Brandwave

How popular isGrammarly?

In September 2026, people searched for Grammarly by name about 5.1 million times worldwide, a 33.4% decrease from the previous year. These searches made up 24.6% of all global AI browser extension searches, placing Grammarly second out of seven extensions. When we asked both ChatGPT and Google AI Overviews about AI browser extensions, Grammarly appeared in three of the five answers and was the fourth most recommended of the seven.

Search and AI answers in September 2026

Grammarly is the second most searched of 7 competitors and the fourth most recommended in AI answers.

  1. MonicaShare of searches 34.6%Mentioned in 3 of 5 AI answersPlace in AI recommendations 3rd
  2. GrammarlyShare of searches 24.6%Mentioned in 3 of 5 AI answersPlace in AI recommendations 4th
  3. MerlinShare of searches 23.1%Mentioned in 2 of 5 AI answersPlace in AI recommendations 5th
  4. SiderShare of searches 12.7%Mentioned in 2 of 5 AI answersPlace in AI recommendations 2nd
  5. HarpaShare of searches 3.1%Mentioned in 2 of 5 AI answersPlace in AI recommendations 5th

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Top AI browser extensions in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Grammarly was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Grammarly is the fourth most recommended of the seven.

Most recommended by AI

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

  1. Perplexity1st
  2. Sider2nd
  3. Monica3rd
  4. Grammarly4th
  5. Merlin5th
  6. Harpa5th
  7. MaxAI7th

Mentioned by AI

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

  • Monica3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Grammarly3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Perplexity3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Merlin2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Sider2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Harpa2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • MaxAI1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers

See every answer about AI browser extensions

5 answers

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

Which AI browser extensions compete with Grammarly?

Grammarly against AI browser extensions worldwide, by month

Share of searches by month for Monica, Grammarly, Merlin, Sider, Harpa. The figures are in the table below the chart.

View monthly share of searches table
MonthMonicaGrammarlyMerlinSiderHarpaMaxAIPerplexity
Oct 202530.4%27.8%20.4%16.7%2.7%1.5%0.43%
Nov 202531.1%24.8%20.9%17.1%3.4%2.3%0.37%
Dec 202528.4%37.9%15.5%12.7%3.1%2.1%0.31%
Jan 202628.4%33.7%19%12.7%3.8%2.1%0.28%
Feb 202635.8%32.1%16.1%10.8%3.2%1.8%0.23%
Mar 202639.4%28.9%14.5%11.8%3.5%1.6%0.21%
Apr 202631%34.2%17.1%11.4%4.2%1.9%0.25%
May 202630.1%33.8%16.5%13.5%4%1.8%0.24%
Jun 202631.9%29.1%21.3%11.7%3.5%2.3%0.21%
Jul 202633.1%30.2%22.1%9.9%3%1.6%0.18%
Aug 202634.5%27.3%23%10.3%3.1%1.7%0.15%
Sep 202634.6%24.6%23.1%12.7%3.1%1.7%0.18%

  1. 1.Monica

    34.6%

    Held 1st. 90.5K estimated branded searches, 0% vs prior month. Share +0.2 points.

  2. 2.Grammarly

    24.6%

    Held 2nd. 64.3K estimated branded searches, -10.3% vs prior month. Share -2.7 points.

  3. 3.Merlin

    23.1%

    Held 3rd. 60.5K estimated branded searches, 0% vs prior month. Share +0.1 points.

  4. 4.Sider

    12.7%

    Held 4th. 33.1K estimated branded searches, +22.1% vs prior month. Share +2.3 points.

  5. 5.Harpa

    3.1%

    Held 5th. 8.1K estimated branded searches, 0% vs prior month. Share 0 points.

  6. 6.MaxAI

    1.7%

    Held 6th. 4.4K estimated branded searches, 0% vs prior month. Share 0 points.

  7. 7.Perplexity

    0.18%

    Held 7th. 480 estimated branded searches, +23.1% vs prior month. Share 0 points.

Compare popularity between Grammarly and its closest rivals

Every comparison with Grammarly

23 comparisons

How has branded search demand for Grammarly changed worldwide over the last 12 months?

3 findings
  • Across the 12 months ending September 2026, estimated monthly branded searches for Grammarly worldwide fell from 7.6M to 5.1M.
  • Across the 12 months ending September 2026, Grammarly’s share of searches among AI browser extensions worldwide decreased from 27.8% to 24.6%.
  • Across the 12 months ending September 2026, Grammarly’s share of searches among AI browser extensions worldwide peaked at 37.9% in December 2025 and was lowest at 24.6% in September 2026.

How did search popularity change for AI browser extensions worldwide in September 2026?

6 changes

  1. In September 2026, Sider gained share of searches among AI browser extensions worldwide, from 10.3% to 12.7%.

  2. In September 2026, Grammarly lost share of searches among AI browser extensions worldwide, from 27.3% to 24.6%.

  3. Monica’s share of searches among AI browser extensions worldwide has gained ground for 3 months in a row, from 31.9% to 34.6% in September 2026.

  4. Merlin’s share of searches among AI browser extensions worldwide has gained ground for 3 months in a row, from 21.3% to 23.1% in September 2026.

  5. Estimated monthly branded searches for Perplexity worldwide fell 74.7% over 12 measured months, from 1.9K to 480 in September 2026.

  6. Estimated monthly branded searches for MaxAI worldwide fell 33.3% over 12 measured months, from 6.6K to 4.4K in September 2026.

How are Grammarly’s branded searches counted?

8 search terms

Brandwave collects information about searches that people make online using Grammarly’s name. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brand is growing, holding steady, or fading.

  • grammar grammarly
  • grammarly
  • grammarly app
  • grammarly chrome extension
  • grammarly extension
  • grammarly software
  • grammarly writing assistant
  • writing assistant grammarly

Do you work for Grammarly? To request corrections or removal please contact us via our support page and we will be happy to assist.

How the Brand Demand Index is measured

Where does Grammarly compete?

Grammarly is ranked in four competitor sets. Each share is worked out among that set's brands, so it differs from set to set.
Competitor setRankShare of searchesRanking
Writing assistants1st of 845.5%Show ranking
Plagiarism checkers1st of 761.8%Show ranking
AI writing assistants7th of 70.01%Show ranking
AI browser extensions2nd of 724.6%Shown above
Creator with pink hair and a pink jacket

Is Grammarly your brand?

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