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Zihin
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Your second mind

Everything you save,
brought back the moment it matters.

Zihin captures what you bookmark on X and LinkedIn, understands it, and resurfaces it before you forget — with answers cited from your own library, never invented.

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zihin.engineer
Welcome to Zihin
Your second mind for everything you save
GContinue with Google
Free forever · No credit card
Signed in
fresh
React 19 compiler notes
@dan_abramov
forgotten
fresh
Designing resilient RAG pipelines
@jerryjliu0 · saved 38d ago
Resurfaced for you
aging
A field guide to evals
@swyx
cold
Type-safe SQL in 2026
@john-db
fresh
The case for boring tech
@mcclure111
aging
Notes on attention
@karpathy
Ask Zihin
What did I save about Postgres indexing?
You saved 3 threads on Postgres indexing:
Partial indexes cut scan time on filtered reads 1
Covering indexes avoid heap fetches entirely 2
1@swyx 2@john-db
Your knowledge snapshot
Saved
284
Read
41
Read ratio
14%
Topics over time
Zihin · Second Mind
★★★★★ 4.9 · Productivity
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Zihin
Sources
X / Twitter
Chrome
inLinkedIn
All bookmarks0
Importing…
fresh
React 19 compiler notes
aging
A field guide to evals
fresh
Resilient RAG pipelines
cold
Type-safe SQL in 2026
fresh
The case for boring tech
aging
Notes on attention

Save it once, anywhere.

Saved ≠ remembered

A bookmark is where a good idea goes quietly cold.

You save hundreds of things a year and open almost none of them again. They don't vanish — they fade. Zihin measures the fade, and brings the right things back.

Fresh
Aging
Cold
Forgotten

One library

Connect once. Everything in sync.

One click and Zihin pulls every bookmark from X, Chrome and LinkedIn into a single, searchable second mind — automatically, through your own logged-in session. Never your password.

X / Twitter
Auto-sync
Chrome
Auto-sync
in
LinkedIn
Auto-sync
More platforms coming soon
Reddit Bluesky Substack Instagram Threads
Ask Zihin
Who do I save the most about lately?

Mostly RAG systems and Postgres — 14 saves this month 1 2

1@jerryjliu02@swyx

Ask

Chat with your whole library.

Ask in plain language. Zihin answers from what you actually saved — every claim cited back to the source, nothing invented.

Resurface

Nothing slips away.

A decay radar scores every save as it cools — fresh, aging, cold, forgotten — and brings the important ones back before they leave your mind for good.

Forgotten · 38d
Designing resilient RAG pipelines
@jerryjliu0
Resurfaced for you today
Saved
284
Read ratio
14%
Most bookmarked
@john-db
@swyx
@karpathy

Reflect

See what your mind collects.

A living snapshot of your topics over time, how much you actually read, and the people you keep learning from.

Connect

Watch the ideas link up.

Zihin maps the threads running between your saves, so related thinking finds itself — and a half-formed idea meets the note that completes it.

Knowledge map

Pricing

Start free. Upgrade when it grows.

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Free

$0/forever

  • 500 bookmarks
  • Auto-capture + search
  • 30 AI credits / month
  • Export anytime
Start free

Pro

$10/month

  • 50,000 bookmarks
  • Chat with your library
  • Snapshot + decay radar
  • 3,000 AI credits / month
Go Pro

Expert

$39/month

  • Everything in Pro
  • 150,000 bookmarks
  • 10,000 AI credits / month
  • 3× daily AI limits
Go Expert

Your second mind

Your library is already a second mind.

Start reading the signal.

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Free forever · No credit card · Export anytime