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Castmates: Offline AI Roleplay
Private AI roleplay that runs fully on your iPhone
Chat and roleplay with a cast of 32 hand-crafted AI characters — running entirely on your iPhone. No accounts, on-device, works offline. Your conversations never leave your phone.
Hey Product Hunt 👋
I'm the maker of Castmates. It's an AI roleplay app where the entire model runs on your iPhone instead of in the cloud.
I built it because every AI companion app I tried wanted an account, sent everything I typed to a server, and stopped working the moment I lost signal. That felt backwards for something as personal as roleplay. So Castmates flips it. The AI generates and stores everything on your device. No account, no login, no data leaving your phone, and it keeps working in airplane mode.
What you get:
32 hand crafted characters across 8 genres, from fantasy and sci-fi to romance, mystery and anime
96 ready made scenarios to jump straight into a story
A creator to build your own characters with custom persona, voice, appearance and opening scene
Persistent memory, so characters remember who you are and pick the thread back up days later
Fully offline and private by design
The hardest part was getting genuinely good roleplay out of a model small enough to live on a phone. Characters that stay in role, narrate scenes, and don't forget who you are halfway through. That took a lot of evaluation work and it's the part I'm most proud of.
It's free to start with the full cast. There's a Pro plan for unlimited messages and custom characters.
This is a v1 and I'm here all day. I'd love to hear what you think, especially who you want to roleplay with next. Ask me anything about the on-device model, the memory system, or the privacy design.
Link: https://get-castmates.com
Love that everything runs locally and the chats never leave the phone, feels like the right call for something this personal. 32 hand-crafted characters is a lot of care poured in.
About Castmates: Offline AI Roleplay on Product Hunt
“Private AI roleplay that runs fully on your iPhone”
Castmates: Offline AI Roleplay was submitted on Product Hunt and earned 5 upvotes and 3 comments, placing #95 on the daily leaderboard. Chat and roleplay with a cast of 32 hand-crafted AI characters — running entirely on your iPhone. No accounts, on-device, works offline. Your conversations never leave your phone.
Castmates: Offline AI Roleplay was featured in iOS (110.5k followers), Artificial Intelligence (473.1k followers) and Entertainment (1.9k followers) on Product Hunt. Together, these topics include over 145.8k products, making this a competitive space to launch in.
Who hunted Castmates: Offline AI Roleplay?
Castmates: Offline AI Roleplay was hunted by Josip Markovic. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Josip Markovic