Heart
Grade A Kokoro🇺🇸 American English · ♀ Female Voice
About the Heart Voice
Heart is a female American English AI voice rated A on the OfflineTTS quality scale. Speech synthesis runs in your browser with no signup or per-character fees.
Voice character: Warm, Natural
Best for: Storytelling & narration
How to use the Heart voice:
- Open the [TTS tool](/app/?voice=af_heart)
- "Heart" will be automatically selected in the voice picker
- Type or paste your text (up to 50,000 characters per batch)
- Click generate — speech is created locally on your device
- Download as studio-quality WAV or compact MP3
Quality rating explained: A indicates this is a top-tier voice with natural prosody and expressive inflection suitable for professional production.
The Heart voice uses Kokoro's browser phonemizer and local WebGPU or WebAssembly synthesis. After the initial model download, English generation works completely offline.
Explore other American English voices or browse the [complete voice library](/voice/) for your project.
Best For: Storytelling & narration
Heart's warm, natural tone makes it ideal for storytelling, audiobooks, educational content, and any project that needs a friendly, engaging voice.
Generate speech with Heart now →Related Voices
Heart Voice — Frequently Asked Questions
Is the Heart voice free to use?
Yes. The Heart voice is completely free. It runs in your browser with no API key, no signup, and no subscription limits. Generate as much speech as you need at zero cost.
Does the Heart voice work offline?
Yes. After the initial model download is cached in your browser, the Heart voice can generate speech completely offline without internet connectivity.
What quality rating does the Heart voice have?
The Heart voice is rated A on our quality scale. This is our highest rating — it produces natural, expressive speech suitable for professional production use.
Can I export WAV and MP3 with Heart?
Yes. After generating speech with Heart, you can download uncompressed 24kHz WAV files for studio editing or compressed MP3 files for sharing and publishing.
Can I use the Heart voice for commercial projects?
Yes. The models used on OfflineTTS support commercial content creation. You can use generated audio in YouTube videos, podcasts, audiobooks, and commercial voice-overs.
Ready to use Heart?
Experience natural American English speech synthesis in your browser with zero setup or character fees.
Open Heart Voice in TTS Studio →