Ediphi AI Interview App — Avatar Architecture & Cost Analysis
Technical evaluation: Cloud-Rendered Video (Azure) vs. Open-Source 3D (WebGL) vs. Modern Sound Orbs (Gemini / Grok / Siri).
🎙️ Interactive Avatar Studio & Switcher
Switch between all 4 open-source client-side models live. Test real-time speech animation, conversational pacing, and lip-sync with zero video compute fees.
🔄 100% Shared Gemini Voice Backend
ENGINE: THREE.JS (WEBGL)
⚡ 60 FPS · 320ms LATENCY · $0.00 VIDEO BILL
😊 Mode: Welcoming & Rapport Building
Option 1: TalkingHead.js (WebGL 3D Engine)
Pure client-side WebGL engine built on Three.js. Automatically maps incoming Gemini audio stream to 3D facial visemes (blendshapes: A, E, I, O, U) directly on student GPUs with natural eye blinks and head gestures.
- Real-Time Lip-Sync: Browser Web Audio analyzes voice and automatically moves 3D mouth blendshapes (visemes: A, E, I, O, U) on student GPU.
- Natural Motion: Real-time eye blinks, breathing animations, and subtle head tilts in browser.
- $0.00 Video Compute: Renders directly on student hardware with zero cloud video bills.
Rendering Architecture:
Client GPU (Three.js WebGL)
Model Download Size:
< 3.5 MB (GLB format)
Lip-Sync Technique:
Facial Blendshapes (ARKit/Oculus)
Cloud Video Cost:
$0.00 (Pure Local Compute)
Gemini Audio Stream:
2.0¢ / completed interview
Executive Cost & Architecture Comparison
Per-interview unit economics: Microsoft Azure Legacy Cloud Video vs. Ediphi 3D Model / WebGL (Open Source Models) & Fluid Sound Orb.
1. Per-Interview Cost by Duration (3–5 Min Reality)
Direct comparison based on actual student interview sessions (3 to 6 questions each)
| Interview Type | Length | Microsoft Azure Video | Ediphi (3D Model / Sound Orb) |
|---|---|---|---|
|
Quick Screening
3–4 introductory questions
|
3 Mins | $1.62 | $0.015 (1.5¢) Save $1.60 (99%) |
|
Standard Mock Interview AVERAGE
5–6 situational & behavioral questions
|
4 Mins | $2.16 | $0.020 (2.0¢) Save $2.14 (99%) |
|
In-Depth Mock Interview
7–8 hospitality competency questions
|
5 Mins | $2.70 | $0.025 (2.5¢) Save $2.67 (99%) |
|
Comprehensive Exam
10–12 questions + competency grading
|
10 Mins | $5.40 | $0.050 (5.0¢) Save $5.35 (99%) |
2. Architectural Reason (Why Ediphi is 99% Cheaper)
Cloud GPU video generation vs. Free client-side WebGL / Canvas rendering
| Architecture Layer | Microsoft Azure Video Avatar | Ediphi (3D Model / Sound Orb) |
|---|---|---|
|
Visual / Video Rendering
Cloud GPU vs. Local Device GPU
|
$0.500 / min
$30/hr cloud GPU video encoding
|
$0.000 / min
Free local WebGL 3D model or Canvas
|
|
Speech & AI Intelligence
STT + LLM Logic + Voice Audio
|
$0.040 / min
Separate Azure STT + GPT-4o + TTS
|
$0.005 / min
Unified Gemini Multimodal Live Audio
|
| TOTAL RUNTIME / MINUTE | ~$0.540 / min | ~$0.005 / min (108x cheaper) |
3. Real-World Monthly Volume Simulator: Ediphi Live Scale
Current production baseline: ~500 completed mock interviews / month across 3,000 enrolled students
Ediphi Live Production Scale
3,000 Enrolled Students · ~500 Monthly Interviews
In actual university and vocational tracks, students interview during checkpoint evaluations or job-placement season. With ~500 completed interviews monthly (~4 minutes each):
Total Cost a Month (Ediphi)
$10.00 / mo
Azure Video: $1,080 / mo
Quick Volume Presets:
Unit Economics per Interview:
$0.02 (2.0¢) on Ediphi
vs.
$2.16 on Azure
Total Monthly Traffic:
2,000 mins/mo (500 interviews @ 4 min)
Total Cost a Month (Azure Realistic Video)
$1,080 / mo
$2.16 per interview
Total Cost a Month (Ediphi Next-Gen)
$10.00 / mo
$0.02 (2.0¢) per interview