LangSmith vs Promptfoo:Which is more popular?
In September 2026, LangSmith had more branded searches than Promptfoo among AI testing tools worldwide. LangSmith had about 74,000 branded searches, while Promptfoo had 22,200. LangSmith made up 54% of all AI testing tool searches we track, and Promptfoo accounted for 16.2%. When we asked ChatGPT and Google AI Overviews about AI testing tools, LangSmith and Promptfoo each appeared in two of the five answers. Promptfoo was mentioned before LangSmith in every answer that named either.
Who do people search for more?
LangSmith, about 3 searches for every 1 for Promptfoo
Who does AI mention more?
Both were mentioned in 2 of 5 answers.
Who does AI recommend more?
Promptfoo, named ahead of LangSmith in 2 of 2 answers
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Top AI testing tools in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, LangSmith and Promptfoo were each mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Promptfoo was listed before LangSmith in every answer that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
Mabl3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers- LangSmith2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Promptfoo2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
DeepEval2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Testim2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Momentic2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Applitools1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers
QA Wolf0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about AI testing tools
5 answers
Asked ChatGPT
“Which AI testing tool should I use?”
Asked ChatGPT
“What are the best AI testing tools?”
Asked ChatGPT
“What's the best AI testing tool for automated software tests?”
Searched Google, AI Overview
“ai testing tools”
Searched Google, AI Overview
“best test automation tool”
- 1Mabl
- 1
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 eight AI testing tools 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 | LangSmith | Promptfoo | DeepEval | Applitools | Mabl | Testim | Momentic | QA Wolf |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 55.9% | 7.5% | 9.1% | 5% | 7.5% | 9.1% | 1.8% | 4% |
| Nov 2025 | 54.5% | 8.9% | 8.9% | 4.9% | 7.3% | 8.9% | 2.7% | 3.9% |
| Dec 2025 | 56.9% | 9.3% | 9.3% | 5.1% | 6.2% | 7.6% | 2.2% | 3.3% |
| Jan 2026 | 49.8% | 10% | 10% | 10% | 6.7% | 8.1% | 2% | 3.6% |
| Feb 2026 | 52.2% | 10.4% | 10.4% | 5.7% | 7% | 8.5% | 2% | 3.7% |
| Mar 2026 | 40.7% | 33.3% | 6.7% | 3.6% | 5.4% | 5.4% | 2% | 2.9% |
| Apr 2026 | 52.5% | 15.7% | 8.6% | 4.7% | 5.7% | 7% | 2.1% | 3.6% |
| May 2026 | 57.5% | 14.1% | 9.4% | 3.4% | 5.2% | 5.2% | 1.8% | 3.4% |
| Jun 2026 | 56.1% | 13.8% | 11.2% | 2.7% | 5% | 5% | 2.2% | 3.9% |
| Jul 2026 | 57.9% | 14.2% | 11.6% | 2.8% | 4.2% | 4.2% | 2.3% | 2.8% |
| Aug 2026 | 54% | 16.2% | 13.2% | 2.6% | 4.8% | 3.9% | 2.6% | 2.6% |
| Sep 2026 | 54% | 16.2% | 10.8% | 4.8% | 4.8% | 3.9% | 3.2% | 2.2% |
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 testing tools worldwide moved from 55.9% to 54%, and its estimated monthly branded searches held steady at 74K.
- Across the 12 months ending September 2026, Promptfoo’s share of searches among AI testing tools worldwide moved from 7.5% to 16.2%, and its estimated monthly branded searches moved from 9.9K to 22.2K.
How did search popularity change for AI testing tools worldwide in September 2026?
1 change
Promptfoo’s share of searches among AI testing tools worldwide has gained ground for 3 months in a row, from 13.8% to 16.2% 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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