Braintrust vs Promptfoo:Which is more popular?
In September 2026, Promptfoo had more branded searches than Braintrust among AI evaluation platforms worldwide. Promptfoo had about 22,200 branded searches, while Braintrust had 2,900. Promptfoo made up 8% of all AI evaluation platform searches we track, and Braintrust accounted for 1.1%. When we asked ChatGPT and Google AI Overviews about AI evaluation platforms, Braintrust appeared in four of the five answers and Promptfoo in two. Braintrust was mentioned before Promptfoo in every answer.
Who do people search for more?
Promptfoo, about 8 searches for every 1 for Braintrust
Who does AI mention more?
Braintrust, mentioned in 4 of 5 answers, Promptfoo in 2
Who does AI recommend more?
Braintrust, named ahead of Promptfoo in every answer
Follow Braintrust vs Promptfoo 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, Braintrust was mentioned in four out of five: in all three ChatGPT answers and in one 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. Braintrust was listed before Promptfoo in every answer.
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 Braintrust or Promptfoo more popular in search?
This chart shows how often people search Google for Braintrust 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 Promptfoo, Braintrust. 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 Braintrust and Promptfoo comparison changed over the last 12 months?
3 findings
- Promptfoo was ahead of Braintrust in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Braintrust’s share of searches among AI evaluation platforms worldwide moved from 0.64% to 1.1%, and its estimated monthly branded searches moved from 1.6K to 2.9K.
- 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?
2 changes
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.
Estimated monthly branded searches for Braintrust worldwide rose 81.3% over 12 measured months, from 1.6K to 2.9K in September 2026.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Braintrust’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.
Braintrust
1 branded search term
- braintrust ai
Promptfoo
1 branded search term
- promptfoo
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.