125People ready
to call
Illustrative example. People who may want to take part arrive from study ads on Meta, email campaigns and your CRM or CTMS, and join one list of people ready to call.
Bringing people closer to tomorrow’s medicine
AI-native patient recruitment and retention for clinical trials.
More
encounters.
Less waiting.
Better medicine.
A study starts long before the first visit. Nacar works in the weeks in between, and stays with participants until it ends.
From first interest to the last visit.
Find the people your study needs
Study campaigns reach people who may want to take part. Anyone found in approved hospital data is contacted only after the clinical team has checked.
On a call with Ana · 00:58
Illustrative example. During a call with a candidate, each approved question is checked: aged 18 to 75 matches, psoriatic arthritis needs review by the study team, and can attend visits in Madrid matches.
Talk to every candidate
Nacar calls every candidate, says it is an AI agent and asks the questions your team approved. Your team reviews every call and decides who moves forward.
Visit scheduling
and follow-up
Illustrative example. Ana gets a message with her visit on Tuesday 3 November at 10:30 at Hospital de Madrid, confirms it, the visit is scheduled and she will get a reminder the day before.
Stay close until the study ends
Reminders before each visit and check-ins between them. When someone has a doubt, it reaches the team before it becomes a reason to leave.
Hear the conversation.
See the evidence.
Listen to a pre-screening call and see the report your team would receive.
00:0003:24
Transcript
- AI agent
Hello, I am calling on behalf of the team at Hospital de Madrid. Am I speaking with Alberto T?
- Candidate
Yeah, that’s me.
- AI agent
Before continuing, I would like to inform you that I am an artificial intelligence agent and that I will record this call so that the team can review it. Do you agree?
- Candidate
Yeah, that’s fine.
- AI agent
Thank you. I am calling about the form you completed expressing interest in the Active Psoriatic Arthritis study. I will briefly tell you more about the study and ask you a few questions about your health, which the team will then review. Is that all right?
- Candidate
Sounds perfect. Yeah.
- AI agent
We are conducting a research study to learn about the effectiveness and safety of different doses of a treatment in people with active psoriatic arthritis. If you participate, you will receive the study medication and attend regular check-ups to monitor your health. To start, are you eighteen years of age or older?
- Candidate
Uh, yeah, I am twenty-two.
- AI agent
Understood. Have you been diagnosed with Psoriatic Arthritis for at least three months?
- Candidate
Um, yeah, I have for two years now.
- AI agent
Thank you for confirming that. Do you have at least three swollen joints and three tender joints?
- Candidate
Um, yeah, I have, uh, four actually. My two ankles and my two knees.
- AI agent
All right. Do you currently have cancer or have you had cancer within the last five years?
- Candidate
No, I haven’t.
- AI agent
Thank you. Do you have active plaque psoriasis with at least one plaque that is two centimeters or larger, or nail changes related to psoriasis?
- Candidate
Um, yes, I do actually on my left knee.
- AI agent
Understood. Is your Psoriatic Arthritis still active despite having used at least one conventional DMARD medication?
- Candidate
Um, yeah, actually it is. Yeah.
- AI agent
Thank you. Have you taken apremilast at the approved dose for at least twelve weeks, or have you had to stop taking it due to intolerance?
- Candidate
Yeah, I ha- I have been taking it for the two years I’ve had it. Yeah.
- AI agent
All right. If you are currently taking apremilast, have you been on a stable dose of thirty milligrams or less twice daily for at least twelve weeks?
- Candidate
Um, yeah. Yeah, yeah. Uh, same dose as always, uh, 30 milligrams.
- AI agent
Thank you for that detail. If you are not currently taking apremilast, have you been off this medication for at least four weeks?
- Candidate
I am taking it, so it doesn’t apply.
- AI agent
Understood. Do you have a history or current signs of severe, progressive, or uncontrolled medical conditions affecting your organs or body systems?
- Candidate
Um, no, I haven’t actually.
- AI agent
Thank you. Do you have other inflammatory diseases that might interfere with the evaluation of this study treatment?
- Candidate
Um, no, I don’t, I don’t think I have, no.
- AI agent
All right. Do you have a history of chronic or recurring infectious diseases?
- Candidate
Um, no, I don’t.
- AI agent
Thank you. That is everything from me. Do you have any questions about the study?
- Candidate
Uh, no, I don’t. Thanks.
- AI agent
The team will review your answers and contact you about the next step. Thank you for your time.
- Candidate
Thank you.
- AI agent
Have a great day! Goodbye.
Pre-screening report
-
Matches
Are you 18 years of age or older?
Uh, yeah, I am twenty-two.
-
Matches
Psoriatic arthritis for at least three months?
Um, yeah, I have for two years now.
-
Matches
Do you have active plaque psoriasis or nail changes?
Um, yes, I do actually on my left knee.
Nacar structures the conversation.
Your study team makes the clinical decision.
Built for , and moving clinical trials forward.
Every candidate called within a minute. More people in the trial.
Share of the people who signed up. Times are medians from the original case.
- 13% joined the study
- 15% visited the site
- 26% completed pre-screening
- 76% answered the call
- <1 min
- To the first call
during calling hours - 4 days
- From signup
to visit - 75.5%
- Candidates
reached
Your data stays in Europe.
Every step is auditable.
Built in Europe, for European clinical trials.
- GDPR Health data under Article 9
- EU AI Act Article 50 transparency
- ISO/IEC 27001 Certification in progress
- Always says it is AI Every call starts by saying so, and asks to record.
- Every step auditable Calls, answers and decisions are logged for review.
- People decide Your site team approves every question and every candidate.
- Customer data protected Each customer’s data is kept separate.
- Encrypted data Encrypted in transit, with access controls.
- EU data residency Stored and processed on EU infrastructure.
Found a vulnerability? Read our disclosure policy.
Our mission is to help more people access and advance tomorrow’s medicine.
We want the first conversation someone has about a study to be a good one.
We spent more than a decade building recruitment products. In clinical trials we found the same problem with more at stake: people ready to take part, waiting weeks for a call.
Meet the team behind Nacar
Questions research teams ask us
Something else? Write to us and someone from the team will answer.
What happens if someone says no?
Nothing else. We thank them, record their decision and do not contact them again about that study.
Does the agent say that it is an AI?
Yes. It says so at the start of every call and asks permission to record, as the EU AI Act requires. You can hear it in the demo call above.
Can it be set up for each study?
Yes. Nacar turns each study’s protocol into questions. Your site team edits and approves every one before the first call.
Who decides if a candidate moves forward?
Your study team. Nacar asks the approved questions and records each answer. The team reviews them and makes every decision.
Which languages does the agent speak?
The agent calls each candidate in their own language, with the questions your team approved for the study. Tell us which languages your study needs.
Can results go back to our CRM or spreadsheets?
Yes. Candidates come in from your CRM or a list. Every call ends in a structured report that your team reviews and can take back to the tools it already uses.
Where is the data stored?
On EU infrastructure. Nacar is built GDPR-first, data is encrypted and every action is logged, so it can be audited end to end. ISO/IEC 27001 certification is in progress.
How is Nacar priced?
Per study, based on its scope. Tell us about yours and we will send you a proposal.
Behind every medicine are thousands of people who said yes.
Tell us about your study
We’ll play you a Nacar call and show you the report your team would receive.