Koji vs Versive (2026): AI Interviews vs AI-Powered Surveys

TL;DR

Koji and Versive both use AI to collect richer insights than a static survey — but they start from opposite ends. Versive (YC W23) built its name on ‚Äúinterview-quality‚Äù AI surveys: questionnaires that ask intelligent follow-ups, plus voice interviews and AI-persona usability tests. Koji is interview-first: an AI moderator runs a genuine two-way conversation by voice or text, probing up to three follow-ups per topic, then auto-codes the themes and writes the report — starting at €79/month with transparent, self-serve pricing.

If you want to upgrade a survey with smart follow-ups, Versive is a strong, flexible option. If you want the depth of a real customer interview — at survey speed and scale, with structured quant and analysis built in — Koji is the more focused, transparently priced choice.

Koji vs Versive at a glance

| | Koji | Versive | |---|---|---| | Core method | AI-moderated voice & text interviews (interview-first) | AI-powered surveys with follow-ups (survey-first) | | Best for | Founders, PMs, researchers, marketers, agencies | Teams scaling survey-style feedback with depth | | Entry price | €79/month (no contract) | Custom (no public self-serve pricing) | | Conversational depth | AI probes up to 3 follow-ups per question | Smart follow-ups within survey flow | | Quant data | 6 structured question types built in | Structured questions + survey data | | Analysis | Automatic thematic coding + one-click report | Auto-tagging, themes, AI chat on results | | Usability testing | Moderated interview-style walkthroughs | AI-persona usability (Snap) + real-user tests | | Quality control | Quality gate — only valid conversations billed | Standard study limits |

What is Versive?

Versive is a Y Combinator (W23) startup founded by David Carro and Eric Li. Its original insight: traditional surveys are fast but shallow, and interviews are deep but slow — so why not build AI-powered surveys that ask intelligent follow-up questions to collect ‚Äúinterview-quality insights in a fraction of the time‚Äù? Since launch it has expanded into voice interviews, concept and design testing, structured questions, branding customization, AI-powered synthesis for uploaded interviews, and an AI-persona usability product called Snap that simulates usability tests with realistic AI personas.

Versive is genuinely flexible — it spans surveys, interviews, and usability tests, auto-tags transcripts, surfaces themes, and offers an AI chat assistant to query results. It is a capable modern research tool, particularly for teams whose workflow is anchored in surveys they want to make smarter.

What is Koji?

Koji is an AI-native customer research platform built around the conversation, not the questionnaire. You describe your research goal in plain language; Koji‚Äôs AI consultant drafts the brief and interview plan; and an AI moderator conducts the interviews — by voice or text — 24/7 the moment you share a link. It probes up to three follow-up questions per topic, reaching the why the way a skilled human interviewer would. See how AI interviewers work.

Koji combines depth with structure through six structured question types — open-ended, scale, single choice, multiple choice, ranking, and yes/no — so one study yields chartable numbers and coded narrative. After interviews complete, Koji runs automatic thematic analysis (roughly 28x faster than manual coding) and produces a one-click report with themes, quotes, and recommendations.

The core difference: interview-first vs survey-first

Both tools blur the old line between surveys and interviews — but the starting point shapes everything.

Versive starts from the survey. Its core unit is a questionnaire that gets smarter with conversational follow-ups. That is a real improvement over static forms, and it scales beautifully. But a survey-with-follow-ups still frames the interaction as question ‚Üí answer ‚Üí maybe one probe, optimized for breadth.

Koji starts from the interview. Its core unit is a moderated conversation. The AI moderator adapts continuously, follows tangents that matter, and digs up to three layers deep per topic — optimized for depth. When the question you are answering is strategic (why customers churn, whether they will pay, what job your product does for them), that depth is the entire point.

This matters because the market is moving toward conversation: 62% of market researchers now use AI to automate tasks, and 76% use AI for data processing and analysis efficiency, according to recent industry data. The teams pulling ahead are not just sending smarter surveys — they are having more conversations at scale.

On AI personas: Snap vs real interviews

Versive‚Äôs Snap lets you run usability tests with AI personas — synthetic respondents that simulate users. It is fast and useful for early, directional checks. But AI personas have a well-documented ceiling: they reflect training data and assumptions, not the lived reality, surprises, and contradictions of actual customers. Koji is built around interviewing real people at scale — fast enough to feel like a survey, but grounded in genuine human responses. For a deeper look at the trade-off, see AI personas vs real interviews.

Pricing: transparent plans vs custom

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 only pay for conversations that pass a quality check — junk responses are free
• Free tier: 10 credits on signup, no card required

Versive does not publish standard self-serve pricing, so getting an exact number typically means contacting the team. For founders and lean teams who want to start today, Koji’s published pricing removes the friction.

Where each tool wins

Choose Versive if:

• Your workflow is anchored in surveys you want to make conversational
• You want AI-persona usability simulations (Snap) for fast directional checks
• You want a single tool spanning surveys, interviews, and uploaded-recording synthesis

Choose Koji if:

• You need true interview depth — the AI probes up to three follow-ups per topic
• You want AI-moderated voice and text interviews with real customers, not personas
• You want qualitative depth and structured quantitative questions in one study
• You want transparent, self-serve pricing and analysis built in

Speed: from question to a shareable report

Versive and Koji both beat the old survey-then-interview-then-synthesize slog, but the round-trip differs. Versive accelerates the survey: send it broadly, let AI follow up, and review tagged themes. Koji accelerates the conversation: interviews run asynchronously 24/7 the moment you publish a link, and thematic analysis generates as responses arrive, so a study that once took weeks of scheduling and manual coding can close in hours.

There is also a quality dimension. Open-ended survey responses are notorious for one-word answers and drop-off; Koji‚Äôs quality gate means you only pay for conversations that clear a substance bar, and its moderator keeps respondents engaged by reacting to what they actually said. The result is a one-click report with themes, quotes, and recommendations you can drop straight into a roadmap review or board deck — without a researcher manually stitching the narrative together afterward.

The bottom line

Versive is a flexible, modern platform that made surveys meaningfully smarter — a strong fit for survey-led teams. But a smarter survey is still a survey.

Koji is the better choice when you need the depth of a real interview at the speed of a survey. AI-moderated voice and text conversations with real customers, six structured question types, automatic thematic analysis, one-click reports, and transparent pricing from €79/month make it the AI-native platform for discovery, validation, and decisions that actually move the roadmap.

Ready to go deeper? Start with Koji free — describe your goal and get AI-moderated interviews with real customers running in minutes, with no research expertise required.