Bill

Bill is a male American English AI voice rated B on the OfflineTTS quality scale. Speech synthesis runs in your browser with no signup or per-character fees.

Voice character: Audiobook, Warm

Best for: Storytelling & narration

Quality rating explained: B is a catalog discovery label, not a measured MOS score, a public leaderboard position, or a guarantee for your script. Audition names, numbers, pacing, and chunk joins before publishing.

The Bill voice runs on Pocket TTS (100M parameter model) with on-device audio synthesis. After model assets download, speech is generated locally in your browser.

Preview transcript: the sample player above reads: “This is a LibriVox recording. All LibriVox recordings are in the public domain. For more information or to volunteer, please visit LibriVox.org.” Listen to that clip before generating your own text; it is the shortest way to judge pronunciation, pace, and whether the American English phonemization path fits your script.

Reviewing American English text with this preset: American English is stress-timed, so an unnatural emphasis can make an otherwise clean render sound wrong. Check contractions, acronyms (spoken as letters or as a word), dates, and dollar amounts, and keep one sentence per line when a long script starts to drift.

Grade context: A B grade describes a usable preset that benefits from a short audition. Expect the occasional clipped word or uneven emphasis that a script edit can fix.

What the browser downloads: Pocket TTS bundles about 146 MB of assets and runs a 100M parameter model in the tab. The first generation downloads the bundle, later visits reuse the browser cache, and clearing site data removes it.

Asset identity: this preset maps to the cached asset fingerprint kybill, so it can be told apart from a same-named voice on another engine even when the label in the picker looks identical.

Other American English voices: Heart (female, grade A), Bella (female, grade A-), Nicole (female, grade B-). Switching between them on the same sentence is the fastest way to hear whether one suits the script better.

Explore other American English voices or browse the complete voice library for your project.