How popular isCastor?
In September 2026, people searched for Castor by name about 4,400 times worldwide, an 18.5% decrease from the previous year. These searches made up 1% of all global clinical trial software searches, placing Castor seventh out of seven brands. When we asked both ChatGPT and Google AI Overviews about clinical trial software, Castor appeared in two of the five answers and was the fourth most recommended of the seven.
Castor is the seventh most searched of 7 competitors and the fourth most recommended in AI answers.
IQVIAShare of searches 57%Mentioned in 0 of 5 AI answersPlace in AI recommendations –
VeevaShare of searches 17.1%Mentioned in 4 of 5 AI answersPlace in AI recommendations 2nd
ClarioShare of searches 9.4%Mentioned in 0 of 5 AI answersPlace in AI recommendations –
MedidataShare of searches 9.4%Mentioned in 5 of 5 AI answersPlace in AI recommendations 1st
CastorShare of searches 1%Mentioned in 2 of 5 AI answersPlace in AI recommendations 4th
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Top clinical trial software in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Castor was mentioned in two out of five: in two of the three ChatGPT answers, but not in either of the two Google AI Overviews. Castor is the fourth most recommended of the seven.
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.
- Medidata5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Veeva4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
REDCap2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers- Castor2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Oracle Health1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers- IQVIA0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Clario0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about clinical trial software
5 answers
Asked ChatGPT
“Which clinical trial platform should I use?”
Asked ChatGPT
“What are the best clinical trial platforms?”
Asked ChatGPT
“What's the best clinical trial platform for a clinical research team?”
Searched Google, AI Overview
“clinical trial software”
Searched Google, AI Overview
“clinical research software”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Which clinical trial software compete with Castor?
Share of searches by month for IQVIA, Veeva, Clario, Medidata, REDCap, Castor. The figures are in the table below the chart.
View monthly share of searches table
| Month | IQVIA | Veeva | Clario | Medidata | REDCap | Oracle Health | Castor |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 56.2% | 13.8% | 13.8% | 9.3% | 3.4% | 2.3% | 1.2% |
| Nov 2025 | 60.9% | 12.3% | 12.3% | 8.2% | 3% | 2% | 1.3% |
| Dec 2025 | 57.6% | 14.2% | 11.6% | 9.5% | 3.5% | 2.3% | 1.3% |
| Jan 2026 | 57.7% | 14.2% | 11.6% | 9.5% | 3.5% | 2.3% | 1.3% |
| Feb 2026 | 59% | 14.5% | 9.7% | 9.7% | 3.6% | 2.4% | 1.1% |
| Mar 2026 | 56.9% | 14% | 11.5% | 9.4% | 4.2% | 2.8% | 1.2% |
| Apr 2026 | 58.4% | 14.4% | 9.6% | 9.6% | 4.3% | 2.4% | 1.3% |
| May 2026 | 55.5% | 16.7% | 11.2% | 9.1% | 4.1% | 2.2% | 1.2% |
| Jun 2026 | 52% | 19.1% | 10.5% | 10.5% | 4.7% | 2.1% | 1.1% |
| Jul 2026 | 52% | 19.1% | 10.5% | 10.5% | 4.7% | 2.1% | 1.1% |
| Aug 2026 | 53.6% | 19.7% | 10.8% | 8.8% | 3.9% | 2.2% | 0.96% |
| Sep 2026 | 57% | 17.1% | 9.4% | 9.4% | 4.2% | 1.9% | 1% |
| Rank | Brand | Share of searches | Estimated monthly branded searches | vs prior month | Share change |
|---|---|---|---|---|---|
| 1, held 1st | 57% | 246K | +22.4% | +3.4 points | |
| 2, held 2nd | 17.1% | 74K | 0% | -2.6 points | |
| 3, held 3rd | 9.4% | 40.5K | 0% | -1.4 points | |
| 4, held 4th | 9.4% | 40.5K | +22.4% | +0.6 points | |
| 5, held 5th | 4.2% | 18.1K | +22.3% | +0.2 points | |
| 6, held 6th | 1.9% | 8.1K | 0% | -0.3 points | |
| 7, held 7th | 1% | 4.4K | +22.2% | +0.1 points |
1.
IQVIA57%
Held 1st. 246K estimated branded searches, +22.4% vs prior month. Share +3.4 points.
2.
Veeva17.1%
Held 2nd. 74K estimated branded searches, 0% vs prior month. Share -2.6 points.
3.
Clario9.4%
Held 3rd. 40.5K estimated branded searches, 0% vs prior month. Share -1.4 points.
4.
Medidata9.4%
Held 4th. 40.5K estimated branded searches, +22.4% vs prior month. Share +0.6 points.
5.
REDCap4.2%
Held 5th. 18.1K estimated branded searches, +22.3% vs prior month. Share +0.2 points.
1.9%
Held 6th. 8.1K estimated branded searches, 0% vs prior month. Share -0.3 points.
7.
Castor1%
Held 7th. 4.4K estimated branded searches, +22.2% vs prior month. Share +0.1 points.
Compare popularity between Castor and its closest rivals
Every comparison with Castor
6 comparisons
How has branded search demand for Castor changed worldwide over the last 12 months?
2 findings
- Across the 12 months ending September 2026, estimated monthly branded searches for Castor worldwide fell from 5.4K to 4.4K.
- Across the 12 months ending September 2026, Castor’s share of searches among clinical trial software worldwide held steady, from 1.2% to 1%.
How did search popularity change for clinical trial software worldwide in September 2026?
6 changes
In September 2026, IQVIA gained share of searches among clinical trial software worldwide, from 53.6% to 57%.
In September 2026, Medidata gained share of searches among clinical trial software worldwide, from 8.8% to 9.4%.
In September 2026, Veeva lost share of searches among clinical trial software worldwide, from 19.7% to 17.1%.
In September 2026, Clario lost share of searches among clinical trial software worldwide, from 10.8% to 9.4%.
Estimated monthly branded searches for REDCap worldwide rose 22.3% over 12 measured months, from 14.8K to 18.1K in September 2026.
Estimated monthly branded searches for Castor worldwide fell 18.5% over 12 measured months, from 5.4K to 4.4K in September 2026.
How are Castor’s branded searches counted?
1 search term
Brandwave collects information about searches that people make online using Castor’s name. When viewed over time, estimated search volumes for this branded term can be used to understand whether interest in the brand is growing, holding steady, or fading.
- castor edc
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