Brandwave

Inbox Zero vs Superhuman:Which is more popular?

In September 2026, Superhuman had more branded searches than Inbox Zero among AI email assistants worldwide. Superhuman had about 27,000 branded searches, while Inbox Zero had 140. Superhuman made up 46.2% of all AI email assistant searches we track, and Inbox Zero accounted for 0.24%. When we asked ChatGPT and Google AI Overviews about AI email assistants, Superhuman appeared in all five answers and Inbox Zero in three. Superhuman was mentioned before Inbox Zero in four out of five answers.

Among AI email assistants worldwide in September 2026

Who do people search for more?

Superhuman, about 193 searches for every 1 for Inbox Zero

Superhuman 27K searchesInbox Zero 140 searches

Who does AI mention more?

Superhuman, mentioned in every answer we collected

Superhuman in 5 of 5Inbox Zero in 3 of 5

Who does AI recommend more?

Superhuman, named ahead of Inbox Zero in 4 of 5 answers

Superhuman first in 4Inbox Zero first in 1

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Top AI email assistants in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Superhuman appeared in all five answers. Inbox Zero was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Superhuman was listed before Inbox Zero in four out of five answers.

Most recommended by AI

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

  1. Superhuman1st
  2. Inbox Zero2nd

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
  • Inbox Zero3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 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.

Is Inbox Zero or Superhuman more popular in search?

This chart shows how often people search Google for Inbox Zero and Superhuman by name. Each line represents a brand's share of searches for all six AI email assistants we track, month by month, from English-language searches worldwide.

Inbox Zero and Superhuman among AI email assistants worldwide, by month

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

View monthly share of searches table
MonthSuperhumanInbox Zero
Nov 202523.4%0.2%
Dec 202527%0.17%
Jan 202628.4%0.18%
Feb 202632.6%0.19%
Mar 202633.2%0.19%
Apr 202640.8%0.19%
May 202644.4%0.18%
Jun 202638.6%0.24%
Jul 202642.7%0.3%
Aug 202637.5%0.22%
Sep 202646.2%0.24%
Oct 2026——

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

3 findings
  • Superhuman was ahead of Inbox Zero in every measured month of the 11 months ending September 2026.
  • Across the 11 months ending September 2026, Inbox Zero’s share of searches among AI email assistants worldwide moved from 0.2% to 0.24%, and its estimated monthly branded searches moved from 220 to 140.
  • Across the 11 months ending September 2026, Superhuman’s share of searches among AI email assistants worldwide moved from 23.4% to 46.2%, and its estimated monthly branded searches moved from 25.8K to 27K.

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

2 changes

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

  2. 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 and Superhuman’s branded searches counted?

6 search terms

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

Inbox Zero

2 branded search terms

  • getinboxzero
  • inbox zero ai

Superhuman

4 branded search terms

  • superhuman ai
  • superhuman ai email assistant
  • superhuman email
  • superhuman email client

How the Brand Demand Index is measured

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