:Which is more popular?

In September 2026, Lexis+ AI had more branded searches than Fastcase among legal research platforms worldwide. Lexis+ AI had about 16,500 branded searches, while Fastcase had 3,600. Lexis+ AI made up 2.3% of all legal research platform searches we track, and Fastcase accounted for 0.5%. When we asked ChatGPT and Google AI Overviews about legal research platforms, Fastcase and Lexis+ AI each appeared in four of the five answers. Lexis+ AI was mentioned before Fastcase in three out of five answers.

Among legal research platforms worldwide in September 2026

Who do people search for more?

Lexis+ AI, about 5 searches for every 1 for Fastcase

Lexis+ AI 16.5K searchesFastcase 3.6K searches

Who does AI mention more?

Both were mentioned in 4 of 5 answers.

Fastcase in 4 of 5Lexis+ AI in 4 of 5

Who does AI recommend more?

Lexis+ AI, named ahead of Fastcase in 3 of 5 answers

Lexis+ AI first in 3Fastcase first in 2

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Top legal research platforms in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Fastcase was mentioned in four out of five: in two of the three ChatGPT answers and in both Google AI Overviews. Lexis+ AI was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Lexis+ AI was listed before Fastcase in three out of five answers.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Westlaw1st
  2. Bloomberg Law2nd
  3. Lexis+ AI3rd
  4. LexisNexis4th
  5. Fastcase5th
  6. CourtListener6th
  7. vLex7th
  8. Justia8th
  9. Casetext9th

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • LexisNexis5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Westlaw5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Bloomberg Law5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Lexis+ AI4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Fastcase4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • CourtListener3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • vLex2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Justia2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Casetext2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers

See every answer about legal research platforms

5 answers

Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.

Is Fastcase or Lexis+ AI more popular in search?

This chart shows how often people search Google for Fastcase and Lexis+ AI by name. Each line represents a brand's share of searches for all nine legal research platforms we track, month by month, from English-language searches worldwide.

Fastcase and Lexis+ AI among legal research platforms worldwide, by month

Share of searches by month for Lexis+ AI, Fastcase. The figures are in the table below the chart.

View monthly share of searches table
MonthLexisNexisWestlawvLexCourtListenerJustiaLexis+ AIBloomberg LawCasetextFastcase
Oct 202541.8%41.8%6.9%1.7%2.5%2.4%1.7%0.75%0.5%
Nov 202544.3%36.2%8.9%2.2%2.7%2.5%1.8%0.97%0.43%
Dec 202544.7%36.5%7.4%2.7%3.3%2.1%1.8%0.98%0.53%
Jan 202644.7%36.6%7.4%3.3%2.7%2.1%2.2%0.65%0.43%
Feb 202647.1%31.5%6.3%5.2%4.2%2.2%2.3%0.84%0.37%
Mar 202648.5%32.4%8%2.9%2%2.9%2.4%0.47%0.47%
Apr 202647.4%31.6%9.5%3.5%2.3%3%1.6%0.57%0.46%
May 202647.6%31.8%9.6%3.5%2.3%2.6%1.6%0.46%0.46%
Jun 202646.8%31.3%11.5%3.5%1.9%2.7%1.5%0.45%0.37%
Jul 202649.8%27.3%12.2%3.7%2%2.5%1.6%0.31%0.48%
Aug 202649.4%33%6.6%3.6%2%2.5%2%0.26%0.59%
Sep 202642%34.3%12.6%3.1%2.5%2.3%1.7%0.92%0.5%

How has the Fastcase and Lexis+ AI comparison changed over the last 12 months?

3 findings

How did search popularity change for legal research platforms worldwide in September 2026?

4 changes

  1. In September 2026, Casetext overtook Fastcase to rank 8th among legal research platforms worldwide, with 0.92% of the searches.

  2. In September 2026, Justia overtook Lexis+ AI and Bloomberg Law to rank 5th among legal research platforms worldwide, with 2.5% of the searches.

  3. Estimated monthly branded searches for Lexis+ AI worldwide fell 21.4% over 12 measured months, from 21K to 16.5K in September 2026.

  4. Estimated monthly branded searches for Fastcase worldwide fell 18.2% over 12 measured months, from 4.4K to 3.6K in September 2026.

How are branded searches counted?

3 search terms

Brandwave collects information about searches that people make online using Fastcase’s and Lexis+ AI’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.

Fastcase

1 branded search term

  • fastcase

Lexis+ AI

2 branded search terms

  • lexis ai
  • lexis protege

How the Brand Demand Index is measured

Other head-to-heads among legal research platforms

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