Koji vs Respondent.io: AI-Native Research Platform vs Participant Recruitment Marketplace (2026)

If you're comparing Koji and Respondent.io, you're probably trying to figure out how to run more customer interviews without burning your entire research budget. But these two tools solve fundamentally different parts of the research problem — and understanding that distinction will save you weeks of wasted effort.

The short answer: Respondent.io recruits participants for you. Koji conducts the interviews, analyzes the data, and generates reports — automatically. They aren't direct competitors in the traditional sense. But if your current stack is Respondent.io + Zoom + manual analysis, Koji replaces everything after the recruitment step, and often the recruitment step too.

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What Respondent.io Actually Does

Respondent.io is a participant marketplace. You describe who you want to talk to, set an incentive, and Respondent sources qualified people from their panel. Their key strength is B2B participant targeting: filter by job title, industry, company size, seniority, and behavior.

Here's the typical Respondent workflow:

1. Create a research project and write screener questions
2. Set participant incentives ($50–$200 for B2C, $100–$500 for B2B)
3. Wait for applicants to pass your screening
4. Schedule and conduct interviews yourself (usually via Zoom)
5. Transcribe conversations manually or export to a third-party tool
6. Code transcripts, identify themes, and write the report

What Respondent.io does not do:

• Conduct or moderate the interviews
• Transcribe or analyze conversations
• Extract themes or surface insights
• Generate research reports
• Scale to large sample sizes affordably

You remain the moderator, analyst, and report writer. Respondent is the middleman between you and your participants.

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Respondent.io Pricing: The Real Cost

Respondent.io charges per completed session:

| Participant Type | Per Session | Annual Plan (60 sessions) | |---|---|---| | B2C | $39–$40 | $1,980/year | | B2B | $65–$80 | $3,300–$6,000/year |

But that's just the Respondent platform fee. Add participant incentives ($50–$200 for consumer, $100–$500 for professional) and your true cost per B2B interview easily hits $200–$700 — before you account for your own time moderating, transcribing, and analyzing.

Traditional in-depth interviews, including moderator prep, session time, transcription, and analysis, typically cost $500–$1,500 per conversation according to market research industry benchmarks. Respondent.io helps with recruitment, but everything downstream remains manual.

For 20 B2B interviews, you're looking at $4,000+ in Respondent fees alone, plus weeks of analyst time.

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What Koji Does Differently

Koji is an AI-native research platform designed to replace the entire manual research stack: participant management, interview moderation, analysis, and reporting.

The Koji workflow for the same 20-interview study:

1. Set up your study — Define research questions using one of 6 structured question types (open-ended, scale, single choice, multiple choice, ranking, yes/no). Each type determines how analysis extracts answers and how the report visualizes data.
2. Import participants — Upload your CRM list via CSV or share a public interview link. No scheduling required.
3. AI conducts the interviews — Koji's AI moderator runs each conversation in text or voice, asking follow-up probing questions and handling the full session without a human in the loop.
4. Automatic analysis — After each interview, Koji extracts structured answers, detects themes, and tags key insights. No manual transcript coding.
5. One-click report — Generate a shareable research report with thematic analysis, charts, participant quotes, and aggregated quantitative data — in minutes, not weeks.

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The Core Difference: Recruitment Marketplace vs Full Research Platform

| Capability | Respondent.io | Koji | |---|---|---| | Participant sourcing from panel | ✓ | — | | B2B participant targeting filters | ✓ | — | | Import your own customer list | — | ✓ | | AI-moderated interviews | — | ✓ | | Voice interview capability | — | ✓ | | Automatic transcription | — | ✓ | | Thematic analysis | — | ✓ | | 6 structured question types | — | ✓ | | Quantitative + qualitative combined | — | ✓ | | One-click research reports | — | ✓ | | Report publishing and sharing | — | ✓ | | Platform cost per interview | $39–$80 + incentive | 3 credits (~€3) |

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The Scale Problem Respondent.io Can't Solve

Respondent.io is designed for 5–20 interviews. That's by design — human-moderated interviews don't scale economically or operationally.

Koji is built for 5 or 5,000. Because the AI handles moderation, you can run 100 voice interviews simultaneously without a researcher present. Analysis runs automatically. The aggregate report generates from all responses.

Research data tells a compelling story about AI-moderated research:

• Voice AI produces responses 4–5× longer than typed surveys, and participants share 20× more words than they would on a form
• 83% of respondents report greater honesty with AI interviewers compared to human moderators — because there's no social pressure to give the "correct" answer
• AI-moderated interviews deliver insights 100× faster and at 75% lower cost than traditional moderated approaches

For product teams who need to talk to customers continuously — not just in quarterly research sprints — Koji makes weekly customer interviews operationally feasible. For teams using Respondent.io today, the question to ask is: how much researcher time am I spending after the participant walks into the session?

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When to Use Respondent.io vs Koji

Use Respondent.io when:

• You need hard-to-reach B2B professionals you don't have access to (enterprise IT leaders, C-suite executives, niche industry specialists)
• You're conducting highly sensitive or complex research where a human moderator builds rapport that AI can't replicate
• You have budget for premium participant sourcing and a dedicated researcher to handle moderation and analysis

Use Koji when:

• You want to talk to your own customers, users, or churned prospects — and already have their contact details
• You need research at scale (20+ interviews) without research team overhead
• You need insights in hours, not weeks
• You're a startup founder, PM, or small research team without dedicated research ops
• You want quantitative and qualitative data from the same conversation

The best combined workflow: Use Respondent.io to source specialized participants you wouldn't otherwise reach. Share your Koji interview link with those participants so the AI moderates the sessions automatically and generates analysis. You get targeted recruitment plus automated research — the best of both platforms.

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Real Cost Comparison: 20 B2B Research Interviews

| Approach | Recruitment | Interviews | Analysis | Total | |---|---|---|---|---| | Respondent.io + Zoom + manual analysis | $1,600 fees + $2,000+ incentives | $0 | 60–80 hrs analyst time | $3,600+ cash + significant time | | Koji (own customer list) | $0 | 60 credits (~€60) | Automatic | ~€60 | | Respondent recruitment + Koji AI sessions | $1,600 + incentives | 60 credits (~€60) | Automatic | $1,600 + small credit cost |

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Start Running AI-Moderated Interviews Today

Respondent.io helped teams solve a real problem: finding the right people to talk to. But research doesn't end at the recruitment step. Moderation, transcription, analysis, and reporting take weeks — Koji handles all of it automatically.

If you're spending hours on manual transcript analysis or waiting weeks for research reports, start a free Koji study and see how AI interviews change your research workflow.

Related: Importing participants via CSV · Managing research participants · How structured question types work