TheBrain

TheBrain connects notes, files, links, projects, and AI in a visual network of linked thoughts. Backlinks and graph views help represent connections, while TheBrain 15 also offers Card View, Mind Map, and Tree View. Cerebro AI can create content, search and summarize a brain, suggest links, and converse using its knowledge. The app is available on Windows, macOS, Linux, iOS, Android, and the web. Windows, Mac, and Linux users can keep data local without cloud sync. The Free App costs nothing and permits unlimited thoughts, links, and brains, with private sync for up to 1,000 thoughts, 100 MB of synced attachments, and limited daily AI. Pro Service costs $15 a month, billed $180 / year, and adds unlimited private sync, Cerebro AI, 30 GB online storage, and one-on-one support. A local API lets scripts and external tools create and link thoughts, run commands, and query brain data. External files and folders linked from a brain but stored elsewhere are not synchronized.

TheBrain combines a visual organization model with multiple views, AI, and a local API. Consider sync limits and the handling of externally stored files when deciding how to keep a brain’s data available.

TheBrain suits people who want to organize connected information visually across notes, files, links, and projects. Its local API may also suit users working with scripts or external tools.

Overview

TheBrain is a visual knowledge-management app for connecting notes, files, links, projects, and AI in a knowledge network. It suits people who want to organize information by its relationships, and teams that need shared editing. Its range of views and local-first desktop use are compelling; users who depend on cloud sync should pay close attention to storage caps and what happens when a paid plan lapses.

Founded in 1996 and based in Los Angeles, TheBrain takes a graph-based approach, with backlinks, offline access, and import and export support. It is a better fit for connected collections than for users who prefer information to live in a simple list or folder structure. The desktop apps for Windows, Mac, and Linux can keep brains local without cloud sync, a useful option for users who want to control where their working data resides.

Key features

TheBrain 15 offers Card View, Mind Map, and Tree View. These let users inspect connected material in different ways, which makes the graph model less restrictive when a map is not the best view for a particular task. Backlinks help surface relationships, while offline access and import and export support make the app usable beyond a cloud-only workflow.

Cerebro AI can create content, search and summarize a brain, suggest links, and converse using its knowledge. That makes it more relevant to people who want AI to work with an organized knowledge base than to those seeking only a standalone writing assistant. Free users get a limited daily AI allowance; Pro Service includes Cerebro AI, and Max Service gives four times the AI usage of TeamBrain. TheBrain says it does not sell personal information or use private synced content for advertising, but Cerebro inputs may be processed by contracted AI providers.

TheBrain 15 also provides a local API for scripts and external tools to create and link thoughts, run commands, and query brain data. That is a practical advantage for technically inclined users who want to connect a brain to their own tools. Security safeguards described by TheBrain include encryption in transit and protections for data at rest. Its privacy policy also describes administrative and physical safeguards.

One important sync distinction is easy to miss: external files and folders linked from a brain but stored elsewhere do not synchronize. A brain may therefore sync while those linked files remain unavailable on another device. Paid cloud storage is also not an indefinite archive after cancellation: once a paid plan has lapsed for six months or more, cloud data exceeding free limits may eventually be removed to reclaim storage.

Pricing

TheBrain uses a freemium model. Its Free App costs nothing, billed $0 forever. It includes unlimited thoughts, links, and brains, all features, private sync for up to 1,000 thoughts, 100 MB of synced attachment storage, and limited daily AI. This is a sensible way to try the full feature set or keep a local brain, but the sync and attachment caps will constrain cloud-dependent collections.

Pro Service costs $15 a month, billed $180 / year. It adds unlimited private sync, Cerebro AI, 30 GB of online storage, one-on-one support, and encrypted backup. It is the clearest upgrade for an individual whose brain exceeds the free sync allowance or who wants AI and a larger online file allotment.

TeamBrain costs $25 a month, billed $299 per person / year. It includes Pro Service features, multi-user editing and sync, unlimited shared brains, 100 GB of storage, per-user reporting and auditing, and priority support. The per-person annual charge makes it a team purchase rather than a simple individual upgrade; the shared editing and auditing are the reasons to choose it.

Max Service costs $40 a month, billed $479 / year. It includes everything in TeamBrain, four times the Cerebro AI usage, 250 GB of online storage, priority support, unlimited sync devices, and early feature access. It fits users or teams that need the higher AI and storage allowances or unlimited device sync; those who do not need those extras can avoid its higher annual charge.

Enterprise uses on-premises server deployment and has custom pricing. This is the option for organizations seeking that deployment model rather than a published per-user subscription. If a paid plan lapses, cloud data beyond free limits may eventually be removed after six months or more, so users should not treat a subscription as permanent storage.

Platforms

TheBrain supports Windows, macOS, Linux, iOS, Android, and web, as well as an API. Desktop users on Windows, Mac, and Linux can keep data local without cloud sync. That flexibility is useful across devices, but external files and folders linked from a brain are not synchronized, so syncing the brain alone does not guarantee access to every referenced file.

Who it's for

TheBrain is a strong fit for people who accumulate interconnected research, project material, and notes and want to navigate those relationships rather than maintain a rigid folder hierarchy. Its multiple views can help users switch between a network and more structured representations. Developers and power users also have a reason to consider it: the local API can create and link thoughts, run commands, and query brain data.

Teams that need shared editing, shared brains, per-user reporting, or auditing should look at TeamBrain or Max Service. TheBrain says more than half of Fortune 100 organizations use its software, though that claim alone does not establish that its collaboration model will suit every team. It is less suitable for someone who needs every linked external file to travel automatically with cloud sync or who wants a generous free cloud allowance.

Pros and cons

• Pros: Connected notes, files, links, and projects can be examined through Card View, Mind Map, or Tree View, giving graph-oriented users more than one way to work with the same brain.
• Pros: Local desktop use, offline access, and a local API make TheBrain useful for people who want to keep data on their own machine or build integrations.
• Pros: TeamBrain and Max Service add multi-user editing, shared brains, reporting, and auditing for collaborative use.
• Cons: Free private sync stops at 1,000 thoughts and 100 MB of synced attachments, so a sizable cloud-synced collection calls for a paid plan.
• Cons: Linked external files and folders do not synchronize, which can leave collaborators or other devices without the referenced material.
• Cons: Cloud data beyond free limits may eventually be removed after a paid plan has lapsed for six months or more, so users need a plan for retaining it.
• Cons: Cerebro inputs may be processed by contracted AI providers, a consideration for users handling sensitive material.

Alternatives

Choose Obsidian if you want a knowledge app on Android, iOS, Linux, macOS, and Windows and prefer its sync option: Sync Standard is $5 a month, billed annually, for one synced vault, 1 GB total storage, and a 5 MB maximum file size. TheBrain is the better match when its graph views, AI, local API, or team editing matter more.

Lattics is another freemium option for users who want its project limits, including 50 graph nodes and 50 timeline nodes per project on Basic, plus daily PDF translation and OCR allowances. TheBrain suits those who prioritize multiple views, AI, and shared-brain collaboration.

Pick Logseq if a free app for personal use is the priority; its Free plan is free, free forever for personal use. TheBrain is the stronger fit when you need its paid sync tiers, Cerebro AI, or team features.

Mem Agent is an alternative for readers comparing freemium knowledge apps with a free tier that includes 25 messages to Mem and 25 new notes per month.

Memex is worth considering if you want its iOS and macOS library with core access and offline files on the free plan, or its Study Monthly plan at $4.99 a month. TheBrain offers a broader platform range and a graph-oriented organization model.

Choose Neoma if its Personal plan appeals: free, with every feature and platform, no account, no limits, and no expiry. TheBrain is the alternative for users who specifically want its multi-view knowledge network, AI, or team collaboration.

Reflect is another option for readers comparing networked note-taking apps; Reflect describes itself as open source and has a plan at $10 a month, billed annually.

RemNote is another freemium alternative for readers comparing note and learning tools, with a free plan that includes annotated PDFs, image occlusion cards, handwritten documents, daily file limits, and monthly AI credits.

For more options, see Personal Knowledge Management Software.

Verdict

Choose TheBrain if you want a visual knowledge base that connects ideas, supports several ways to view them, and can stay local on desktop—or if your team needs shared editing and auditing. Its local API and Cerebro AI add useful depth, but the free cloud caps, unsynchronized external files, and possible removal of excess cloud data after a prolonged lapse make it a poor choice as a set-and-forget cloud archive. Users who need dependable synced storage should budget for a paid plan and keep separate copies of important files.