--- title: "Inbox Zero vs Shortwave: Which is more popular?" description: "Is Inbox Zero or Shortwave more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the AI email assistants set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time." canonical: "https://gobrandwave.com/demand/global-en/compare/inbox-zero-app-vs-shortwave" publisher: "Brandwave" --- # Inbox Zero vs Shortwave: Which is more popular? Is Inbox Zero or Shortwave more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the AI email assistants set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time. ## Key facts - **Compared**: Inbox Zero and Shortwave - **Competitive set**: AI email assistants - **Market**: Global - **Month measured**: Sep 2026 - **Inbox Zero Share of Search**: 0.24% - **Shortwave Share of Search**: 1% ## Is Inbox Zero or Shortwave more popular in search? - In September 2026, Shortwave had more branded searches than Inbox Zero among AI email assistants worldwide. Shortwave had about 590 branded searches, while Inbox Zero had 140. Shortwave made up 1% of all AI email assistant searches we track, and Inbox Zero accounted for 0.24%. - Shortwave 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, Shortwave’s share of searches among AI email assistants worldwide moved from 0.58% to 1%, and its estimated monthly branded searches moved from 640 to 590. ## Top AI email assistants in ChatGPT and Google AI Overviews In three ChatGPT questions and two Google AI Overviews, Shortwave 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. Shortwave was listed before Inbox Zero in four out of five answers. Brands get a higher AI rank if they are mentioned earlier in the answers that list options. | Brand | AI rank | ChatGPT answers that named it | Google AI Overviews that named it | All answers that named it | | --- | --- | --- | --- | --- | | Superhuman | 1st | 3 of 3 | 2 of 2 | 5 of 5 | | Fyxer AI | 2nd | 2 of 3 | 1 of 2 | 3 of 5 | | Shortwave | 3rd | 3 of 3 | 2 of 2 | 5 of 5 | | Inbox Zero | 4th | 3 of 3 | 0 of 2 | 3 of 5 | | SaneBox | 5th | 0 of 3 | 1 of 2 | 1 of 5 | | Mailbutler | 6th | 0 of 3 | 1 of 2 | 1 of 5 | ## Every AI answer about AI email assistants - Asked ChatGPT "Which AI email assistant should I use?": 1. Fyxer AI, 2. Superhuman, 3. Shortwave, 4. Inbox Zero - Asked ChatGPT "What are the best AI email assistants?": 1. Fyxer AI, 2. Superhuman, 3. Shortwave, 4. Inbox Zero - Asked ChatGPT "What's the best AI email assistant for a busy inbox?": 1. Inbox Zero, 2. Superhuman, 3. Shortwave - Searched Google, AI Overview "ai email assistants": 1. Superhuman, 2. Fyxer AI, 3. Shortwave - Searched Google, AI Overview "email productivity tool": 1. Superhuman, 2. Shortwave, 3. SaneBox, 4. Mailbutler Brands are listed in the order each answer named them. The answers were collected in the United States on October 20, 2026. ## How did search popularity change for AI email assistants worldwide in September 2026? - In September 2026, Shortwave lost share of searches among AI email assistants worldwide, from 3.1% to 1%. - Estimated monthly branded searches for Inbox Zero worldwide fell 36.4% over 11 measured months, from 220 to 140 in September 2026. ## How has branded search for Inbox Zero and Shortwave changed worldwide over the last 12 months? | Month | Inbox Zero estimated searches | Inbox Zero Share of Search | Inbox Zero rank | Shortwave estimated searches | Shortwave Share of Search | Shortwave rank | | --- | --- | --- | --- | --- | --- | --- | | Nov 2025 | 220 | 0.2% | 6 | 640 | 0.58% | 5 | | Dec 2025 | 160 | 0.17% | 6 | 770 | 0.8% | 5 | | Jan 2026 | 200 | 0.18% | 6 | 1.2K | 1% | 5 | | Feb 2026 | 200 | 0.19% | 6 | 1.3K | 1.3% | 5 | | Mar 2026 | 230 | 0.19% | 6 | 2.2K | 1.8% | 5 | | Apr 2026 | 180 | 0.19% | 6 | 1.6K | 1.7% | 5 | | May 2026 | 160 | 0.18% | 6 | 800 | 0.91% | 5 | | Jun 2026 | 180 | 0.24% | 6 | 620 | 0.83% | 5 | | Jul 2026 | 180 | 0.3% | 6 | 1.5K | 2.5% | 5 | | Aug 2026 | 140 | 0.22% | 6 | 2K | 3.1% | 5 | | Sep 2026 | 140 | 0.24% | 6 | 590 | 1% | 5 | | Oct 2026 | — | — | — | — | — | — | ## How are Inbox Zero’s and Shortwave’s branded searches counted? Brandwave collects information about searches that people make online using Inbox Zero’s and Shortwave’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**: Measured on the search terms “getinboxzero” and “inbox zero ai”, summed into one figure. - **Shortwave**: Measured on the search terms “shortwave ai” and “shortwave ai email assistant”, summed into one figure. - [Inbox Zero profile](/demand/global-en/brands/inbox-zero-app) - [Shortwave profile](/demand/global-en/brands/shortwave) - [All AI email assistants worldwide](/demand/global-en/categories/ai-email-assistants): The set both shares are measured inside, 6 brands. ## Methodology - [How is the Brand Demand Index measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused. ## Frequently asked questions ### Is Inbox Zero or Shortwave more popular in search? In September 2026, Shortwave had more branded searches than Inbox Zero among AI email assistants worldwide. Shortwave had about 590 branded searches, while Inbox Zero had 140. Shortwave made up 1% of all AI email assistant searches we track, and Inbox Zero accounted for 0.24%. ## Cite this page Brandwave. "Inbox Zero vs Shortwave: Which is more popular?". https://gobrandwave.com/demand/global-en/compare/inbox-zero-app-vs-shortwave This page is also available as HTML at https://gobrandwave.com/demand/global-en/compare/inbox-zero-app-vs-shortwave. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.