Lochan

Lochan is a private AI chat app that runs entirely on your device - no account, no cloud, no one else in the loop.

PRIVATE BY DEFAULT
Lochan runs AI models directly on your iPhone and iPad. Use Apple's built-in on-device model, or download open models like Qwen, Gemma, and Llama and chat with them fully offline. Your messages never leave your device unless you choose to share.

TRULY OFFLINE
No sign-in. No servers. No data sent anywhere. Once a model is on your device, Lochan works on the plane, in a tunnel, or with everything switched off. Your conversations stay yours, always.

SHARE WITHOUT GIVING IT AWAY
Want to send someone a conversation? Lochan encrypts it on your device before it ever leaves - we can't read it, and neither can anyone but the person you hand the link to. You preview exactly what's included, links expire automatically, and nothing is ever shared unless you choose to.

ONE APP, EVERY MODEL
Pick the right model per conversation:
- Apple's built-in on-device model - instant and offline
- Downloadable open models (Qwen, Gemma, Llama) - offline, on your terms
- Switch models whenever you like, right from the chat

THE RIVER VIEW
Conversations in Lochan are living things. Regenerate or edit any message to fork a new branch instead of overwriting the old one. Then pinch out to see the whole conversation as a flowing river - trunk, tributaries, and every path you explored - and tap to jump anywhere.

SEE, HEAR, AND MORE
- Attach images, PDFs, and text files - Lochan understands them
- Read replies aloud with natural voices (choose the voice and speed)
- Generate images from a prompt

BUILT TO FEEL GOOD
- Answers stream in smoothly, like a person typing
- Markdown and code blocks rendered cleanly
- See the model's reasoning when you want it
- A calm Alpine-forest theme in light and dark

Lochan is for people who want a capable AI assistant without handing their conversations to a stranger. Private by default. Powerful on its own. Always on your terms.