15.ai
The research project that popularized AI voice cloning.
About
15.ai was a free, non-commercial web application created by a pseudonymous MIT researcher known as 15, letting users make fictional characters from games, TV, and film speak custom text with emotional inflections. It needed as little as 15 seconds of audio to clone a voice, a claim that gave the project its name.
Launched in March 2020, it became a viral phenomenon in 2021 and is credited as the first platform to popularize AI voice cloning in memes and content creation. The service went offline in September 2022 over copyright complications; a successor called 15.dev launched in May 2025 and closed in May 2026. It remains a landmark entry in the history of generative audio.
What it can do
- Character voice synthesis from 15 seconds of audio
- Emotional inflections via emoji context
- Multi-speaker generation
- Precise pronunciation control
- Pioneered mainstream AI voice cloning
Setup
Defunct; no longer available. Historical entry only.
Prerequisites
None; the service is offline.
Use cases
Works with
Trust score — 7/10
Scored 7/10 (metrics tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 125; Trending score 72/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.