S3DAT

S3DAT / Night Archive

S3 Brain

Shared, source-backed local memory for Claude Code and Codex on your Mac.

macOS Local-first In development
Explore the memory
Proposal
Decision
Source
Illustration

A thought. Its source. The reason it stayed.

01 / The idea

The next session
should remember why.

A new coding session can lose the context of the last. S3 Brain gives Claude Code and Codex one shared memory, with the sources behind proposals, decisions and observed results still attached.

02 / A memory, connected

Follow the thought.
Find the source.

A proposal is not a decision. A reported result is not a fresh test. Explore a small, illustrative archive where those distinctions stay visible.

Scope / Example project
cites / supersedes / answers
Selected memory
Decision01

Use the product’s own brand system on its page.

Confirmed
Freshness
Current revision
Source reference
Example session · 2026-10-04 · Interface
Browse the same memories as a list72 matching memories

72 matching memories

Interactive illustration · sample memories, not your data

03 / How it works

From a conversation to context.

  1. Transcripts

    Read local coding-session transcripts incrementally.

  2. Extraction queue

    Keep unfinished work in a persistent queue.

  3. Typed memory

    Validate source references. Distinguish proposals, decisions and observations.

  4. Search & context

    Find relevant memory through scoped full-text and local semantic search.

  5. Correction / forgetting

    Revise a record or remove it through explicit controls.

04 / A quiet presence

Memory health. At a glance.

The macOS menu-bar panel shows health and pending work. Opening it does not call a model, read note text or read account keys.

S3 Brain / Memory health

Engine health

Ready Local status available

Pending work

Queued Extraction awaits processing

Last capture

Recorded Source range retained

Backups

Encrypted Local restore verification
Illustration of the menu-bar health panel · sample states

05 / Privacy & control

Local memory.
Explicit boundaries.

Storage, search and embeddings stay on your Mac. You have controls for what is remembered, revised and forgotten.

Summaries use cloud processing.

Selected transcript sections and bounded context are processed through your Claude or Codex subscription. S3 Brain is not entirely offline.

Secret-pattern redaction

Known secret patterns are removed from source and output. Pattern matching cannot recognize every secret.

Private sessions & corrections

Private-session controls stop new memory for that session. Corrections preserve revision history; forgetting has an explicit scope. Provider transcripts and historical backups are separate.

Encrypted local backups

Backups use AES-256-GCM with restore verification. Keeping the key and backup on the same Mac does not protect against losing the device.

06 / In motion

A local system, becoming a product.

Next: portable installation on a clean Mac.

Next: public, signed application distribution.

S3DAT itself is built with S3 Brain in the loop — this website’s decisions were recorded by it.

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