Now on the App Store — Free

Your library,
finally alive.

Snap physical book pages. Import Kindle highlights. Synapse finds hidden connections across everything you've ever read — then lets you chat with your entire library.

Download on the App Store

Coming soon to Android

Free to download

Your data stays yours

iOS · Android coming soon

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The Problem

Your highlights are collecting dust.

You read great books, underline brilliant ideas — then they disappear. Synapse is the first app that actively connects everything you've ever read.

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Physical books go un-digitized

You write in the margins, but those insights never leave the page.

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Kindle highlights stay siloed

Amazon doesn't connect your notes across books or years.

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Ideas stay fragmented

The best thinking happens when ideas collide — but that never happens on its own.

Flash Insight

💡 Connects to Atomic Habits — "You fall to the level of your systems." Saved 47 days ago.

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Your hero screen recording
assets/latest.mp4

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Deep Work — Cal Newport

✓ Highlight saved

3 connections found in your library

Features

One home for all your highlights.

Not a storage bucket — an active thinking engine that grows smarter every time you read.

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Scan Any Physical Book

Snap any page. Tap to select the passage. The AI Janitor strips headers, page numbers, and OCR noise — leaving only the clean idea, instantly searchable.

"No more retyping. Snap and it's saved."

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Flash Insights

Every save triggers a real-time search of your entire library. When your new note echoes or contradicts an old one, you get a Flash Insight — bridging ideas across books and years.

"💡 This echoes your note from Deep Work — 3 months ago."

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Import Kindle Highlights

Drop in your My Clippings.txt and years of Kindle notes are organized instantly. Your whole reading life, searchable in seconds.

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Chat With Your Library

Ask your entire reading history anything. Compare authors, find a half-remembered quote, or ask big questions. Every answer is drawn from your own highlights — not the internet.

"Like talking to the best version of your past self."

How It Works

From page to insight in seconds.

Three steps to transform how you capture and connect everything you read.

Capture the Page

Snap any book page. Tap to select your passage. The AI Janitor removes headers, page numbers, and formatting noise automatically. No retyping — just the idea, clean and searchable.

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Scanning a book page
step1-scan.mp4

Get a Flash Insight

The moment you save, Synapse searches your entire library in real-time. When it finds a connection — an echo, a contradiction, a complement — you get a Flash Insight. The more you capture, the smarter it gets.

Flash Insight

💡 Connects to Atomic Habits — "You don't rise to your goals, you fall to your systems." Saved 47 days ago.

Talk to Your Books

Use the Chat tab to ask your library anything. Compare authors, find that quote you half-remember, or ask big questions. Every answer is grounded in your own highlights — cited, not made up.

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Chatting with your library
step3-chat.mp4

Full Walkthrough

See the whole flow in 60 seconds.

From first scan to Flash Insight — watch how it all comes together.

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Full demo
latest.mp4

Your library,finally alive.