Koji vs. User Interviews: AI Moderation vs. Recruitment Platform

The Bottom Line

User Interviews is a participant recruitment platform — it helps you find and schedule research participants. Koji is an end-to-end research platform that recruits, moderates via AI, transcribes, and synthesizes. If your bottleneck is finding participants and you have moderators ready, User Interviews is useful. If your bottleneck is the entire research process — from recruitment through insight delivery — Koji handles it all.

Platform Overview

User Interviews

User Interviews is a participant recruitment and scheduling platform. It connects researchers with a panel of 3M+ verified participants across demographics, industries, and roles. You post a study, define screening criteria, participants apply, and User Interviews handles scheduling. The actual research — moderation, transcription, analysis — is your responsibility.

Best for: Finding and scheduling research participants when you have your own moderation and analysis workflow

Koji

Koji is an AI-powered research platform that covers the full research lifecycle. It recruits participants, conducts AI-moderated voice interviews following your discussion guide, transcribes every conversation, and synthesizes findings with AI-powered theme analysis. You design the study and interpret the results — Koji handles everything in between.

Best for: Teams that need complete research execution, not just participant sourcing

Head-to-Head Comparison

Where User Interviews Wins

Massive Participant Panel

With 3M+ verified participants, User Interviews has one of the largest research panels available. For hard-to-find demographics or niche professional roles, their panel depth is a genuine advantage.

Method Agnostic

User Interviews provides participants — what you do with them is up to you. Run usability tests, card sorts, focus groups, 1:1 interviews, co-design sessions, or any other method. Koji is focused on voice interviews specifically.

Established Scheduling Workflow

If your team already has moderators, tools, and analysis workflows, User Interviews slots into your existing process. It solves the recruitment problem without changing anything else about how you do research.

Screener Sophistication

User Interviews offers detailed screening surveys to ensure participants match specific criteria. Their panel includes verified professional information that helps filter for B2B research participants.

Where Koji Wins

End-to-End Efficiency

User Interviews solves recruitment. Koji solves research. After finding participants through User Interviews, you still need to moderate interviews (5-10 hours per study), transcribe (2-3 hours), code and analyze (8-15 hours), and synthesize (4-8 hours). Koji handles all of this automatically.

Total researcher time comparison for a 50-participant study:

• User Interviews + manual research: 25-40 hours
• Koji: 4-6 hours (study design + result interpretation)

No Scheduling Required

User Interviews coordinates calendars between you and participants. Koji eliminates scheduling entirely — participants complete AI interviews asynchronously at their convenience. No calendar Tetris, no no-shows, no timezone juggling.

Scale Without Proportional Effort

With User Interviews, moderating 50 interviews takes 5x the effort of moderating 10. With Koji, moderating 500 interviews takes the same effort as moderating 50 — zero, because the AI handles it. Your effort scales with study design complexity, not sample size.

Consistent Interview Quality

Human moderators vary in skill, energy, and bias across interviews. Koji's AI interviewer maintains perfect consistency — every participant gets the same core questions with the same probing depth, eliminating moderator-introduced variability.

Faster Time to Insight

User Interviews delivers participants in 2-5 days. Then you need 2-4 weeks to conduct and analyze interviews. Koji delivers participants AND synthesized insights in 3-7 days total.

Built-In Analysis

User Interviews hands you participants. You return with recordings that need transcription, coding, and analysis. Koji hands you synthesized themes, sentiment analysis, key quotes, and segment breakdowns — ready for stakeholder presentation.

The Real Comparison: Total Cost of Research

User Interviews Approach (50-participant study)

• Recruitment fees: $1,500-3,000
• Participant incentives: $2,500-5,000 (varies by audience)
• Moderator time (50 hrs @ $75/hr): $3,750
• Transcription service: $500-1,000
• Analysis time (20 hrs @ $75/hr): $1,500
• Total: $9,750-14,250
• Timeline: 3-5 weeks

Koji Approach (50-participant study)

• Koji platform: subscription-based
• Participant incentives: comparable
• Study design time (3 hrs): $225
• Result interpretation (3 hrs): $225
• Total: significantly lower
• Timeline: 3-7 days

The difference becomes more dramatic at larger sample sizes. A 200-participant study with User Interviews requires 200 hours of moderation. With Koji, it requires the same 6 hours of your time.

When to Choose What

Choose User Interviews When:

• You need participants for non-interview research (usability testing, card sorting, focus groups)
• You have trained moderators who need to lead conversations personally
• Your research method requires real-time human judgment during sessions
• You need extremely specific participant profiles from a large panel
• You want to use participants across multiple different research methods

Choose Koji When:

• You need interview-based research with depth AND scale
• You lack dedicated moderators or your moderators are at capacity
• Speed to insight is critical
• You want consistent, unbiased interview moderation
• You need AI-powered synthesis across large interview datasets
• Your team needs to do more research with fewer resources

Use Both When:

• You need User Interviews' panel for hard-to-find participants AND Koji's AI moderation for the actual interviews
• You recruit through User Interviews, then send participants to Koji interview links
• You run some studies that require human moderation (via User Interviews) and others that benefit from AI moderation (via Koji)

Switching from User Interviews to Koji

What Changes

• Recruitment: Use Koji's built-in recruitment or import panels (including User Interviews participants via link sharing)
• Moderation: AI handles it — you design the discussion guide instead of moderating live
• Scheduling: Eliminated — participants complete interviews asynchronously
• Analysis: AI synthesis replaces manual coding and theme identification
• Your role: Shifts from executor to strategist — designing studies and interpreting insights

What Stays the Same

• You still need to define research objectives
• You still need participant screening criteria
• You still provide incentives for participation
• You still interpret and apply findings
• You still present insights to stakeholders

Transition Path

1. First study: Run a parallel study — recruit via User Interviews, moderate half with Koji and half yourself
2. Compare quality: Assess whether AI-moderated interviews produce comparable insights
3. Expand: Shift routine studies to Koji, keep User Interviews for specialized recruitment needs
4. Optimize: Develop Koji discussion guide templates for your recurring research types

Frequently Asked Questions

Can I use User Interviews participants with Koji?

Yes. Recruit participants through User Interviews, then share Koji interview links with them. Participants complete the AI interview on their own time. You get User Interviews' panel quality with Koji's moderation and analysis capabilities.

Is User Interviews cheaper than Koji?

User Interviews is cheaper in isolation — but it only solves recruitment. When you add the cost of moderation, transcription, and analysis (your time or a contractor's), the total research cost is typically higher than Koji's end-to-end approach, especially at scale.

Does Koji have its own participant panel?

Koji offers recruitment tools and the ability to import your own panels. For specialized audiences, you can combine Koji with third-party recruitment sources including User Interviews.

What if I need both human and AI moderation?

Use Koji for studies where AI moderation adds value (scale studies, routine research, unbiased feedback collection) and keep User Interviews + human moderation for studies requiring nuanced real-time judgment (sensitive topics, complex workshop-style sessions).

Can Koji match User Interviews' screening capabilities?

Koji supports custom screening questions and participant qualification flows. For most screening needs, Koji's built-in capabilities are sufficient. For extremely granular professional screening (e.g., "oncologists at 200+ bed hospitals who prescribe drug X"), User Interviews' verified panel data may offer an advantage.