Spoke · Recruiting · 8 min read

Recruiting customers for interviews

5 channels compared by cost, quality, and speed. Cold outreach template that gets 5–10% reply rate. The funnel math you need to plan around.

The 5 recruiting channels

Most teams should mix at least 2 channels per research project. Channel mix depends on stage: pre-product = personal network + LinkedIn. Post-MVP = existing customers + paid platforms.

Existing customers

CostFree (or thank-you gift)

QualityHighest — they know your product

Speed1–3 days

Use when:Evaluative or usability work, post-MVP feedback

Pitfall:Bias toward you — they'll say nice things. Weight their feedback accordingly. Ask explicitly: "Tell me what's annoying you."

Personal network

CostFree

QualityHigh but biased — friends are polite

Speed1–7 days

Use when:Very early discovery, before you have access to real ICP

Pitfall:Friends-of-friends in your ICP > friends in your ICP. The further removed, the more honest. Push past initial niceties.

LinkedIn outreach

Cost$0 + your time (or $50–$100 incentive)

QualityMedium-high if targeting + message is right

Speed1–2 weeks

Use when:B2B research, professionals you can't reach via your network

Pitfall:Generic messages get 1–3% reply. Personalized first-line referencing something specific they've posted gets 5–10%. Adding $50–$100 incentive bumps to 15–25%.

Reddit / community channels

CostFree

QualityVariable — communities have different quality bars

Speed3–10 days

Use when:Niche audiences (specific subreddits, IndieHackers, specialized Discords)

Pitfall:Most communities ban DM solicitation. Always read the rules. Always disclose your purpose. Lurk for a week before posting — instant-asker accounts get downvoted.

Paid platforms (User Interviews, Respondent, Prolific)

Cost$50–$200 per qualified session

QualityMedium — depends entirely on screener rigor

Speed1–5 days (fastest for volume)

Use when:Need volume in a hurry; evaluative work where many sessions help

Pitfall:Quality varies. Some respondents are professional research participants giving practiced answers. Vet aggressively in screener — behavioral filter is critical.

Cold outreach template

The template that gets 5–10% reply rate (15–25% with cash incentive). Use for LinkedIn DMs and cold emails.

# COLD OUTREACH TEMPLATE — LinkedIn or Email Subject: 20 minutes? — research about [their domain] Hi [first name], I came across your [post about X / role at Y / talk on Z] and wanted to ask a research question. I'm researching how [their role/team] currently handles [specific problem]. Not pitching anything — just trying to understand the landscape before deciding what to build. Would you be open to a 20-min conversation in the next 2 weeks? Happy to compensate $[amount] for your time, or donate to a charity of your choice if you'd prefer. Either way, no worries if not. Best, [your name] --- WHY THIS WORKS: - "20 minutes" is more achievable than "60 minutes" — easier yes - First line proves you read their work (no spam vibes) - Explicit "not pitching" disarms the sales-radar - Compensation offer signals seriousness, bumps reply rate - "No worries if not" reduces pressure, ironically increases yes rate

The funnel math

Plan around realistic conversion. Founders consistently underestimate how much outreach is needed.

Goal: 15 completed interviews

↓ Reach out to 50 people (warm-cold mix)

↓ ~25 reply (50% reply rate, with personalization + incentive)

↓ ~20 pass screener (80% are actually in ICP)

↓ ~17 schedule (some can\'t fit in calendar)

↓ ~15 actually show up (10–20% no-show rate)

Plan to invite at minimum 3x the number of completed interviews you need. If you only invite 20 people for 15 interviews, you\'ll fall short and have to start over mid-research.

Recruiting takes time. Use it to prep.

While you\'re waiting 2 weeks for replies, run a 30-min GoNoGo session. AI strategist asks the same questions you\'ll ask real prospects, transcript shows where you slipped into pitching. By the time real interviews start, you\'ve already drilled the question rhythm.

Drill the questions free →

30 min · No credit card

Frequently asked questions

What's the realistic reply rate for cold outreach?+

5–10% for warm-cold (you found them in a relevant community, your message references something specific they posted/wrote). 1–3% for fully cold (LinkedIn DM with no shared context). Adding a small cash incentive ($50–100 for a 30-min interview) bumps reply rate to 15–25%. Always personalize the first line.

Should I always pay interviewees?+

For paid platforms (User Interviews, Respondent), yes — they expect $50–$150 per session. For warm intros and existing customers, no payment but send a thank-you gift or product credit. For cold LinkedIn outreach to professionals, offering $50–$100 dramatically improves reply rate. Existing customers who deeply care about your product often refuse payment — let them.

How many people do I need to recruit to get 15 interviews?+

Recruit 30+ candidates to get 15 confirmed interviews. The funnel: 30 invited → 50% reply (15 candidates) → 80% pass screener (12) → 75% show up (9). To get to 15 actual interviews, plan to invite 50+ candidates. Recruiting always takes 2–3x longer than founders expect.