Everyone who wants a second brain wants the same thing: read widely, keep what matters, and have it surface again exactly when it’s needed. Almost nobody wants what most second-brain setups actually demand — a weekend designing folder hierarchies, then a weekly maintenance ritual that quietly becomes the hobby itself.
Marqly’s position is that the maintenance was never the point. Capture should be one click, organization should be automatic, and retrieval should work from a half-remembered description. That’s the whole system. If you’re still weighing what category of tool you even need, what is a second brain app covers the landscape; this page covers how Marqly runs the loop.
Capture from wherever you already are
A second brain lives or dies on capture friction. If saving something takes more than a moment, you skip it when busy — and busy is when the good stuff shows up.
Marqly’s capture is built into the places you already read: a one-click save from the browser toolbar (Chrome, Edge, Firefox, and Safari), an iOS app for saves on your phone, and a tab saver that sweeps every open tab into your library at once when a browsing session ends. Highlights count as capture too — select text on any page, mark it in one of six colors, add a note, and the passage syncs to your library while staying visible on the page when you return. Save a YouTube video and its transcript is attached, so even video knowledge becomes searchable text.
If you’re migrating an existing pile, imports handle Pocket exports, Raindrop.io collections, and standard browser bookmark HTML files — your history comes with you.
The organizing step is no longer your job
This is where hand-built systems fail, and where Marqly diverges. In Notion or Obsidian, you are the librarian: every capture needs to be filed, linked, or templated, and the vault’s usefulness tracks your discipline. Skip three weeks and you return to an inbox of unfiled captures that silently kills the habit. The heavyweight tools are genuinely more powerful for original writing — but the upkeep is the price, and most people stop paying it.
In Marqly, AI tags every save automatically the moment it lands. No inbox, no filing queue, no decay function on your discipline. AI summaries do the second half of the librarian’s job: each saved article gets a summary, so triaging a backlog means scanning summaries, not re-reading pages. For how the tag-based approach compares to folder systems generally, see how to organize bookmarks.
Retrieval that works like memory does
The test of a second brain is a question like: “there was an article about why switching costs beat network effects — where is it?” A folder system answers only if you filed it under the right name. Keyword search answers only if you remember the title’s exact words.
Marqly’s semantic search answers from meaning. Describe the thing — even loosely — and it finds the save, searching across titles, content, your highlights, and video transcripts. This is the feature the whole system leans on, and it’s explained properly in how to search bookmarks with AI. On Pro, retrieval goes a step further: chat with your saves, asking questions in plain language and getting answers drawn from your own saved content — your library starts acting like a research assistant with a very specific reading list.
Getting started
Sign up free at app.marqly.com — no card — and install the extension. Then skip the part where you design a system, because there isn’t one to design. Save the next ten things worth keeping, highlight the passages that made them worth it, and let the tags accumulate on their own.
The habit is the entire setup. If you want a fuller method for building the practice — what to capture, what to skip, how retrieval habits form — work through how to build a second brain.
Who this is not for
If your second brain is primarily a writing system — long original notes, backlinks, graph views, daily journals — Obsidian or Notion is the right tool, and Marqly won’t replace it. Marqly holds what you save from the web, not essays you compose from scratch. Plenty of people run both: Marqly as the capture-and-retrieval layer for web content, a notes app for their own thinking. The honest comparison across the category, including where the heavyweight tools win, is in the best second brain apps of 2026.
Also worth knowing: there’s no Android app (the web app works in Android browsers), no offline mode, and no team features — this is a single-player tool.
The fit: most of what you want to remember starts as something you read or watched online, and the system you’ll actually stick with is the one that demands nothing after the save. That’s the exact shape of Marqly.
Frequently asked questions
What makes Marqly a second brain app?
It covers the full loop a second brain needs: capture (one-click save, highlights, tab saver), organization (AI tags every save automatically), and retrieval (semantic search finds saves by meaning, and Pro adds chat with your saved content). The difference from most tools is that the middle step requires no work from you.
How is this different from building a second brain in Notion or Obsidian?
Notion and Obsidian are powerful, but their systems are hand-built: you design the structure and you maintain it, and the system decays the week you stop. Marqly automates the maintenance — tagging and filing happen on save. You trade deep customization for a system that never needs gardening.
Do I need to set up a structure before I start?
No. There is no required folder tree, tag taxonomy, or template to design. You install the extension, save the first thing worth keeping, and AI tags it automatically. Structure emerges from the tags as your library grows, and boards are there when you want to group things by project.