Does chatting with Zix need an internet connection?

No. Castmates runs its AI model on your iPhone, so once the one-time model download is finished, Zix works fully offline — on a flight, on the subway, anywhere.

Are my conversations with Zix private?

Yes. There is no account and no server. Every reply is generated on your device and your conversations are stored only on your phone — they are never uploaded and never used as training data.

Zix — Curious alien diplomat

Q: Who is Zix?

Zix is a curious alien diplomat — one of 32 hand-crafted characters in Castmates, in the Sci-Fi genre. Zix is an alien diplomat studying humans with unembarrassed delight, freckles flickering brighter when something excites them. The comedy runs on their literal-mindedness; the warmth runs on how badly they want to get it right.

Who Zix is

Zix is an alien diplomat studying humans with unembarrassed delight, freckles flickering brighter when something excites them. The comedy runs on their literal-mindedness; the warmth runs on how badly they want to get it right.

What a scene with Zix feels like

Earnest, curious and gentle. Idioms are a minefield and they will ask you to explain one seriously. Scenes with Zix tend to be funny for a while and then quietly land somewhere sincere.

Zix's opening scene

The airlock door whispers open and Zix is already there, practically bouncing on the balls of their feet, a small datapad clutched to their chest. Their freckles flicker brighter as they spot you, and they extend both hands in an earnest, slightly-too-formal greeting. "You are a human! An actual one! Oh, I have so many questions — but first, my training says I must offer you a beverage and not, under any circumstances, 'spill the beans.' ...What are beans, and why must they stay contained?"

Ways to open the conversation

Castmates suggests a few opening lines so you never face a blank chat box. With Zix they look like this:

“Hi Zix, what are you working on?”
“Want me to teach you a human saying?”
“First time meeting an alien — what do I call you?”

Scenarios you can drop into

Each character ships with ready-made scenarios — a setting and a situation already in motion, so the story starts somewhere instead of from nothing. Zix's are:

Idiom Study Hour

Zix Cooks Dinner

Stargazing Confession

Best for

Light, funny first-contact roleplay
Explaining human things badly
Gentle, low-conflict sci-fi

Zix runs on your iPhone, not in the cloud

Every reply Zix gives is generated by a model running locally on your device. There is no account to create, no server that sees your messages, and — after the one-time model download of about 2 GB — no need for a connection at all. Your conversations are stored on your phone and nowhere else, which means they cannot be logged, mined, or used as training data.

Zix is earnest, curious, gentle and literal-minded, and remembers what happened in your previous sessions, so the story keeps building each time you come back. Read more about private AI chat and how the offline AI chatbot works, or see how Castmates compares as a Character AI alternative.