SpecialistAll-in-one mobile and web video editor equipped with built-in AI avatar and captioning tools.
#1HeyGen records 7,000,070 monthly visits with +9.4% month-over-month growth and Freemium pricing. Tunk.ai records 0 monthly visits with -100% growth and Free Trial, Contact for Pricing pricing.

Voice AI agents and real-time speech-to-text for production call automation
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | app.heygen.com | tunk.ai |
| Pricing Model | Freemium | Free Trial, Contact for Pricing |
| Monthly Visits | 7M (7,000,070) | 0 (0) |
| MoM Traffic Delta |
| +599.16K (+9.4%) |
| -3.37K (-100%) |
| Primary Market & Share | 🇺🇸 United States (18.5%) | 🌐 Global (—) |
|---|
| Direct Visits / mo | 4.1M | 0 |
|---|
| User Rating | 4.8 | 4.2 |
|---|
| Supported Platforms | Website | Website |
|---|

Turn scripts into studio-quality AI avatar videos in minutes
Choose from 500+ stock presenters, use photo avatars, or train a custom Video Avatar that looks and sounds like you, then generate narrated videos straight from a script.
Localize one recording into 175+ languages and dialects with editable scripts, brand glossaries, voice switching and proofreading seats for native-language review.
An agentic workflow expands ideas into finished videos, with access to leading generative models for video and image generation on higher plans.
Add quizzes, branching and decision points, embed videos by link, and export SCORM packages so content drops straight into corporate learning systems.

Voice AI agents and real-time speech-to-text for production call automation
Describe an agent in plain English and the platform sets up the voice, prompts, knowledge and call flow; then test, refine and deploy to a phone line, an app or the API.
Streaming transcription returns text while the caller is still speaking, covering dozens of languages and accents through the API or the built-in playground.
Hand the agent your own endpoints so it can book, look up and update records mid-call, then write the outcome back to Salesforce, HubSpot or Zoho.
Connect Twilio or Plivo, point a campaign at your contact list, and let the agent handle every call while you manage only the queue.
SpecialistAll-in-one mobile and web video editor equipped with built-in AI avatar and captioning tools.
#1SpecialistProvides industry-leading voice cloning and speech synthesis for realistic avatar narration.
#2SpecialistOffers browser-based video creation with AI avatar and voice generation tools.
Provides accessible AI avatar video creation and talking-head templates, featuring a generous free tier but simpler editing tools.
Industry-leading AI avatar creator focusing on corporate training and presentations, though with a different template selection and pricing structure.

Real-time voice AI models and agents you can build on
Real-time speech-to-text, text-to-speech and voice agents in one API platform

AI communication platform for sales and support teams

SpecialistSpecializes in interactive conversational video agents with personalized memory, going beyond HeyGen's pre-rendered presenter videos.
Build, test, and deploy production-grade voice AI agents over API
Focuses on real-time conversational digital humans and talking-head videos, offering stronger interactive capabilities than HeyGen's studio builder.

Speech-to-text and voice intelligence APIs for developers
SpecialistAll-in-one mobile and web video editor equipped with built-in AI avatar and captioning tools.
SpecialistProvides industry-leading voice cloning and speech synthesis for realistic avatar narration.
SpecialistOffers browser-based video creation with AI avatar and voice generation tools.
Provides accessible AI avatar video creation and talking-head templates, featuring a generous free tier but simpler editing tools.
Industry-leading AI avatar creator focusing on corporate training and presentations, though with a different template selection and pricing structure.
Real-time speech-to-text, text-to-speech and voice agents in one API platform
SpecialistSpecializes in interactive conversational video agents with personalized memory, going beyond HeyGen's pre-rendered presenter videos.
Build, test, and deploy production-grade voice AI agents over API
Focuses on real-time conversational digital humans and talking-head videos, offering stronger interactive capabilities than HeyGen's studio builder.