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This is step three in our step-by-step guide to setting up a study on Prolific.

Video tutorial

What you'll see


Recruit participants

Here you can state how many participants you wish to complete your study. Please note that for a representative sample study (see 'select participants' below) this number must be between 300 to 2000 (US) or 3000 participants (UK). For other study types, you can recruit as many participants as you wish!

Data collection for your study will continue until it has reached this maximum number of complete submissions. You can only ever have this number of submissions active, awaiting review or approved at any one time, but returned, timed out, and rejected submissions are excluded from this total. You can read more about this here: Submission statuses explained. You are able to pause new sign ups for your study during data collection, if required.

You can increase the number of places on your study after launching it on all studies except representative samples, so feel free to launch to a small number of participants at first and then add more places when you're sure that everything is working smoothly. Please see How do I run a pilot study? for further advice.


Here you choose where in the world you would like your participants to be located. Participants were asked the question 'In what country do you currently reside?'. You can choose 'all countries available', USA, UK or see further options by selecting 'more'.

Prolific is only available to participants in certain countries. Please see here for further information: Who are the participants on Prolific?

Study distribution

Here you can choose whether you wish to recruit a representative sample, recruit a balanced sample, apply prescreeners or launch your study to our entire participant pool.

Places on your study will be filled by eligible participants on a first-come, first-served basis. We'll also show you how many participants who meet your criteria have been active on Prolific in the past 90 days. We typically see a 40-50% response rate from eligible participants, however this can vary.

Please see the article Which participants will take my study? for a more detailed look at each of these options.

Representative sample - using this option you can recruit a representative sample of participants in the UK or US.

Balanced sample - using this option you can recruit a sample that is balanced across sex.

Standard sample - using this option you can launch a study to our entire participant pool, or a selected group of participants using prescreening (see below). Please note that if you choose this option your sample will not be balanced in any way.

Prescreen participants

This is where you can apply your chosen selection of our demographic prescreeners to help you to reach your intended audience. Please note that this option is only available for balanced and standard samples.

Can I screen out participants within my study?

No, please do not screen out participants within your studies based on eligibility, or specify screening criteria only within your study title/description. It's very frustrating for participants to get screened out of studies, and our prescreening interface is intended to prevent this! Read more about this here: Can I screen participants within my study?

 Next step: Study cost

 Previous step: Data collection

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