Companions with memory and character
The difference between a chatbot and a companion is continuity. Castmates characters are built for it:
- They remember you. Past sessions are summarized on-device, so your companion recalls who you are, what you've shared, and where the story left off — even weeks later.
- They have a self. Each of the 32 characters ships with a backstory, a distinct voice, original portrait art, and opening scenarios — from a soft-spoken confidant to a sardonic ship AI.
- They inhabit scenes. Replies come with action and narration, not customer-service prose. Conversations feel like shared stories, not Q&A.
Or build the companion you actually want
When the cast isn't enough, create your own from scratch: name, tagline, persona, greeting, appearance, and tone. Choose the relationship — Friendship, Romance, Mentorship, Rivalry, or Adventure — add your own tags, set the avatar from your photo library, and write the exact opening scene. They'll be who you wrote them to be.
Privacy isn't optional for a companion
Companion conversations are among the most personal data that exists. Most companion apps process them in the cloud, attached to your account. Castmates can't — the model runs on your iPhone, so every word is generated and stored locally. No account, no uploads, no training on your chats, and it works in airplane mode. Your companion lives in your pocket, not in a data center.
Meet the cast free
Start with 10 messages a day, the full SFW cast of 32, and one custom companion — no sign-up. Pro unlocks unlimited messages and unlimited custom characters from $9.99/month, with the best value at $39.99/year or $59.99 once for lifetime access.