TheBrain

Overview

TheBrain is a knowledge-management app for linking notes, files, web links, projects, and AI in a visual network. It is a strong fit for people who think in connections and want to keep desktop data local, as well as teams that need shared editing. Its main trade-off is that free cloud sync and attachment storage are tightly capped.

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 less compelling for anyone who prefers a strictly linear or folder-first system, but its several views make the graph more adaptable than a single network diagram.

Key features

TheBrain 15 includes Card View, Mind Map, and Tree View. Being able to switch between these views helps when a network is useful for finding relationships but a card or tree layout is clearer for reviewing a specific set of material.

Cerebro AI can create content, search and summarize a brain, suggest links, and converse using its knowledge. This makes the AI relevant to an existing knowledge base rather than limited to standalone content generation. Free users get a limited daily allowance; Pro Service includes Cerebro AI, and Max Service provides four times the AI usage of TeamBrain. Inputs may be processed by contracted AI providers, a consideration for sensitive material. TheBrain says it does not sell personal information or use private synced content for advertising.

The local API in TheBrain 15 lets scripts and external tools create and link thoughts, run commands, and query brain data. That is a useful option for people building integrations around their knowledge base. Brains are local by default, and Windows, Mac, and Linux users can keep data on their devices without cloud sync. External files and folders linked from a brain but stored elsewhere do not sync, so cloud users need to plan around that distinction. The privacy policy describes administrative, technical, and physical safeguards, including encryption in transit and protections for data at rest.

Pricing

The 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. It is a sensible way to use TheBrain locally or try its full feature set, but the sync and attachment allowances make it a poor fit for a large cloud-based library.

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. This is the clearest upgrade for an individual who needs cloud sync without the free thought cap.

TeamBrain costs $25 a month, billed $299 per person / year. It includes Pro Service features plus multi-user editing and sync, unlimited shared brains, 100 GB of storage, per-user reporting and auditing, and priority support. Its per-person annual billing matters for teams budgeting seats; it is not simply a flat team price.

Max Service costs $40 a month, billed $479 / year. It adds four times the Cerebro AI usage of TeamBrain, 250 GB of online storage, unlimited sync devices, and early feature access, while retaining TeamBrain features and priority support. It suits users who need those higher limits, rather than people seeking only basic sync. Enterprise has custom pricing and on-premises server deployment.

If a paid plan lapses for six months or more, cloud data beyond the free limits may eventually be removed to reclaim storage. That makes maintaining a subscription important for users relying on cloud capacity above the free allowance.

Platforms

TheBrain supports Windows, macOS, Linux, iOS, Android, and the web, and also provides an API. Local use and offline access are notable advantages on desktop; users who need synced attachments should remember that externally stored files and folders are excluded from sync.

Who it's for

TheBrain is best for individuals building a connected body of notes and projects, especially those who value local desktop storage, multiple ways to view information, or AI that can work with a knowledge base. TeamBrain is the relevant tier for collaborative editing and shared brains. It is less suitable for users who need generous free cloud storage or want external linked files synchronized automatically.

Pros and cons

• Pros: Unlimited thoughts, links, and brains on the free app mean users can build a substantial local knowledge base without a content-count ceiling.
• Pros: Card, mind-map, and tree views offer alternatives to navigating everything as a graph.
• Pros: Local storage, offline access, and an API support users who want data on desktop or integrations with scripts and tools.
• Cons: Free private sync stops at 1,000 thoughts and 100 MB of synced attachments, limiting its usefulness as a cloud-first library.
• Cons: Externally stored linked files and folders do not synchronize, so they can remain unavailable across synced devices.
• Cons: Cloud data beyond free limits may eventually be removed after a paid plan has lapsed for six months or more.
• Cons: Cerebro inputs may be processed by contracted AI providers, which may not suit users who cannot send material to external providers.

Alternatives

For a broader comparison of this category, see Personal Knowledge Management Software.

Choose SiYuan if open-source software and a free plan are priorities; it spans desktop, mobile, web, extension, and self-hosted platforms.

Supernotes is an alternative for people who prefer organizing knowledge as cards; its Unlimited plan costs £6 a month, billed £72 billed annually.

TiddlyWiki is a free, open-source project for readers who want a no-cost alternative.

Capacities is another freemium choice; its Basic plan includes 5 GB of media uploads total, then 100 MB per month.

Logseq is free for personal use and may suit readers seeking a free alternative; its Sync Backer option is a monthly recurring donation with beta sync access.

Neoma offers a free Personal plan across its listed platforms, with no account, limits, or expiry.

Obsidian is an alternative for readers who want to compare a freemium knowledge tool with a paid sync plan; Sync Standard costs $5 a month, billed annually, with one synced vault and 1 GB total storage.

SilverBullet is a free alternative with personal-use and education options, including sync with any SilverBullet Server.

Verdict

Choose TheBrain if you want a visual, connected knowledge base with local desktop use, multiple views, and optional AI that can work with your material. Its free app is generous on thoughts but not on cloud sync or attachments, so users who depend on synced storage should budget for a paid plan and account for its lapse terms. Look elsewhere if those limits or AI-provider processing are incompatible with your needs.