Koji vs PlaybookUX: AI-Moderated Customer Research vs Unmoderated UX Testing (2026)

Quick answer: Koji and PlaybookUX solve different research problems. PlaybookUX is built for unmoderated usability testing — you write tasks, recruit from a 6M-person panel, and watch screen recordings of people clicking through your product. Koji is built for AI-moderated customer research interviews — an AI voice or text interviewer asks open-ended questions, probes follow-ups in real time, and synthesizes hundreds of conversations into themes automatically. If you want to know what users do on a flow, choose PlaybookUX. If you want to know why they do it, what they want, and what would make them pay, choose Koji.

This guide breaks down both platforms across methodology, pricing, AI capabilities, analysis depth, and the use cases each one wins.

TL;DR Comparison

| Dimension | Koji | PlaybookUX | | --- | --- | --- | | Core method | AI-moderated voice & text interviews | Unmoderated usability testing | | AI interviewer | Yes — two-way conversational AI | No — task prompts only (AI personas via add-on) | | Probing follow-ups | Automatic, real-time | None (preset task instructions) | | Question types | 6 structured types + open conversation | Task prompts, surveys, card sort, tree test | | Participant panel | BYO + global recruiter integrations | 6M+ vetted participants | | Thematic analysis | Automatic across all interviews | Manual tagging + AI summaries | | Multilingual | 30+ languages with native voice | English + select languages | | Free plan | Yes — 1 study, 5 interviews/month forever | 14-day trial (no forever-free) | | Starting paid price | €29/mo (Insights) | $5,400/year (Scale plan) | | Best for | Customer discovery, JTBD, churn, pricing, message testing | Click-through usability, task completion, prototype testing |

What PlaybookUX Is (and Where It Shines)

PlaybookUX is a usability testing platform launched as an affordable alternative to UserTesting. According to its own pricing page, it supports unmoderated and moderated usability tests, card sorting, tree testing, surveys, first-click testing, five-second testing, and preference testing across desktop, tablet, and mobile.

Its standout asset is the 6 million-person participant panel, which means you can launch a test in the morning and have a dozen screen-recorded sessions back the same day. PlaybookUX also added Synthetic Participants in 2025 — AI personas grounded in your past video research that you can deploy in new studies — and it integrates with data warehouses, CRMs, and internal tools.

The pricing on PlaybookUX is structured into three tiers: a Pay-as-you-go option for ad-hoc tests, Scale at $5,400/year (billed annually) for card sorting, tree testing, and recruitment, and Pro at $8,800/year that adds approval flow, custom consent forms, invisible observers, and SSO + SAML. Enterprise pricing is custom.

PlaybookUX is the right choice when you need to:

• Watch people use a clickable prototype or live site
• Run a card sort or tree test on your information architecture
• Validate that a redesigned flow actually reduces friction
• Test five-second first impressions of landing pages
• Recruit a large, vetted panel quickly without building your own

What Koji Is (and Where It Shines)

Koji is the AI-native customer research platform. Instead of giving participants a task and watching them click, Koji runs two-way AI-moderated interviews — voice or text — where an AI interviewer asks your discussion guide questions, listens to answers, and probes for the "why" in real time with follow-up questions. The AI never gets tired, never leads the witness, and runs hundreds of interviews in parallel.

Where PlaybookUX captures behavior, Koji captures meaning. You learn why a customer almost churned, which job they "hired" your product to do, what they would pay, which message resonates, and what would make them recommend you. After interviews complete, Koji automatically synthesizes:

• Thematic clusters traceable back to every quote
• Quality scores per interview
• Sentiment and emotion analysis
• Pain points, feature requests, and key insights
• A one-click research report ready to share with stakeholders

Koji supports 6 structured question types — open-ended, scale, single-choice, multiple-choice, ranking, and yes/no — that mix seamlessly with conversational follow-ups. See the structured questions guide for how teams combine them.

Pricing is built for accessibility: a Free forever plan with 1 study and 5 interviews per month, an Insights plan at €29/mo, an Interviews plan at €79/mo, and a Pro plan at €99/mo. Overage is €1 per interview credit, with no annual commitments required.

Koji is the right choice when you need to:

• Run customer discovery interviews at the speed of insight
• Validate pricing without hiring a pricing consultant
• Understand the real reasons customers churn (not just "price")
• Test value propositions and positioning messages
• Run Jobs-to-Be-Done switch interviews at scale
• Conduct in-language research across 30+ markets

Head-to-Head: 7 Decision Factors

1. Research Method

PlaybookUX: Task-based. You write instructions ("Find a blue jacket and add it to your cart"). Participants complete the task while their screen and voice are recorded. You watch playback to find usability friction.

Koji: Conversation-based. You write a discussion guide. Koji's AI moderator asks the questions, probes deeper based on each answer, and adapts the conversation to what each participant says. The output is a transcribed interview with synthesized themes.

Verdict: PlaybookUX wins for behavioral observation. Koji wins for qualitative depth and motivation.

2. AI Capabilities

This is where the gap is widest. PlaybookUX added AI personas in 2025 (Synthetic Participants), and offers AI-assisted summaries of session recordings. The AI helps after the test — it doesn't moderate the test itself.

Koji's AI is the moderator. It conducts the interview, decides when to probe deeper, adapts to non-answers, and handles tangents gracefully. After interviews finish, the same AI synthesizes patterns across every conversation, generates AI-powered insights, and writes the report. See AI-moderated vs human-moderated interviews for why this matters.

Verdict: Koji is AI-native end-to-end. PlaybookUX bolts AI onto a traditional usability testing pipeline.

3. Pricing & Plan Flexibility

PlaybookUX's lowest paid tier (Scale) costs $5,400 billed annually — roughly $450/month commitment. There is a pay-as-you-go option for individual tests, but ongoing research locks you into a yearly contract.

Koji starts at €0 forever (5 interviews/month), with paid plans from €29/mo to €99/mo. No annual commitment required. For comparison, see the user research budget template.

Verdict: Koji is 90%+ cheaper for teams running ongoing discovery research. PlaybookUX makes more sense if you specifically need its 6M panel.

4. Recruitment

PlaybookUX includes recruitment from its 6M-person panel as part of paid plans. You can filter by demographics, occupation, behaviors, and tech use.

Koji is BYO participants by default — you bring your customer list, NPS detractors, churned users, free trial signups, or sales prospects. For broader recruitment, Koji integrates with panels like Respondent and User Interviews (see participant recruitment platforms). Koji is also ideal for customer-base research where panel recruitment misses the point.

Verdict: PlaybookUX wins for recruiting strangers fast. Koji wins for actual customer research.

5. Analysis Depth

PlaybookUX gives you video recordings, transcripts, heatmaps, click paths, and AI-assisted highlight clips. Analysis is largely manual — you watch sessions and tag insights.

Koji automatically synthesizes themes, pain points, sentiment, quality scores, and feature requests across every interview. Researchers describe going from raw interviews to a polished report in hours rather than weeks. The turning interviews into insights guide walks through the workflow.

Verdict: Koji is dramatically faster for qualitative synthesis. PlaybookUX is better if you specifically need session replay analysis.

6. Multilingual Reach

PlaybookUX supports English and select major languages.

Koji conducts AI-moderated voice and text interviews in 30+ languages with native voice models — useful for global product teams running discovery in non-English markets.

Verdict: Koji is the clear winner for multilingual research.

7. Use Case Fit

| If your question is… | Use… | | --- | --- | | "Can users find the checkout button?" | PlaybookUX | | "Why did 30% of trial users not convert?" | Koji | | "Does the new IA match users' mental model?" | PlaybookUX (tree test) | | "What would make customers pay 2x?" | Koji | | "Which onboarding screen confuses people?" | PlaybookUX | | "Why are enterprise customers churning?" | Koji | | "Does the new homepage hero communicate value in 5 seconds?" | PlaybookUX (five-second test) | | "What jobs are customers hiring our product to do?" | Koji (JTBD interviews) |

The Real Difference

PlaybookUX is the right tool for UX teams testing interfaces. Koji is the right tool for product, founder, marketing, and research teams uncovering customer truth at scale.

Most growth-stage companies need both — but they need them for different jobs. The mistake is paying $5,400/year for PlaybookUX and then trying to use task prompts to figure out why customers churn, or paying for an enterprise survey platform and trying to extract motivation from a 5-point Likert scale. Those tools were not built for those questions.

Koji was built specifically for the why. Voice or text. Open-ended or structured. 5 interviews or 500. In any of 30+ languages. With automatic synthesis that makes the time to insight feel almost unreasonable.

When to Use Both Together

A common workflow we see at growth-stage SaaS companies:

1. PlaybookUX runs unmoderated usability tests on the redesigned checkout flow → identifies a friction point at the address step
2. Koji runs follow-up AI interviews with users who abandoned at that step → reveals that the friction isn't UX, it's a trust gap around how billing is described
3. Marketing rewrites the trust copy, design adds a clarification microcopy → conversion lifts

Behavior tells you where the problem is. Conversations tell you what the problem actually is.

Try Koji Free

If your team's research questions look more like "why did they churn," "what would they pay," or "what job are they hiring us to do," — Koji is the right starting point. The free plan covers 1 study and 5 interviews/month forever, with no credit card. Most teams launch their first study in under 20 minutes and have synthesized insights in 24-48 hours.

Start your first AI-moderated study free →

For more context, see best AI user research tools 2026, our usability testing guide, and customer discovery interviews for founders.