Inbox Zero vs Mailbutler:Which is more popular?
In September 2026, Mailbutler had more branded searches than Inbox Zero among AI email assistants worldwide. Mailbutler had about 1,600 branded searches, while Inbox Zero had 140. Mailbutler made up 2.7% 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, Inbox Zero appeared in three of the five answers and Mailbutler in one. Inbox Zero was mentioned before Mailbutler in three out of four answers that named either.
Who do people search for more?
Mailbutler, about 11 searches for every 1 for Inbox Zero
Who does AI mention more?
Inbox Zero, mentioned in 3 of 5 answers, Mailbutler in 1
Who does AI recommend more?
Inbox Zero, named ahead of Mailbutler in 3 of 4 answers
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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. Mailbutler was mentioned in one out of five: not in any of the three ChatGPT answers, but in one of the two Google AI Overviews. Inbox Zero was listed before Mailbutler in three out of four answers that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
- Inbox Zero1st
- Mailbutler2nd
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Inbox Zero3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 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
Asked ChatGPT
“Which AI email assistant should I use?”
Asked ChatGPT
“What are the best AI email assistants?”
Asked ChatGPT
“What's the best AI email assistant for a busy inbox?”
Searched Google, AI Overview
“ai email assistants”
Searched Google, AI Overview
“email productivity tool”
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 Mailbutler more popular in search?
This chart shows how often people search Google for Inbox Zero and Mailbutler 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.
Share of searches by month for Mailbutler, Inbox Zero. The figures are in the table below the chart.
View monthly share of searches table
| Month | Mailbutler | Inbox Zero |
|---|---|---|
| Nov 2025 | 3.3% | 0.2% |
| Dec 2025 | 3% | 0.17% |
| Jan 2026 | 3.2% | 0.18% |
| Feb 2026 | 2.8% | 0.19% |
| Mar 2026 | 2.4% | 0.19% |
| Apr 2026 | 3% | 0.19% |
| May 2026 | 2.2% | 0.18% |
| Jun 2026 | 8.9% | 0.24% |
| Jul 2026 | 3.2% | 0.3% |
| Aug 2026 | 10.4% | 0.22% |
| Sep 2026 | 2.7% | 0.24% |
| Oct 2026 | — | — |
How has branded search for Inbox Zero and Mailbutler changed worldwide over the last 12 months?
3 findings
- Mailbutler 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, Mailbutler’s share of searches among AI email assistants worldwide moved from 3.3% to 2.7%, and its estimated monthly branded searches moved from 3.6K to 1.6K.
How did search popularity change for AI email assistants worldwide in September 2026?
2 changes
In September 2026, Mailbutler lost share of searches among AI email assistants worldwide, from 10.4% to 2.7%.
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 Mailbutler’s branded searches counted?
3 search terms
Brandwave collects information about searches that people make online using Inbox Zero’s and Mailbutler’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
Mailbutler
1 branded search term
- mailbutler
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