TheBrain

Overview

TheBrain is a knowledge-management app that links notes, files, web links, projects, and AI in a visual network. It suits people who want to navigate information through relationships and keep their data local on desktop, as well as teams that need shared editing. Its main trade-off is that free cloud sync and attachment storage are capped.

Founded in 1996 and headquartered in Los Angeles, TheBrain offers a graph-based approach to organizing information, with backlinks, offline access, and import and export support. Instead of relying on a single list or folder hierarchy, users can connect related items and move among them as a network.

Key features

TheBrain 15 offers Card View, Mind Map, and Tree View, giving users several ways to inspect the same knowledge base. That flexibility is useful when a graph is helpful for discovering connections but not the clearest way to review a particular set of information.

Cerebro AI can create content, search and summarize a brain, suggest links, and answer questions using its knowledge. The free plan includes a limited daily AI allowance; Pro Service adds Cerebro AI, while Max Service provides four times the AI usage of TeamBrain. Users should also weigh the privacy terms: inputs to Cerebro may be processed by contracted AI providers. TheBrain says it does not sell personal information or use private synced content for advertising.

TheBrain 15's local API lets scripts and external tools create and link thoughts, run commands, and query brain data. That makes it a stronger fit for users who want to work with their knowledge base programmatically. Brains are local by default, and Windows, Mac, and Linux users can keep data local without cloud sync. External files and folders linked from a brain but stored elsewhere do not sync, so that workflow needs separate file management.

Pricing

TheBrain is freemium, with paid plans starting at $15 a month. The free plan costs nothing, billed $0 forever, and 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 capable entry point, but the sync and attachment caps matter if the brain becomes a primary cloud workspace.

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 paid fit for an individual who needs more cloud capacity and support without team editing.

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 price suits teams that need shared work and oversight; it is a substantial step up from an individual subscription.

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, priority support, and early feature access. It is aimed at heavy users who will make use of the extra AI and storage, rather than those who only need a shared brain. Enterprise has custom pricing and offers on-premises server deployment.

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

Platforms

TheBrain supports Windows, macOS, Linux, iOS, Android, and the web, with an API also available. The desktop local-use option is particularly relevant for people who prefer not to sync their brains to the cloud; free cloud sync limits still apply to those who do sync.

Who it's for

TheBrain is a good choice for people who think in connections and want notes, projects, links, and files represented together, especially when multiple views or a local desktop brain matter. Its API and team plans also make it worth considering for technically inclined users and groups that need shared editing or reporting. It is less compelling for someone who wants generous cloud attachments at no cost, or a simple notes app without a graph-centered model.

Pros and cons

• Pros: Multiple views let users inspect a knowledge network as cards, a mind map, or a tree.
• Pros: Local-by-default brains and offline access suit users who want to work without cloud sync.
• Pros: The API supports scripted creation, linking, commands, and queries for users who want programmatic access.
• Cons: Free cloud sync covers up to 1,000 thoughts and 100 MB of synced attachments, limiting its usefulness as a growing cloud archive.
• Cons: Linked external files and folders do not synchronize, so they can be unavailable on another device even when the brain syncs.
• Cons: Cerebro inputs may be processed by contracted AI providers, which may not suit users who prefer not to send AI requests for processing.

Alternatives

For other approaches to this category, see Personal Knowledge Management Software.

Choose SiYuan if open-source software and a self-hosted option are priorities; it is freemium, has a free trial, and supports desktop, mobile, and web platforms.

Logseq is a free alternative for personal use, with a paid Sync Backer option at $5 a month billed as a recurring monthly donation for sync beta access.

Consider Obsidian if its freemium model and separate Sync Standard plan fit better; that plan is $5 a month billed annually and includes one synced vault, 1 GB total storage, and a 5 MB maximum file size.

Supernotes is another freemium option, organized around cards; its Unlimited plan costs £6 a month, billed £72 billed annually.

Pick Capacities if its Basic plan's 5 GB of total media uploads and 100 MB monthly uploads thereafter better fit your needs.

Mem Agent is a freemium alternative available on web, desktop, iOS, and as an extension.

Tana offers a free plan with five meetings per month, one calendar, and 50 AI queries; its Pro plan is listed at $2,030 a month per user as an early-bird price.

TriliumNext Notes is a free, open-source option with no paid tiers and no account requirement.

Verdict

Choose TheBrain if you want a connected knowledge base with multiple views, local desktop use, and the option to add AI or team collaboration as needs grow. Its graph model and API are meaningful strengths, but the free sync and attachment allowances are small, and external linked files do not sync. Look elsewhere if generous free cloud storage or a simpler notes workflow matters more than navigating information through relationships.