Local-first. Private by design.

Your quiet corner for warm clarity.

Meet Phos, a private AI companion for thinking, writing, studying, and deciding. Start locally on your Android phone, bring your own key when you choose, or connect to your own local server.

Get Phos Free

No account needed. Runs offline in seconds.

Phos app home screen showing quick starts and mascot
Tap to see a local pass
Phos mascot
No company cloud for private dataNo account requiredNo ads or purchases in V1Public on GitHub

Yourunfinishedthoughtsdeserveaquietplace.Phosstartswithlocal-firstprivacy,noaccount,noads,andmemoryyouchooseyourself.Uselocalmodelswhenyouwantfullcontrol.Bringyourownkeyorlocalserveronlywhentheextrareachisworthit.Theboundaryshouldalwaysbevisible.

The Companion Manifesto
Phos interactive app playground

See the real boundaries

Toggle the same product concepts Phos uses in the app: local model, BYOK, local server, app lock, local tools, memory, and generation settings.

Active setup preview
Running locally with a downloaded model

Chats, memories, and selected local model metadata stay on this device. No company-hosted inference is involved.

Local mode

Built around how you actually think.

Not another chatbot wrapper. Phos is a private thinking space designed around real workflows.

Private by default

Conversations that stay yours.

Ask about private notes, startup ideas, study questions, or a difficult message. In local mode, your thread stays on the device. In BYOK or local-server mode, Phos shows the boundary before anything leaves.

Private chat screenshot
Your Companion

Always alive. Always yours.

Meet Companion, a quiet presence that reflects real app states: listening, thinking, responding, recalling, locked, or offline.
Mascot status
Guided workflows

Start thinking in one tap.

Quick Starts give you structured templates for what you actually need, without prompt engineering.
Think through
Draft message
Study guides
Plan day
BYOK + Local

Your models. Your rules.

Run supported GGUF or LiteRT-LM models on Android, connect Ollama or LM Studio on your network, or bring your own provider key. Phos is the private interface, not a hosted inference middleman.
QwenGemmaGGUFLiteRT-LMOpenRouterGeminiOllamaLM Studio
Security first

Locked down. Fully yours.

Phos keeps private data local by default, stores provider keys in secure storage, and gives you app lock plus optional privacy cover controls. Full database encryption remains a future hardening step.

App Lock

Biometric or passphrase gate

Optional

Secure Keys

Provider keys stay in secure storage

Local

Quiet Reports

Diagnostics are user-triggered

No ads

Set up in 30 seconds.

No login. No signup form. No credit card. Just open the app and start thinking. It's that simple.

Phos onboarding screen, no login required
Phos celebrating

Start thinking clearly.

A private, local AI companion for the thoughts you don't want on someone else's server.

Free, public source, no login, no ads, and no purchases in V1.