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Private AI, explained
Straight answers about AI chat privacy and memory on iPhone, with sources. We make Sema: Private AI Memory, and these guides tell you when another app is the better pick.
What is the most private AI chat app for iPhone?
On-device apps that collect nothing, encrypted cloud chats, and what each one still sends.
GUIDEIs there an AI assistant that keeps its memory on my phone?
Where ChatGPT, Lumo and on-device apps keep what they remember about you.
GUIDEWhich AI chat apps work without an account?
Duck.ai, ChatGPT logged out, Lumo guest access, and on-device apps, with the limits of each.
GUIDESema vs ChatGPT, Lumo, Duck.ai and local LLM apps
A side-by-side table with ChatGPT, Lumo, Duck.ai, Ollama, PocketPal AI and Private LLM, and what they do better.
About Sema. Sema: Private AI Memory is an AI chat app for iPhone (iOS 17.0 or later) that remembers useful facts and keeps chats and memories on the device. Free; optional Sema Pro ($4.99/month or $24.99/year) adds more public web search. No account. Sema's page · App Store
Sema: Private AI Memory
An AI that remembers, on your iPhone.
Free. No account. Memories stay on your phone, and you can see or delete each one.
Download Sema on the App Store