We Tested AI Tutors and Avatar Tools — None Covers Everything 

Before building anything, we wanted to know what already exists. In Part 3 of our Investigate report, Med Rayen reviewed the evidence on 26 tools (with 42 references), and Islem tested seven of them hands-on.

Two families of tools

Educational tools — Quizlet, Khan Academy, Edpuzzle and Google Classroom, Canvas — know how to teach. Khan Academy has mastery levels and a Socratic approach; Canvas manages courses, roles and analytics.

Digital-human tools — Synthesia, D-ID, Tavus, HeyGen — know how to look and sound human. They generate talking avatars, clone voices and, for D-ID and Tavus, hold real-time conversations.

What we observed

• Quizlet’s assistant explains step by step, but declined to “explain in avatars”.
• Khan Academy, Edpuzzle and Google Classroom all work through a class code created by a teacher: availability still depends on the teacher.
• Synthesia generates studio-quality avatar videos and translates them into 140+ languages — but it is built for business, not for e-learning.
• D-ID: we built an interactive “Einstein” agent. It answered every question it received — and it was created without any authorisation step.
• Tavus built a “Math Mentor” for us from a conversation, with its own identity and voice. Its “Socratic” behaviour exists only as a written prompt.
• HeyGen produces lip-synced videos fast, but only from a script and a face — no description of the agent.

The matrix

We compared every tool on eight capabilities our challenge needs: course-grounded knowledge, a mentor persona, real-time voice, an avatar, a learner model, Socratic pedagogy, institutional identity control and learning analytics.

Educational tools cover pedagogy, the learner model and analytics. Avatar tools cover persona, voice and avatar. No tested tool covers every column.

Why it matters for us

A mentor that never says “I don’t know” is a risk in education. Even retrieval-grounded AI tools sold as “hallucination-free” were wrong 17–33% of the time in one study (Magesh et al., 2025). And cost matters: about $21 per hour of live avatar time, against 15–20 TND for an hour of private tutoring in Tunisia.

The conclusion of Part 3 is simple: the missing piece is not another model. It is the combination — grounded, guarded explanations, in the learner’s real language, under the real teacher’s consent and oversight.

See the full matrix in the Investigate tab of our CBL journey.