Synthetic voice & chat,
without boundaries.
The most comprehensive, simple-to-use platform for building adult AI. Chat, voice, calls, text, and email — all behind one API. Live in minutes.
Powering NSFW conversations for 100+ brands and hundreds of thousands of people.
Everything people do, your AI does
One engine across every channel — with shared memory, personas, and guardrails.
Chat
Real-time text conversations with memory and personality.
Voice calls
Cloned, natural voices on live phone calls.
SMS / Text
Two-way texting on real numbers.
Web
Drop-in chat and voice widgets for any site.
Inboxes that hold a conversation on their own.
One API
Every channel, every persona, behind a single key.
The API is the product
Sign up, grab a key, and ship. No sales call required to start — pay per use, scale when you're ready. Personas, memory, retrieval, and moderation are built in.
curl https://api.sinth.ai/v1/chat \ -H "Authorization: Bearer sinth_live_…" \ -d '{ "persona": "luna", "message": "hey there" }' # → { "reply": "mmm hey you. been waiting…" }
For creators
Models and creators clone their voice and personality, then let an AI keep their audience engaged across DMs, texts, and calls — self-serve, with guidance whenever you want it.
For enterprise
White-glove deployments with a hybrid rollout — run AI alongside your team and A/B test until you're confident, then shift the mix at your pace. Our networks have seen AI outperform human chatters.
Transparent
Open pricing, honest numbers, and no pretending it's human. It's synthetic — that's the point.
Simple
Live in minutes. The docs are the brochure. If something adds friction, it doesn't ship.
Hear it for yourself
Call a synthetic voice and have a real conversation — then build your own on the same engine.