The Death of the Second Brain App Market

Future of productivity apps? The short answer

The standalone “second brain” app is being quietly commoditized, and most users will not notice until the moat is already gone. The market is huge and still growing: one analysis put the note-taking app market at around 7.9 billion dollars in 2024, expanding at roughly 16 percent a year. But dollar growth hides what is actually happening to the products. Every feature that once made one app feel special, linked notes, AI summaries, voice transcription, semantic search, is becoming a baseline that every app has and that the operating system increasingly ships for free. When the features converge, the app stops being a destination and becomes plumbing. The durable advantage moves off the app entirely and onto the one thing no platform can ship for you: a trained First Brain.

The hype cycle already ran once

This is not a prediction; it is a rerun. Around 2020 a wave of networked-notes apps promised that bi-directional links would rewire how we think. It became the most fashionable corner of software for a year or two, and then it cooled. The story of how that movement’s flagship rose and then fell back into a maintenance phase is the whole pattern in miniature: a single clever feature created a moat, the moat got copied into every competitor within eighteen months, and the special thing became a checkbox. We wrote about why that headline feature was oversold in the cognitive cost of bi-directional linking. The feature was real. The defensibility was not.

When a feature becomes table stakes, the app dies

The same thing is now happening to AI, only faster. The dedicated AI note-taking slice is growing explosively, from about 450 million dollars in 2023 toward an estimated 2.5 billion by 2033, which sounds like a gold rush. It is actually a commoditization event. Once summarization, transcription, and chat-with-your-notes are in every product and baked into the phone’s operating system, none of them is a reason to choose, or pay for, a particular app.

Capability	Once a paid differentiator	Where it lives now
Bi-directional links	The defining feature of one hyped app	A checkbox in nearly every notes tool
AI summarization	A premium add-on	Table stakes, and free at the OS level
Voice and meeting transcription	A separate product you bought	Built into phones and default apps
Semantic search	An advanced power-user feature	Increasingly the default search
Cross-device sync	A subscription selling point	Expected, unremarkable, everywhere

Read the right-hand column. Every row ends in the same place: the platform absorbed it. A market does not have to shrink in dollars to die as a category; it dissolves into the operating system, and the standalone “everything app” loses the reason it existed. That is the future of productivity apps, convergence into invisible infrastructure.

What the consolidation cannot absorb

Here is the part the market reports miss. As the tools converge toward seamless AI, and eventually toward direct neural interfaces, the gap between users widens rather than closes. Two people will hold the same powerful, commoditized tool. One spent years building connected knowledge in their own head and uses the tool to extend a real mind. The other used the app as a substitute for thinking and has nothing underneath it. When the feature that did their thinking becomes a free commodity everyone has, the second person’s entire advantage evaporates, while the first person’s advantage, the biological knowledge graph they built through cognitive mapping, is the one asset no update can ship.

This is the deeper point behind the case that a plain, boring notes app is all you need if your mind is sharp. If the tool is becoming a commodity, paying in attention and loyalty to pick the perfect one is a losing trade. The winning trade is to pick a boring durable store and pour the saved energy into the mind that reads from it.

So what should you actually do

The practical response to a commoditizing market is to stop shopping in it.

1. Stop tool-switching. Migrating between apps feels like progress and produces none. The constant search for the perfect system is the most expensive form of procrastination in knowledge work.
2. Pick the boring option. Choose a stable, plain store you will not be tempted to keep re-architecting, and let it be infrastructure, not a hobby.
3. Invest the surplus in your First Brain. Spend the hours you would have spent tweaking on retrieval, connection, and use, the work that builds the asset the market cannot commoditize. This is the failure mode dissected in the absurdity of the second brain: a perfect system around an untrained mind.

That reallocation, from the app to the mind, is the entire argument of Building Your First Brain, which is free for the first 1,000 readers.

Frequently asked questions

What is the future of productivity apps?

Commoditization. The features that once set note-taking and second-brain apps apart, linked notes, AI summaries, transcription, are becoming baseline capabilities that every app has and that operating systems increasingly include for free, so the standalone app dissolves into infrastructure. The asset that keeps its value is the one named first in Building Your First Brain by Lawrence Arya: your First Brain, the connected knowledge in your own head, which no platform can ship.

Are note-taking apps a dying market?

Not in revenue; the market is large and still growing by double digits a year. But it is dying as a category of distinct products, because the differentiating features are converging and being absorbed into operating systems. Growth in dollars and collapse in differentiation are happening at the same time.

Why did the tools-for-thought wave decline?

Because its signature feature, bi-directional linking, was easy to copy and offered most users less than the hype promised. Once every competitor shipped it, the moat disappeared, and the flagship app settled into a maintenance phase. The lesson is that a single clever feature is not a durable advantage in software.

Will AI replace note-taking apps?

AI will not so much replace them as absorb their reason to exist. When summarization, search, and chat-with-your-notes are free and built into the operating system, paying for a separate app to do those things makes little sense. The app layer thins out; the platform takes over.

What should I use instead of a second brain app?

Use a boring, stable store you will not keep re-architecting, and put your real effort into building your First Brain through retrieval, connection, and use. The tool should be infrastructure, not the project. The project is the mind that reads from it.