Langfuse vs LangSmith:Which is more popular?
In September 2026, Langfuse had more branded searches than LangSmith among AI evaluation platforms worldwide. Langfuse had about 110,000 branded searches, while LangSmith had 74,000. Langfuse made up 39.8% of all AI evaluation platform searches we track, and LangSmith accounted for 26.8%. When we asked ChatGPT and Google AI Overviews about AI evaluation platforms, Langfuse and LangSmith each appeared in three of the five answers. LangSmith was mentioned before Langfuse in two out of three answers that named either.
Who do people search for more?
Langfuse, about 49% more searches than LangSmith
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
LangSmith, named ahead of Langfuse in 2 of 3 answers
Follow Langfuse vs LangSmith and get free monthly updates on what changed
By continuing you'll get index updates and occasional product news from Brandwave. Unsubscribe any time. Privacy
Top AI evaluation platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Langfuse and LangSmith were each mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. LangSmith was listed before Langfuse in two out of three answers that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Braintrust1st- LangSmith2nd
- Langfuse3rd
Arize4th
Weights & Biases5th
Promptfoo6th
Patronus AI–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Arize4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Braintrust4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Langfuse3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- LangSmith3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Weights & Biases2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Promptfoo2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Patronus AI0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about AI evaluation platforms
5 answers
Asked ChatGPT
“Which AI evaluation platform should I use?”
Asked ChatGPT
“What are the best AI evaluation platforms?”
Asked ChatGPT
“What's the best AI evaluation platform for llm teams?”
Searched Google, AI Overview
“ai evaluation platforms”
Searched Google, AI Overview
“ai model evaluation”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Langfuse or LangSmith more popular in search?
This chart shows how often people search Google for Langfuse and LangSmith by name. Each line represents a brand's share of searches for all seven AI evaluation platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for Langfuse, LangSmith. The figures are in the table below the chart.
View monthly share of searches table
| Month | Langfuse | LangSmith | Weights & Biases | Promptfoo | Arize | Patronus AI | Braintrust |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 29.5% | 29.5% | 31.8% | 4% | 4% | 0.65% | 0.64% |
| Nov 2025 | 29.5% | 29.5% | 31.8% | 4.8% | 3.2% | 0.53% | 0.64% |
| Dec 2025 | 29.6% | 29.6% | 30.5% | 4.8% | 4% | 0.65% | 0.76% |
| Jan 2026 | 33.5% | 27.4% | 28.2% | 5.5% | 3.7% | 0.6% | 1.1% |
| Feb 2026 | 35% | 28.6% | 25.2% | 5.7% | 3.8% | 0.74% | 0.93% |
| Mar 2026 | 29.9% | 24.6% | 21.6% | 20.1% | 2.7% | 0.66% | 0.52% |
| Apr 2026 | 32.8% | 27% | 27.8% | 8.1% | 3% | 0.72% | 0.72% |
| May 2026 | 34.8% | 28.7% | 24.1% | 7% | 3.8% | 0.77% | 0.76% |
| Jun 2026 | 36.2% | 29.8% | 21.4% | 7.3% | 3.3% | 1.2% | 0.79% |
| Jul 2026 | 37.7% | 31% | 18.3% | 7.6% | 3.4% | 1.2% | 0.82% |
| Aug 2026 | 39.5% | 26.6% | 18.3% | 8% | 5.3% | 1.3% | 1% |
| Sep 2026 | 39.8% | 26.8% | 18.6% | 8% | 4.4% | 1.3% | 1.1% |
How has the Langfuse and LangSmith comparison changed over the last 12 months?
3 findings
- Langfuse was ahead of LangSmith in every measured month of the 12 months ending September 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, LangSmith’s share of searches among AI evaluation platforms worldwide moved from 29.5% to 26.8%, and its estimated monthly branded searches held steady at 74K.
How did search popularity change for AI evaluation platforms worldwide in September 2026?
1 change
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.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Langfuse’s and LangSmith’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.
Other head-to-heads among AI evaluation platforms
Put your own brand in this comparison
Brandwave tracks your branded demand next to the rival you actually watch, with your campaigns, spend and outcomes on the same timeline.