Brandwave

NotebookLM vs QuillBot:Which is more popular?

In September 2026, NotebookLM had more branded searches than QuillBot among AI summarisation tools worldwide. NotebookLM had about 24.5 million branded searches, while QuillBot had 5 million. NotebookLM made up 81.9% of all AI summarisation tool searches we track, and QuillBot accounted for 16.7%. When we asked ChatGPT and Google AI Overviews about AI summarisation tools, NotebookLM appeared in three of the five answers and QuillBot in two. QuillBot was mentioned before NotebookLM in two out of three answers.

Among AI summarisation tools worldwide in September 2026

Who do people search for more?

NotebookLM, about 5 searches for every 1 for QuillBot

NotebookLM 24.5M searchesQuillBot 5M searches

Who does AI mention more?

NotebookLM, mentioned in 3 of 5 answers, QuillBot in 2

NotebookLM in 3 of 5QuillBot in 2 of 5

Who does AI recommend more?

QuillBot, named ahead of NotebookLM in 2 of 3 answers

QuillBot first in 2NotebookLM first in 1

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Top AI summarisation tools in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, NotebookLM was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. QuillBot was mentioned in two out of five: not in any of the three ChatGPT answers, but in both Google AI Overviews. QuillBot was listed before NotebookLM in two out of three answers.

Most recommended by AI

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

  1. TLDR This1st
  2. QuillBot2nd
  3. Scholarcy3rd
  4. NotebookLM4th
  5. Otter–

Mentioned by AI

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

  • NotebookLM3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • QuillBot2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Scholarcy2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • TLDR This2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Otter0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about AI summarisation tools

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.

Is NotebookLM or QuillBot more popular in search?

This chart shows how often people search Google for NotebookLM and QuillBot by name. Each line represents a brand's share of searches for all five AI summarisation tools we track, month by month, from English-language searches worldwide.

NotebookLM and QuillBot among AI summarisation tools worldwide, by month

Share of searches by month for NotebookLM, QuillBot. The figures are in the table below the chart.

View monthly share of searches table
MonthNotebookLMQuillBotOtterScholarcyTLDR This
Oct 202554.9%42.2%2.6%0.19%0.02%
Nov 202558.9%38.9%2%0.14%0.02%
Dec 202571.4%26.8%1.7%0.12%0.02%
Jan 202675.1%23%1.8%0.1%0.01%
Feb 202675.1%23%1.8%0.1%0.01%
Mar 202675.2%23%1.8%0.1%0.01%
Apr 202681.6%16.7%1.6%0.07%0.01%
May 202681.9%16.8%1.3%0.06%<0.01%
Jun 202681.9%16.7%1.3%0.05%<0.01%
Jul 202681.2%17.2%1.6%0.04%<0.01%
Aug 202678.7%19.7%1.5%0.04%<0.01%
Sep 202681.9%16.7%1.3%0.05%<0.01%

How has the NotebookLM and QuillBot comparison changed over the last 12 months?

3 findings
  • NotebookLM was ahead of QuillBot in every measured month of the 12 months ending September 2026.
  • Across the 12 months ending September 2026, NotebookLM’s share of searches among AI summarisation tools worldwide moved from 54.9% to 81.9%, and its estimated monthly branded searches moved from 11.9M to 24.5M.
  • Across the 12 months ending September 2026, QuillBot’s share of searches among AI summarisation tools worldwide moved from 42.2% to 16.7%, and its estimated monthly branded searches moved from 9.1M to 5M.

How did search popularity change for AI summarisation tools worldwide in September 2026?

2 changes

  1. In September 2026, NotebookLM gained share of searches among AI summarisation tools worldwide, from 78.7% to 81.9%.

  2. In September 2026, QuillBot lost share of searches among AI summarisation tools worldwide, from 19.7% to 16.7%.

How are branded searches counted?

3 search terms

Brandwave collects information about searches that people make online using NotebookLM’s and QuillBot’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.

NotebookLM

2 branded search terms

  • notebook lm
  • notebooklm

QuillBot

1 branded search term

  • quillbot

How the Brand Demand Index is measured

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