Conversational Video AI with Tavus: an avatar you talk to, not a clip you watch
My previous three experiments produced videos to watch. I cloned my voice with ElevenLabs, built a HeyGen digital twin, and turned a technical brief into a Synthesia corporate explainer. Tavus is a different category. It is not a clip you watch. It is an avatar you talk to.
What Tavus actually is, and who it is for
Tavus is built around CVI, its Conversational Video Interface: an API-first platform for real-time, face-to-face AI video conversations over WebRTC. The avatar listens, handles turn-taking, and answers on camera, live. That is the whole point, and it is what separates Tavus from the other tools I tested.
So the audience is different. HeyGen and Synthesia are for teams that need a video produced. Tavus is for products that need an interface: support agents, onboarding and tutoring, intake and screening, interactive FAQ, or, in my case, a scientific spokesperson you can actually question. You do not press play. You have a conversation.
The conversation
The recording below is a real Tavus call: the large frame is the AI replica, the small window is me, live. For this test, the replica spoke as the Kleidos spokesperson. This is the persona I gave it:
Hello, I’m the scientific spokesperson for Kleidos. Kleidos is a biotechnology platform designed to help professionals transform complex biomedical information into structured, evidence-based knowledge. The platform supports the analysis of genetic variants, connects molecular findings with clinical phenotypes, and organizes scientific evidence from specialized sources into consistent and traceable workflows. Rather than replacing clinical expertise, Kleidos helps researchers and healthcare professionals review information more efficiently, maintain data traceability, and improve consistency throughout the interpretation process. Our mission is to enable responsible use of artificial intelligence while keeping scientific rigor, transparency, and human expertise at the center of every decision.
Then I asked it questions, live, and it answered on camera. Three of them, from a longer set:
- What is Kleidos, and who is it designed for?
- How does Kleidos help researchers analyze genetic variants more efficiently?
- Why is consistency in variant interpretation important for biotechnology and clinical research?
The interesting part is not that the answers are correct. It is that they are unscripted and interruptible. The same persona could take a different question next and answer it, on camera, without a new render.
The plans
Pricing changes over time, so verify before purchase. At the time of this test, the developer plans were structured as follows.
| Plan | Price | Conversational video | Custom replica trainings | Concurrent streams |
|---|---|---|---|---|
| Basic | USD 0 | 25 minutes | None (stock replicas only) | 1 |
| Starter | USD 59/mo + usage | 100 minutes | 3 per month | Up to 3 |
| Growth | USD 397/mo + usage | 1,250 minutes | 7 per month | Up to 10 |
| Enterprise | Custom | Custom | Custom | Custom, white-label, SLAs |
The key detail for having your own avatar: the free Basic plan gives you stock replicas but no custom replica training, so a personal replica starts at Starter. Extra conversational minutes are pay-as-you-go beyond the plan allowance, around USD 0.37/min on Starter and USD 0.32/min on Growth.
How the avatar is trained
A Tavus avatar is called a replica, and it is cheap to create. You can build one from a single image, or from about two minutes of training video. The video recipe is simple: roughly one minute of talking followed by one minute of silence in the same clip, where the silent part doubles as the consent segment. The Phoenix rendering engine preserves identity, micro-expressions and emotional nuance. Training runs in the background and the replica is usually ready in about four to six hours. Consent is mandatory, and on the higher tiers the consent workflow can be fully white-labeled.
Tavus vs HeyGen vs Synthesia
After four experiments, the three tools map cleanly to three different modes.
- HeyGen is a digital twin that speaks: multilingual talking-head clips, strong for creator and personal video.
- Synthesia is a corporate explainer: structured, slide-based video for training, onboarding and LMS delivery.
- Tavus is a conversation: a real-time avatar you interrupt and question, built to live inside a product.
The first two produce an asset you distribute. Tavus produces an interface you connect to a script, a knowledge base and a live user.
Takeaway
Tavus answered the question the other tools could not: what happens when the viewer wants to talk back. A Kleidos spokesperson you can interview is not a recording, it is an interface, and it changes what the avatar is for. The tradeoff is honest: real-time conversation is harder than a clean pre-render, so timing, latency and the occasional stumble are where the seams show. But the production model is different in kind. One replica, one persona, one knowledge base, and every viewer gets a slightly different, live answer.