Koji vs Userology (2026): AI Interviews vs Vision-Aware Usability

TL;DR

Koji and Userology are both AI-moderated research platforms, but they are built for different jobs. Userology is a vision-aware usability testing tool — its AI moderator watches users complete tasks on a screen, layering in computer-vision interaction analysis and eye-tracking, and reports task-based metrics like SUS. Koji is an AI-native customer research platform for discovery and decision-making — AI-moderated voice and text interviews that probe the why behind behavior, with automatic thematic analysis and one-click reports, starting at €79/month.

If your core need is task-based usability testing of an interface, Userology is purpose-built for it. If you need to understand customers, validate ideas, dig into churn, or run discovery at speed — across qualitative depth and structured quantitative questions — Koji is the more flexible, transparently priced choice.

Koji vs Userology at a glance

| | Koji | Userology | |---|---|---| | Core method | AI-moderated voice & text interviews (discovery-first) | AI-moderated usability testing (task-first) | | Best for | Founders, PMs, researchers, marketers, agencies | UX teams running interface usability studies | | Entry price | €79/month (no contract) | Custom session-based quote (no public pricing) | | Quant data | 6 structured question types built in | Usability metrics (SUS, task success) | | Analysis | Automatic thematic coding + one-click report | Task synthesis + vision/eye-tracking analysis | | Languages | Multilingual voice & text | 40+ languages | | Setup | Describe your goal, AI drafts the study | Configure tasks + prototype/site | | Quality control | Quality gate — only valid conversations billed | Session-based pricing |

What is Userology?

Userology is an AI-moderated research platform that aims to deliver “the depth of human-moderated insights at the speed of unmoderated testing.” Its standout capability is a vision-aware moderation layer: the AI watches participants interact with a screen using computer-vision interaction analysis and eye-tracking, then synthesizes task-based usability findings with metrics such as the System Usability Scale (SUS). It moderates sessions in 40+ languages across web, iOS, Android, and Figma prototypes, adapting follow-up questions in real time, and taps a recruitment panel spanning millions of users.

Userology is genuinely strong at evaluative usability — answering ‚Äúcan users complete this task, and where do they get stuck?‚Äù Its pricing is custom, session-based quoting with no public rates, which means cost scales roughly linearly with research volume: each additional study is another quote rather than a draw against a disclosed plan.

What is Koji?

Koji is an AI-native customer research platform built around the conversation. You describe your research goal in plain language; Koji‚Äôs AI consultant drafts a research brief and interview plan; and an AI moderator runs the interviews — by voice or text — the moment you share a link. It probes up to three follow-up questions per topic, so you reach the why behind an answer the way a skilled human interviewer would.

Crucially, Koji is not limited to one method. Its six structured question types — open-ended, scale, single choice, multiple choice, ranking, and yes/no — let a single study capture chartable quantitative data alongside rich narrative. When interviews finish, Koji runs automatic thematic analysis (roughly 28x faster than manual coding) and generates a one-click report with themes, verbatim quotes, and recommendations.

The core difference: usability testing vs customer discovery

This is the decision that matters most.

Userology answers usability questions. Put a prototype or live site in front of a user, assign a task, and learn whether they can complete it — augmented by where their eyes went and how they interacted. That is invaluable when you are refining a specific interface.

Koji answers discovery and strategy questions. Why did this customer churn? Would they pay for this concept? What job are they hiring your product to do? What do power users love that casual users miss? These require an open-ended, adaptive conversation — not a task on a screen. Koji‚Äôs AI moderator is built for exactly that, across AI-moderated voice and text interviews.

Most teams need both kinds of insight over a product‚Äôs life. But discovery, validation, churn, pricing, messaging, and win/loss work — the questions that shape what to build and how to sell it — are Koji‚Äôs home turf, and they are far broader than interface usability alone.

Pricing: transparent plans vs custom quotes

Userology does not publish pricing; every engagement is a custom, session-based quote. That can work for large, well-funded UX teams, but it makes budgeting unpredictable and slows down small teams who just want to start.

Koji is transparent and self-serve:

• Insights plan: €29/month (29 credits)
• Interviews plan: €79/month (79 credits)
• Credits: a voice interview costs 3 credits (~€3); a text interview costs 1 credit
• Quality gate: you are only charged for conversations that pass a quality check — low-effort or junk responses are free
• Free tier: 10 credits on signup, no card required

For most teams, Koji’s published pricing means you can run real research this afternoon without a sales call.

Where each tool wins

Choose Userology if:

• Your primary need is task-based usability testing of an interface
• You specifically want eye-tracking and computer-vision interaction analysis
• You have budget for custom, session-based contracts

Choose Koji if:

• You need discovery, validation, churn, pricing, or messaging insight — not just usability
• You want both qualitative depth and structured quantitative data in one study (see the structured questions guide)
• You want AI-moderated voice interviews and transparent, self-serve pricing
• You want analysis and a shareable report built in, with no manual coding

Can Koji do usability testing too?

Yes — Koji can run moderated usability-style interviews where the AI walks a participant through a flow and probes their reactions, and you can pair that with scale and single-choice questions to quantify ease and satisfaction. What Koji does not do is pixel-level eye-tracking or computer-vision gaze analysis. If that specific signal is essential, Userology specializes there. If you want the spoken reasoning behind usability friction plus broader discovery in one platform, Koji covers far more ground.

Speed, languages, and getting to a decision

Both platforms promise speed, but they reach it differently. Userology compresses the usability session — recruiting, moderating, and synthesizing task-based studies faster than a traditional lab. Koji compresses the entire research cycle: because interviews run asynchronously the moment you publish a link, you never wait on calendars, and themes generate automatically as responses land.

For global teams, Userology moderates in 40+ languages, while Koji runs multilingual voice and text interviews with analysis normalized so stakeholders read one coherent report regardless of where respondents are.

The practical test is how fast an insight reaches a decision-maker. With Koji, a founder can frame a churn question in the morning, share the link with departing customers, and open a themed report with verbatim quotes the same afternoon — no moderator scheduling, no manual transcription, no separate analysis pass. That round-trip speed, paired with one-click reports, is what makes continuous discovery realistic for small teams.

The bottom line

Userology is a capable, specialized usability testing platform with a distinctive vision-aware moderation layer. But specialization comes with a narrower scope and opaque, custom pricing.

Koji is the better choice for teams who need to understand customers — not just test interfaces. AI-moderated voice and text interviews, six structured question types, automatic thematic analysis, one-click reports, and transparent pricing from €79/month make it the modern, AI-native platform for discovery, validation, and decision-making at speed.

Ready to try it? Start with Koji free — describe your goal and get your first AI-moderated interviews running in minutes, with no research expertise required.