Brandwave

How popular isInbox Zero?

In September 2026, people searched for Inbox Zero by name about 140 times worldwide, a 36.4% decrease from 11 months earlier. These searches made up 0.24% of all global AI email assistant searches, placing Inbox Zero sixth out of six assistants. When we asked both ChatGPT and Google AI Overviews about AI email assistants, Inbox Zero appeared in three of the five answers and was the fourth most recommended of the six.

Search and AI answers in September 2026

Inbox Zero is the sixth most searched of 6 competitors and the fourth most recommended in the AI answers we collected.

  1. SuperhumanShare of searches 46.2%Mentioned in 5 of 5 AI answersPlace in AI recommendations 1st
  2. Fyxer AIShare of searches 44.8%Mentioned in 3 of 5 AI answersPlace in AI recommendations 2nd
  3. SaneBoxShare of searches 5%Mentioned in 1 of 5 AI answersPlace in AI recommendations 5th
  4. MailbutlerShare of searches 2.7%Mentioned in 1 of 5 AI answersPlace in AI recommendations 6th
  5. Inbox ZeroShare of searches 0.24%Mentioned in 3 of 5 AI answersPlace in AI recommendations 4th

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Top AI email assistants in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Inbox Zero was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Inbox Zero is the fourth most recommended of the six.

Most recommended by AI

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

  1. Superhuman1st
  2. Fyxer AI2nd
  3. Shortwave3rd
  4. Inbox Zero4th
  5. SaneBox5th
  6. Mailbutler6th

Mentioned by AI

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

  • Superhuman5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Shortwave5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Fyxer AI3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Inbox Zero3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • SaneBox1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Mailbutler1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers

See every answer about AI email assistants

5 answers

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

How often do people search for Inbox Zero compared with other AI email assistants worldwide?

Inbox Zero against AI email assistants worldwide, by month

Share of searches by month for Superhuman, Fyxer AI, SaneBox, Mailbutler, Inbox Zero. The figures are in the table below the chart.

View monthly share of searches table
MonthSuperhumanFyxer AISaneBoxMailbutlerShortwaveInbox Zero
Nov 202523.4%65.2%7.4%3.3%0.58%0.2%
Dec 202527%60.6%8.4%3%0.8%0.17%
Jan 202628.4%60%7.2%3.2%1%0.18%
Feb 202632.6%58%5.2%2.8%1.3%0.19%
Mar 202633.2%56.8%5.5%2.4%1.8%0.19%
Apr 202640.8%47.4%6.9%3%1.7%0.19%
May 202644.4%47.4%5%2.2%0.91%0.18%
Jun 202638.6%40.6%10.9%8.9%0.83%0.24%
Jul 202642.7%43.9%7.4%3.2%2.5%0.3%
Aug 202637.5%36%12.7%10.4%3.1%0.22%
Sep 202646.2%44.8%5%2.7%1%0.24%
Oct 2026——————

  1. 1.Superhuman

    46.2%

    Held 1st. 27K estimated branded searches, +13.1% vs prior month. Share +8.7 points.

  2. 2.Fyxer AI

    44.8%

    Held 2nd. 26.2K estimated branded searches, +14.4% vs prior month. Share +8.8 points.

  3. 3.SaneBox

    5%

    Held 3rd. 2.9K estimated branded searches, -64.2% vs prior month. Share -7.8 points.

  4. 4.Mailbutler

    2.7%

    Held 4th. 1.6K estimated branded searches, -75.8% vs prior month. Share -7.6 points.

  5. 5.Shortwave

    1%

    Held 5th. 590 estimated branded searches, -70.4% vs prior month. Share -2.1 points.

  6. 6.Inbox Zero

    0.24%

    Held 6th. 140 estimated branded searches, 0% vs prior month. Share 0 points.

Compare popularity between Inbox Zero and its closest rivals

Every comparison with Inbox Zero

5 comparisons

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

2 findings
  • Across the 11 months ending September 2026, estimated monthly branded searches for Inbox Zero worldwide fell from 220 to 140.
  • Across the 11 months ending September 2026, Inbox Zero’s share of searches among AI email assistants worldwide held steady, from 0.2% to 0.24%.

How did search popularity change for AI email assistants worldwide in September 2026?

6 changes

  1. In September 2026, Fyxer AI gained share of searches among AI email assistants worldwide, from 36% to 44.8%.

  2. In September 2026, Superhuman gained share of searches among AI email assistants worldwide, from 37.5% to 46.2%.

  3. In September 2026, SaneBox lost share of searches among AI email assistants worldwide, from 12.7% to 5%.

  4. In September 2026, Mailbutler lost share of searches among AI email assistants worldwide, from 10.4% to 2.7%.

  5. In September 2026, Shortwave lost share of searches among AI email assistants worldwide, from 3.1% to 1%.

  6. Estimated monthly branded searches for Inbox Zero worldwide fell 36.4% over 11 measured months, from 220 to 140 in September 2026.

How are Inbox Zero’s branded searches counted?

2 search terms

Brandwave collects information about searches that people make online using Inbox Zero’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.

  • getinboxzero
  • inbox zero ai

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How the Brand Demand Index is measured

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