Talk and chat with AI,
without boundaries.
One API for adult AI across chat, voice, calls, text, and email — under your brand. The engine behind 100+ adult brands, performing like your best chatter and never clocking out.
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.
Your best chatter — cloned, on every channel, 24/7
Human chatters are expensive, inconsistent, and asleep half the day. sinth runs your personas across chat, voice, text, and DMs with shared memory and guardrails — on-brand every time. Operators on our networks have watched AI out-convert their human teams.
Who builds on sinth
The API is the product
Sign up, grab a key, and ship. No sales call required — 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…" }
Try it yourself
Chat with a synthetic companion or call one — then build your own on the same engine.