Castmates
AI characters that run fully on your iPhone
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Castmates is an app for interactive stories with AI characters, and the AI runs entirely on your iPhone. No account, no cloud, it works in airplane mode. 35 characters across 8 genres and 127 ready-made scenes, or build your own. They narrate, stay in character and remember earlier sessions. You can call them too, and they can call you, with speech in and out on the phone. A one-time 1.8 GB download, then nothing you type or say leaves the phone.
PH · launched Nov 10, 2026 · 1 upvote (top 65%) · 0 views
Niche: ai interactive fiction and rpg platforms · 63 launches, 5 in the last 7 days ▼ -55% · Explore this niche →
Category and tags
- Media & entertainment
- Agent / copilot
- B2C
- AI-native
- Commercial product
- iOS
- Artificial Intelligence
Visit website ↗ Source listing ↗
More like this: all 63 launches in ai interactive fiction and rpg platforms →
Could you build this?
Partial The iOS app shell, character and scene content browsing, and session memory are vibe-codeable. Running a capable LLM fully on-device with good character quality and acceptable performance is a hard engineering problem that vibe coding alone won't solve.
What it would actually take: Build a native SwiftUI app that loads a quantized small language model via Core ML or MLX/llama.cpp bindings, with local storage for memory and scenes. The hard part is model selection, quantization, and performance tuning to run smoothly on iPhone within memory and battery limits, plus writing high-quality character and scene content. This requires ML inference optimization experience and substantial creative writing effort.
Competitors
Other products that read as similar to this one : 347 launches clear the similarity bar, closest 8 shown.
Attention rank: #164 of 348 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 289 days after the earliest competitor.
- CastWorkshop · ph · 2026-10-17 · 1 upvotes · similarity 0.54
- Foundry · ph · 2026-10-26 · 3 upvotes · similarity 0.47
- Characters AI Chat · ph · 2026-11-08 · 1 upvotes · similarity 0.46
- Amavie · ph · 2026-10-20 · 2 upvotes · similarity 0.45
- Amavi · ph · 2026-10-06 · 1 upvotes · similarity 0.45
- Zapters · ph · 2026-09-16 · 1 upvotes · similarity 0.45
- iphone-use · ph · 2026-10-06 · 93 upvotes · similarity 0.45
- I Am Mate · ph · 2026-10-18 · 1 upvotes · similarity 0.45
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.