The Compounding Second Brain
Your ideas
don't die.
They connect.
They compound.

Memex watches everything you read, listen to, and watch — and quietly builds a living map of your mind that grows smarter with every piece of content. Not a highlights dump. A thinking partner that remembers what you've forgotten and finds the threads you never knew existed.

10K+
Hours consumed / year
by the avg. knowledge worker
< 5%
That actually shapes
how they think
0
Tools that compound
it over time
01 · The Problem

You consume constantly.
Almost none of it sticks.

The problem isn't that you read too much. It's that every piece of content you consume dies in isolation.

Readwise saves your highlights in a flat list. Notion is a graveyard of half-finished notes. Pocket has 400 unread articles.

Nothing you currently use watches across time. Nothing connects a podcast from January to an article from March to a note you wrote six months ago.

A typical week's intake — fate unknown
🎧
Lex Fridman · Sam Altman Episode
3h 12min · listened 80%
forgotten
Memex: All five connect to one thread
Non-linear returns on deliberate learning
surfaced
02 · How It Works

Four layers. One living
knowledge engine.

01

Ingest Everything

Browser extension captures articles as you read. Podcast RSS feeds sync automatically.

02

Semantic Memory Across Time

Every new piece is compared against your entire history — not just last week.

03

The Connection Engine

Memex detects when new content reinforces or extends something you've encountered before.

04

The Sunday Letter

Every Sunday, a personal letter: which beliefs are crystallizing and being challenged.

Thread · "Compounding & Learning"
Jan
12
Article · Farnam Street
"The biggest returns come from reading the same great books multiple times."
Feb
28
Podcast · Huberman Lab
"Spaced repetition rewires synaptic architecture."
03 · The Sunday Letter

Your week in thought,
written back to you.

Every Sunday, Memex sends you a personal letter — a mirror of your intellectual week.

Sunday, March 9th · Your weekly reflection
Good morning.
This week you consumed 14 pieces of content. Memex surfaced one thread crystallizing over 4 months.
04 · Features

Everything a second brain
should actually do.

01

Thread Detection

Recurring themes across sources and months.

02

The Sunday Letter

Personal reflection every week.

03

Ask Your Archive

Synthesize your evolving stance by topic.

05 · Pricing

Built for thinkers.
Priced for individuals.

Curious
Free
  • 30 pieces / month
  • 3 active threads
Scholar
$45
  • Everything in Thinker
  • API access
Early Access Open

Start compounding
your thinking.

Join the waitlist. The first Sunday Letter that feels like a mirror.