We build online medical research studies

Eureka is a non-profit resource out of the University of California San Francisco. We make it easy to answer surveys and contribute data from apps, devices, and other novel sources for research. It’s never been easier to make an impact!

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FOR RESEARCHERS

We build many types of studies

Intervention studies

Randomize your participants to different study arms.

Rare disease studies

Overcome geographic barriers to participation with an online study.

Long-term registries

Develop a longitudinal well-characterized cohort.

Pilot studies

Get your idea in front of participants quickly.

Ecological Momentary Assessment

Trigger surveys at the right time.

Device studies

Test a new device or collect novel data from our available integrations.

Multi-center trials

Coordinate study management. Collect data all in one place.

FOR RESEARCHERS

An all-in-one platform

1

Participant Enrollment

We can customize eligibility surveys, digital consent, randomization, and more to allow your participants to easily enroll in your study.
2

Data Collection and Participant Experience

Allow your participants to easily answer surveys, connect devices, and link medical records. Your study design can be customized and participant experience can be personalized. Notify participants of available activities with reminder messages. Our expert team has years of experience to help you optimize participation.
3

Study Management

Easily view the progress of your participants through your study, add new sites, and manage consent documents on our admin panel. Specify admin team roles across sites secured by two-factor authentication.
4

Data Storage and Reports

All data is stored in our secure, HIPAA-compliant cloud storage. Download clean data in universal formats like CSV with your data ready for analysis.
Explore our platform

See our studies

Health eHeart

Health eHeart is an ambitious study to end Heart Disease. It only takes a few minutes to make a big difference. Anyone can join — whether you have Heart Disease or not.

Learn More about Health eHeart

COVID-19 Citizen Science

A large study tracking COVID-19 infections and risk factors. Anyone 18 years old or older can participate, even if you are healthy.

Learn More about CCS

eNET

Doctors at UCSF are collecting information to learn about quality of life, symptoms, lifestyle, and well-being for patients with neuroendocrine tumors. This study invites people with neuroendocrine tumors to join.

Learn More about ENet
See all studies

Our Recent Writings

January 6, 2026
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Welcome Denver Health!

By | MCNAIR
Welcome, Denver Health Cardiology! Welcome to the MCNAIR Study, Denver Health Cardiology! On September 3rd, 2025, Denver Health launched enrollment at their site. We are so excited to work with you!...
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Publications

Predictors of incident viral symptoms ascertained in the era of COVID-19.

Gregory M. Marcus et al.

Gregory M. Marcus, Jeffrey E. Olgin, Noah D. Peyser, Eric Vittinghoff, Vivian Yang, Sean Joyce, Robert Avram, Geoffrey H. Tison, David Wen, Xochitl Butcher, Helena Eitel, Mark J. Pletcher.

PLoS One. 2021.
In the absence of universal testing, effective therapies, or vaccines, identifying risk factors for viral infection, particularly readily modifiable exposures and behaviors, is required to identify effective strategies against viral infection and transmission…

HLA-B*15:01 is associated with asymptomatic SARS-CoV-2 infection.

Danillo G. Augusto et al.

Danillo G. Augusto, Tasneem Yusufali, Noah D. Peyser, Xochitl Butcher, Gregory M. Marcus, Jeffrey E. Olgin, Mark J. Pletcher, Martin Maiers, Jill A. Hollenbach.

medRxiv. 2021.
Background: Evidence has shown that a large proportion of SARS-CoV-2 infected individuals do not experience symptomatic disease. Owing to its critical role in immune response, we hypothesized that variation in the human leukocyte antigen (HLA) loci may underly asymptomatic infection…

Factors Associated With Access to and Timing of Coronavirus Testing Among US Adults After Onset of Febrile Illness.

Mark J. Pletcher et al.

Mark J. Pletcher, Jeffrey E. Olgin, Noah D. Peyser, Madelaine Faulkner Modrow, Feng Lin, Jeffrey Martin, Thomas Carton, Alexis L. Beatty, Eric Vittinghoff, Gregory M. Marcus.

JAMA Netw Open. 2021.
Question: How often do persons with new febrile illness access coronavirus testing and receive a test result within 7 days of illness onset?

See all publications