--- title: "Bitdefender vs Microsoft Defender: Which is searched more?" description: "Is Bitdefender or Microsoft Defender more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Antivirus software 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/categories/antivirus-software/compare/bitdefender-vs-microsoft-defender" publisher: "Brandwave" --- # Bitdefender vs Microsoft Defender: Which is searched more? Is Bitdefender or Microsoft Defender more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Antivirus software 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**: Bitdefender and Microsoft Defender - **Competitive set**: Antivirus software - **Market**: Global - **Month measured**: Sep 2026 - **Bitdefender Share of Search**: 3.8% - **Microsoft Defender Share of Search**: 7.5% ## Is Bitdefender or Microsoft Defender more popular in search? - In September 2026, Microsoft Defender had more branded searches than Bitdefender among antivirus software worldwide. Microsoft Defender had about 181,000 branded searches, while Bitdefender had 90,500. Microsoft Defender made up 7.5% of all antivirus software searches we track, and Bitdefender accounted for 3.8%. - Microsoft Defender was ahead of Bitdefender in every measured month of the 12 months ending September 2026. - Across the 12 months ending September 2026, Bitdefender’s share of searches among antivirus software worldwide moved from 3.1% to 3.8%, and its estimated monthly branded searches held steady at 90.5K. - Across the 12 months ending September 2026, Microsoft Defender’s share of searches among antivirus software worldwide moved from 8.4% to 7.5%, and its estimated monthly branded searches moved from 245K to 181K. ## Top antivirus software in ChatGPT and Google AI Overviews In three ChatGPT questions and one Google AI Overview, both Bitdefender and Microsoft Defender showed up in all four answers. Bitdefender was listed before Microsoft Defender in every answer. 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 | | --- | --- | --- | --- | --- | | Bitdefender | 1st | 3 of 3 | 1 of 1 | 4 of 4 | | Norton | 2nd | 3 of 3 | 1 of 1 | 4 of 4 | | Microsoft Defender | 3rd | 3 of 3 | 1 of 1 | 4 of 4 | | Malwarebytes | 4th | 1 of 3 | 1 of 1 | 2 of 4 | | McAfee | 5th | 0 of 3 | 1 of 1 | 1 of 4 | | ESET | 6th | 2 of 3 | 0 of 1 | 2 of 4 | | Kaspersky | Not ranked | 0 of 3 | 0 of 1 | 0 of 4 | ## Every AI answer about antivirus software - Asked ChatGPT "Which antivirus software should I use?": 1. Bitdefender, 2. Microsoft Defender, 3. Norton, 4. Malwarebytes - Asked ChatGPT "What are the best antivirus software options?": 1. Bitdefender, 2. Norton, 3. Microsoft Defender, 4. ESET - Asked ChatGPT "What's the best antivirus software for a home computer?": 1. Bitdefender, 2. Microsoft Defender, 3. Norton, 4. ESET - Searched Google, AI Overview "antivirus software": 1. Bitdefender, 2. Norton, 3. McAfee, 4. Malwarebytes, 5. Microsoft Defender Not named in any answer: Kaspersky. 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 antivirus software worldwide in September 2026? - In September 2026, Bitdefender gained share of searches among antivirus software worldwide, from 2.7% to 3.8%. - In September 2026, Microsoft Defender lost share of searches among antivirus software worldwide, from 8.1% to 7.5%. ## Month by month | Month | Bitdefender estimated searches | Bitdefender Share of Search | Bitdefender rank | Microsoft Defender estimated searches | Microsoft Defender Share of Search | Microsoft Defender rank | | --- | --- | --- | --- | --- | --- | --- | | Oct 2025 | 90.5K | 3.1% | 5 | 245K | 8.4% | 4 | | Nov 2025 | 74K | 2.7% | 5 | 201K | 7.4% | 4 | | Dec 2025 | 74K | 2.8% | 5 | 201K | 7.5% | 4 | | Jan 2026 | 74K | 2.5% | 5 | 220K | 7.4% | 4 | | Feb 2026 | 60.5K | 2.4% | 5 | 201K | 8% | 4 | | Mar 2026 | 74K | 2.9% | 5 | 201K | 7.9% | 4 | | Apr 2026 | 74K | 3.3% | 5 | 201K | 8.8% | 4 | | May 2026 | 49.5K | 2.2% | 5 | 201K | 9.1% | 4 | | Jun 2026 | 49.5K | 2.4% | 5 | 165K | 8% | 4 | | Jul 2026 | 110K | 5.2% | 5 | 165K | 7.8% | 4 | | Aug 2026 | 60.5K | 2.7% | 5 | 181K | 8.1% | 4 | | Sep 2026 | 90.5K | 3.8% | 5 | 181K | 7.5% | 4 | ## How each brand is measured Brandwave collects information about searches that people make online using Bitdefender’s and Microsoft Defender’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. - **Bitdefender**: Measured on the search term “bitdefender antivirus”. - **Microsoft Defender**: Measured on the search terms “microsoft defender” and “windows defender”, summed into one figure. - [Bitdefender profile](/demand/global-en/brands/bitdefender) - [Microsoft Defender profile](/demand/global-en/brands/microsoft-defender) - [All antivirus software worldwide](/demand/global-en/categories/antivirus-software): The set both shares are measured inside, 7 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 Bitdefender or Microsoft Defender more popular in search? In September 2026, Microsoft Defender had more branded searches than Bitdefender among antivirus software worldwide. Microsoft Defender had about 181,000 branded searches, while Bitdefender had 90,500. Microsoft Defender made up 7.5% of all antivirus software searches we track, and Bitdefender accounted for 3.8%. ## Cite this page Brandwave. "Bitdefender vs Microsoft Defender: Which is searched more?". https://gobrandwave.com/demand/global-en/categories/antivirus-software/compare/bitdefender-vs-microsoft-defender This page is also available as HTML at https://gobrandwave.com/demand/global-en/categories/antivirus-software/compare/bitdefender-vs-microsoft-defender. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.