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Hume AI
✓ verifiedPaid
Voice AI research lab offering emotionally intelligent speech models and APIs for developers building empathic voice applications.
247K visits/mo
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SAM TTS
✓ verifiedFreemium
Free browser-based recreation of the classic Windows Microsoft SAM text-to-speech voice with adjustable pitch and speed.
73K visits/mo
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ttsMP3.com
✓ verifiedFree
Free browser-based text-to-MP3 converter using Amazon Polly voices across 28+ languages with SSML controls.
599K visits/mo
Pricing
No public pricing
Free: $0
No public pricing
Core features
- ✦Empathic, emotionally intelligent voice models
- ✦Human-feedback and evaluation APIs
- ✦Open-source models and datasets
- ✦Coverage of 50+ languages and dozens of emotions
- ✦Expression measurement and speech tooling
- ✦Recreation of classic Microsoft SAM SAPI4 voice
- ✦Multiple voice presets (Sam, Mike, Mary, BonziBUDDY, etc.)
- ✦Adjustable pitch and speed controls
- ✦Client-side generation, no server processing
- ✦WAV file download
- ✦Works across modern browsers without installation
- ✦Text-to-MP3 conversion powered by AWS Polly
- ✦28+ languages and multiple regional accents/voices
- ✦SSML tags for pauses, emphasis, speed, and pitch
- ✦Multi-speaker conversation formatting
- ✦Daily free character limit (~3,000 characters)
Use cases
- →Building empathic voice assistants
- →Measuring emotional expression in speech
- →Running human evaluations of voice models
- →Adding emotional intelligence to apps
- →Recreating nostalgic Windows XP-era text-to-speech audio
- →Generating novelty or meme voice clips
- →Testing SAPI4-style voice output for retro projects
- →Creating narration for e-learning or presentations
- →Adding accessible audio to websites
- →Producing quick voiceovers for YouTube videos
- →Generating multi-character dialogue audio clips
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