6 ways to recruit research users:

Guerrilla testing: Ask people in public - scary but free

Friends & family: Quick feedback, but biased

Recruitment tools: Prolific/Userbrain - fast but £

Paid ads: ££

In-product: pop ups (need dev time/tools)

CRM: push, email, SMS

My favourite? A mix of all

Duo’s research email hits for 3 reasons:

1) It's concise: fits into the top-of-the fold with 34 words

2) Gives an ETA & goal. Giving a sneak peak into the research

3) It's personal. The language makes it feel targeted 'as a Duolingo learner, you're an expert'

What else?

New year, new pushes:

🦉 Duo keeps it simple with only 8 words in total

🧡 Headspace leans on community language like 'us', 'together' & a 'Ready, Set, Reset Challenge'

🗺️ AllTrails uses a content hook: 25 'must-see' trails of 2025

🥗 Lifesum gives an offer with an adjacent brand, saving £169