A new AI shouldn’t mean starting over.

A free Windows app that keeps your AI conversations, memories and notes on your PC, so you can switch models and pick up where you left off.

Download for Windows

Free and open source. Use an API key, ChatGPT sign-in or a local model.

Today’s continuity briefing · On your PC

A place to pick up

A small atlas of the night

Your next step

Choose one familiar constellation and plan a first photograph with the camera I already have.

One familiar constellation is enoughSaved memory · revision 1
A small atlas of the night.mdLocal document
Choose the first constellationCalendar · Oct 20
Night skySuggested connection · not yet confirmed

Talking with Gemini. Google receives only the records you allow it to use.

Illustration with fictional records, not a live AI result. Switch the model: your saved records stay put.

Pick up where you stopped.

Where you left off

Save a decision and your next step. When you come back, PCS shows where you stopped and can give the AI the earlier records that matter.

Download for Windows Read the setup guide

Actual PCS screens with fictional data: Conversation and Library 0.9.114; Map 0.9.139. No live AI results.

You decide what it keeps.

Saving, memory and sharing are separate choices. Every memory PCS writes stays open to you: read it, fix it or forget it.

How memory works

Choose what gets saved
Saving the words and creating memories from them are separate settings. Turn on both, one or neither.
Keep one conversation off the record
Tick Don’t save this conversation before you start. Your usual settings stay as they are.
See where a memory came from
Each memory the AI writes links to the saved passage behind it, so you can check the original words.
Correct it in your own words
If a memory is wrong or too broad, fix it. The earlier revision stays readable.
Forget what shouldn’t stay
Forgetting removes a memory from recall. PCS shows what it affects first.
Lock it and back it up
Lock closes access to the vault. An encrypted backup restores your saved data with its passphrase.

Illustrations of PCS controls with fictional records. Recall can miss details, and the AI can still get things wrong; that is why every memory can be read, corrected or forgotten.

Follow a line back to what you said.

The Continuity Map starts with Constellations built from your saved topics and the people, places and projects you mention. Follow a theme into Focus, compare two themes, and use the trail to return. Each line joins themes saved together; open it to read the records behind it.

Try the demo in your browser. It tells a fictional story and never touches your data or an AI model.

Try the Map demo

PCS 0.9.139 Map in full screen: a fictional night-sky project, the connection between Mara and the Pleiades, and the saved records behind it. — Continuity Map in PCS 0.9.139 with fictional records; no live AI result.

Set it up once.

One download
First, extract the complete Windows ZIP into a new folder.
Set up PCS
Then open Start PCS.exe and follow the setup guide to create your vault and choose a model.
Every conversation
Next, talk or type. PCS saves what you allow it to save.
Whenever you return
Later, pick up where you left off, with any supported model.

Read the full setup guide

Voice and screen sharing need a supported model and extra setup.

Know where your data goes.

PCS keeps your records on your PC. A cloud model sees only what you allow it to use, and that content then follows the provider’s own terms.

Read the data and privacy guide

What PCS stores and shares

On your PC, unless a row says otherwise.

In your encrypted vault

Saved conversations: Encrypted
Memories and their revisions: Encrypted
Notebooks: Encrypted

Outside the vault

Original documents in Materials: Not encrypted
Readable exports: Not encrypted

Sent to an AI

Cloud model: content you allow it to use: To the provider
Local model: conversation and memory: Stays on your PC

Backups

Encrypted backup of your PCS data: Your passphrase

Back up original documents separately.
Keep your backup passphrase safe.

Start with Download for Windows

You’ll need a Google API key. API use is billed by Google, separately from any Gemini subscription.

PCS 0.9.154 for Windows x64. Free, with no PCS subscription; provider API charges and any subscription used for ChatGPT sign-in are separate.

New since 0.9.146: OpenRouter in guided setup, with memory, notebooks, Practice, Calendar and optional Vision for a compatible model. Use its own key and choose an exact model. Free-model limits vary; OpenRouter web research can cost extra.

The default Companion direction is calmer, with less routine praise and fewer automatic follow-up questions. Custom directions stay yours. Direct Qwen access and automatic activity following have been retired; manual Activity details, Practice and PCS Perspective remain available.

Release notes Application source Checksums

Linux or Mac? See the earlier experimental builds.

Already using PCS? Make a backup first, then follow the update and restore steps.

Before you install

PCS offers Sign in with ChatGPT for eligible accounts, subject to account access and usage limits. This is separate from the OpenAI API connection. Google, OpenAI, Meta, Claude and OpenRouter API connections use their own keys and billing; a consumer chat subscription does not provide API credit. OpenRouter offers free models as well as paid ones; availability and limits depend on your account and model, and optional web research may charge separately. A compatible local model does not need a cloud AI subscription.

No. Saving conversation text, creating memories and sharing saved information are separate settings. The model receives selected information, not your entire archive. Recall and AI-written memories can be incomplete or wrong; you can inspect and correct them.

Local conversation and memory can work offline after the required downloads. Leave online services off and check the selected providers for other tasks, such as document preparation. You can also browse saved records, read documents, edit notebooks and use the manual Calendar without starting AI.

The current release is for Windows x64. Earlier experimental builds are available for Linux x64 (0.9.115) and macOS on Apple silicon (0.9.114). They do not include every current Windows feature. Read the platform limits.

Use Quit PCS and wait for “PCS closed.” Closing its browser tab can leave the app running. Stop ends the conversation and capture; Lock closes access to the vault.

Quit PCS and back up your data folder, then extract the new version into a fresh folder. Follow the update and restore steps.

A new AI shouldn’t mean starting over.