--- title: "Langfuse vs Weights & Biases: Which is searched more?" description: "Is Langfuse or Weights & Biases more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the AI evaluation platforms 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/ai-evaluation-platforms/compare/langfuse-vs-weights-biases" publisher: "Brandwave" --- # Langfuse vs Weights & Biases: Which is searched more? Is Langfuse or Weights & Biases more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the AI evaluation platforms 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**: Langfuse and Weights & Biases - **Competitive set**: AI evaluation platforms - **Market**: Global - **Month measured**: Sep 2026 - **Langfuse Share of Search**: 39.8% - **Weights & Biases Share of Search**: 18.6% ## Is Langfuse or Weights & Biases more popular in search? - In September 2026, Langfuse had more branded searches than Weights & Biases among AI evaluation platforms worldwide. Langfuse had about 110,000 branded searches, while Weights & Biases had 51,300. Langfuse made up 39.8% of all AI evaluation platform searches we track, and Weights & Biases accounted for 18.6%. - The lead changed hands once in the 12 months ending September 2026: Langfuse took it in January 2026. - Across the 12 months ending September 2026, Langfuse’s share of searches among AI evaluation platforms worldwide moved from 29.5% to 39.8%, and its estimated monthly branded searches moved from 74K to 110K. - Across the 12 months ending September 2026, Weights & Biases’ share of searches among AI evaluation platforms worldwide moved from 31.8% to 18.6%, and its estimated monthly branded searches moved from 79.6K to 51.3K. ## Top AI evaluation platforms in ChatGPT and Google AI Overviews In three ChatGPT questions and two Google AI Overviews, Langfuse was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Weights & Biases was mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Langfuse was listed before Weights & Biases in every answer that named either. 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 | | --- | --- | --- | --- | --- | | Braintrust | 1st | 3 of 3 | 1 of 2 | 4 of 5 | | LangSmith | 2nd | 3 of 3 | 0 of 2 | 3 of 5 | | Langfuse | 3rd | 3 of 3 | 0 of 2 | 3 of 5 | | Arize | 4th | 3 of 3 | 1 of 2 | 4 of 5 | | Weights & Biases | 5th | 2 of 3 | 0 of 2 | 2 of 5 | | Promptfoo | 6th | 1 of 3 | 1 of 2 | 2 of 5 | | Patronus AI | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | ## Every AI answer about AI evaluation platforms - Asked ChatGPT "Which AI evaluation platform should I use?": 1. LangSmith, 2. Braintrust, 3. Langfuse, 4. Arize - Asked ChatGPT "What are the best AI evaluation platforms?": 1. Braintrust, 2. LangSmith, 3. Langfuse, 4. Arize, 5. Weights & Biases, 6. Promptfoo - Asked ChatGPT "What's the best AI evaluation platform for llm teams?": 1. Braintrust, 2. Langfuse, 3. LangSmith, 4. Arize, 5. Weights & Biases - Searched Google, AI Overview "ai evaluation platforms": 1. Braintrust, 2. Arize, 3. Promptfoo - Searched Google, AI Overview "ai model evaluation": named none of the brands we track Not named in any answer: Patronus AI. 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 evaluation platforms worldwide in September 2026? - Langfuse’s share of searches among AI evaluation platforms worldwide has gained ground for 3 months in a row, from 36.2% to 39.8% in September 2026. - Estimated monthly branded searches for Weights & Biases worldwide fell 35.6% over 12 measured months, from 79.6K to 51.3K in September 2026. ## Month by month | Month | Langfuse estimated searches | Langfuse Share of Search | Langfuse rank | Weights & Biases estimated searches | Weights & Biases Share of Search | Weights & Biases rank | | --- | --- | --- | --- | --- | --- | --- | | Oct 2025 | 74K | 29.5% | 2 | 79.6K | 31.8% | 1 | | Nov 2025 | 74K | 29.5% | 2 | 79.9K | 31.8% | 1 | | Dec 2025 | 74K | 29.6% | 2 | 76.2K | 30.5% | 1 | | Jan 2026 | 90.5K | 33.5% | 1 | 76.2K | 28.2% | 2 | | Feb 2026 | 90.5K | 35% | 1 | 65.2K | 25.2% | 3 | | Mar 2026 | 110K | 29.9% | 1 | 79.6K | 21.6% | 3 | | Apr 2026 | 110K | 32.8% | 1 | 93.1K | 27.8% | 2 | | May 2026 | 110K | 34.8% | 1 | 76.2K | 24.1% | 3 | | Jun 2026 | 110K | 36.2% | 1 | 65K | 21.4% | 3 | | Jul 2026 | 110K | 37.7% | 1 | 53.3K | 18.3% | 3 | | Aug 2026 | 110K | 39.5% | 1 | 51.1K | 18.3% | 3 | | Sep 2026 | 110K | 39.8% | 1 | 51.3K | 18.6% | 3 | ## How each brand is measured Brandwave collects information about searches that people make online using Langfuse’s and Weights & Biases’ 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. - **Langfuse**: Measured on the search term “langfuse”. - **Weights & Biases**: Measured on the search terms “wandb”, “weights and biases” and “weights biases”, summed into one figure. - [Langfuse profile](/demand/global-en/brands/langfuse) - [Weights & Biases profile](/demand/global-en/brands/weights-biases) - [All AI evaluation platforms worldwide](/demand/global-en/categories/ai-evaluation-platforms): 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 Langfuse or Weights & Biases more popular in search? In September 2026, Langfuse had more branded searches than Weights & Biases among AI evaluation platforms worldwide. Langfuse had about 110,000 branded searches, while Weights & Biases had 51,300. Langfuse made up 39.8% of all AI evaluation platform searches we track, and Weights & Biases accounted for 18.6%. ## Cite this page Brandwave. "Langfuse vs Weights & Biases: Which is searched more?". https://gobrandwave.com/demand/global-en/categories/ai-evaluation-platforms/compare/langfuse-vs-weights-biases This page is also available as HTML at https://gobrandwave.com/demand/global-en/categories/ai-evaluation-platforms/compare/langfuse-vs-weights-biases. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.