Short answer: BuildBetter.ai and Koji solve two different halves of customer research. BuildBetter is AI call intelligence — it records, transcribes, and mines the meetings you already run (sales calls, support calls, the occasional user interview) to surface themes. Koji is an AI-native research platform — it conducts the interviews for you, running AI-moderated voice and text conversations at scale, then analyzes them automatically. BuildBetter helps you get more out of conversations you already had. Koji helps you have far more of the right conversations in the first place. If you only have a handful of calls, you have an analysis problem. If you can't get enough calls, you have a data-generation problem — and that's where most teams are stuck.
What each tool actually does
BuildBetter.ai
BuildBetter is "AI for product teams." It auto-records or ingests audio/video, produces highly accurate transcripts (~97%) in 17+ languages, and uses a Signals feature to find recurring themes and pain points across all your interactions, plus Workflows to automate insight delivery. It's enterprise-ready (SOC 2 Type 2, GDPR, HIPAA) and pricing starts at a $49/mo Hobby plan with no per-seat charges (BuildBetter, 2026). Its sweet spot: a PM-led team that already sits on a pile of recorded calls and wants those calls mined automatically.
The catch: BuildBetter is retrospective. It can only analyze conversations you've already scheduled, staffed, and run. The bottleneck in customer research is rarely the analysis — it's getting enough quality conversations on the calendar.
Koji
Koji removes that bottleneck. It's an AI-native customer research platform that runs AI-moderated voice and text interviews for you, 24/7, with no scheduling and no human moderator. You write the brief, Koji's AI interviewer conducts adaptive conversations — probing follow-ups in real time when an answer is interesting — and then runs automatic thematic analysis into a one-click report. It supports six structured question types (open_ended, scale, single_choice, multiple_choice, ranking, yes_no) so each interview captures both qualitative depth and quantitative signal. Plans start at €29/mo (Insights) and €79/mo (Interviews).
In other words: BuildBetter analyzes the data you manually collected. Koji generates the data — and analyzes it. See how AI interviewers work and AI interviews vs surveys.
Head-to-head comparison
| Capability | Koji | BuildBetter.ai |
|---|---|---|
| Conducts interviews for you | ✅ AI-moderated voice & text, at scale | ❌ Analyzes calls you run yourself |
| Net-new primary research | ✅ Generates fresh data on demand | ❌ Retrospective only |
| Adaptive follow-up probing | ✅ Real-time, per respondent | ⚠️ Limited to what was said on the call |
| Structured questions | ✅ 6 types | ❌ Free-form transcripts only |
| Automatic thematic analysis | ✅ | ✅ (Signals) |
| One-click reports | ✅ | ✅ (Workflows) |
| Transcription | ✅ | ✅ ~97%, 17+ languages |
| No scheduling / no moderator bias | ✅ | ❌ Human-run calls |
| Scale | Hundreds of interviews in parallel | Limited by how many calls you can run |
| Entry price | €29/mo | $49/mo |
When BuildBetter.ai is the right call
BuildBetter is a genuinely strong tool if:
- Your team already runs high call volume (sales, CS, support) and wants those recordings mined automatically
- You need bot-free, locally-processed recording across many meeting tools
- Your primary user is a PM drowning in operational call admin (BuildBetter cites teams cutting ops time from ~75% to under 30%)
- You're consolidating call notes, not running structured studies
It's an AI notetaker and call-intelligence layer — and a good one. Compare similar tools in best AI notetakers for user research, Koji vs Fathom, and Koji vs Otter.ai.
When Koji is the right call
Koji is the better choice when:
- You need more conversations than your team can physically run — Koji conducts hundreds in parallel
- You want structured, repeatable studies (discovery, concept tests, churn, win/loss) rather than ad-hoc call mining
- You need net-new research on a question your existing calls never covered
- You want no moderator bias and consistent, adaptive probing every single time
- You need insight in hours, not weeks — from question to report without a researcher in the loop
The fundamental gap: BuildBetter makes you a better listener to conversations you already had. Koji makes sure those conversations happen — at the volume and consistency real decisions require. For the methodology, see AI interview best practices, thematic analysis, and building a voice-of-customer program.
The bigger picture: generate vs. analyze
Legacy and even modern call-intelligence tools assume the conversations exist. For most product, research, and growth teams in 2026, they don't — not enough of them, not on the right questions, not consistently. That's the structural reason teams are moving to AI-native research: instead of squeezing more from a thin pile of calls, Koji manufactures the primary research itself. 10x faster insights, no research expertise required, from question to insight in hours.
You can even pair them — use Koji to generate structured interviews and a notetaker like BuildBetter to capture live sales calls. But if you have to pick one tool to actually move the needle on how much customer truth your team has, generating the conversations beats analyzing the few you managed to book.
Want to stop waiting on calls to happen? Start a free Koji study and run your first AI-moderated interview today.
