LangSmith vs Promptfoo:Which is more popular?
In September 2026, LangSmith had more branded searches than Promptfoo among AI evaluation platforms worldwide. LangSmith had about 74,000 branded searches, while Promptfoo had 22,200. LangSmith made up 26.8% of all AI evaluation platform searches we track, and Promptfoo accounted for 8%. When we asked ChatGPT and Google AI Overviews about AI evaluation platforms, LangSmith appeared in three of the five answers and Promptfoo in two. LangSmith was mentioned before Promptfoo in three out of four answers.
Who do people search for more?
LangSmith, about 3 searches for every 1 for Promptfoo
Who does AI mention more?
LangSmith, mentioned in 3 of 5 answers, Promptfoo in 2
Who does AI recommend more?
LangSmith, named ahead of Promptfoo in 3 of 4 answers
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Top AI evaluation platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, LangSmith was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Promptfoo was mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. LangSmith was listed before Promptfoo in three out of four answers.
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 LangSmith or Promptfoo more popular in search?
This chart shows how often people search Google for LangSmith and Promptfoo 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 LangSmith, Promptfoo. 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 LangSmith and Promptfoo comparison changed over the last 12 months?
3 findings
- LangSmith was ahead of Promptfoo in every measured month of the 12 months ending September 2026.
- 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.
- Across the 12 months ending September 2026, Promptfoo’s share of searches among AI evaluation platforms worldwide moved from 4% to 8%, and its estimated monthly branded searches moved from 9.9K to 22.2K.
How did search popularity change for AI evaluation platforms worldwide in September 2026?
1 change
Promptfoo’s share of searches among AI evaluation platforms worldwide has gained ground for 3 months in a row, from 7.3% to 8% in September 2026.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using LangSmith’s and Promptfoo’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.
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