Capacities alternatives: 3 free & open-source picks
Compare recorded free and open-source options, their capabilities and operating requirements. Source dates are shown below; licenses, hosted limits and project activity can change.
Typed blocks, relations and database views for people who enjoy seeing the machinery.
licenseAGPL-3.0
runsyour machine or their cloud
installDesktop/mobile package, or Docker image for browser-based self-hosting
enginesBuilt-in AI features connect to OpenAI-compatible APIs using a configured endpoint and key
dataA workspace stores block documents as structured .sy JSON files plus assets on disk; SQLite files hold indexes and auxiliary state; documents can export to Markdown, HTML, PDF, and Word
the catch vs CapacitiesSiYuan exposes blocks, attributes, and database mechanics more directly, so creating and browsing coherent object types is less elegant than in Capacities.
setupThe desktop app installs cleanly, but free cross-device sync is not a turnkey feature: official cloud sync is a paid membership feature and Docker hosting does not transparently become desktop/mobile sync
facts verified 2026-08-10
Notes become objects through attributes, relations and reusable templates.
licenseAGPL-3.0+
runsyour machine or their cloud
installDesktop release package, or Docker Compose/image for a server and browser client
dataNotes, hierarchy, attributes, revisions, and most attachments live in a local or server-side SQLite database named document.db; notes can be exported to HTML, Markdown, or OPML
the catch vs CapacitiesTrilium remains fundamentally tree-first, making typed objects and cross-cutting collections feel bolted on compared with Capacities' object-native design.
setupThe desktop app is straightforward, but cross-device sync and browser access require operating a Trilium server, persisting document.db, and handling backups and upgrades
facts verified 2026-08-10
Capacities with the same object obsession, local data and only 100 MB of free relay storage.
licenseAny Source Available-1.0
runsyour machine or their cloud
installOfficial desktop or mobile installer; optional self-hosted Any-Sync network for advanced deployments
dataObjects are encrypted and stored locally in Anytype's object store; optional encrypted peer/backup-node copies use Any-Sync, and exports are available as Markdown or Any-Block JSON
the catch vs CapacitiesAnytype's typed-object graph is rougher to navigate and gives up Capacities' polished calendar integrations, object workflows, and built-in AI experience.
setupThe recovery Key must be saved because Anytype cannot recover it; local-only users must manage backups, while synced use is subject to the included network-storage allowance
facts verified 2026-08-10
latest recorded source check 2026-08-10 · check current terms at the source
| tool | license | running it | platforms | stars | active |
|---|---|---|---|---|---|
| SiYuan | AGPL-3.0 | one-click install | macos, windows, linux, android, self-hosted, browser-extension | 45,647 | 2026-08 |
| Trilium Notes | AGPL-3.0+ | one-click install | web, macos, windows, linux, self-hosted, browser-extension | 37,278 | 2026-08 |
| Anytype | Any Source Available-1.0 | one-click install | macos, windows, linux, ios, android | — | — |
People still pay for Capacities because people keep paying when the note system is trusted across every device and disappears into their daily capture habits. The recurring cost buys file watching, conflict handling, indexing, mobile apps, encryption, backups, and migrations, not just the visible interface. The recorded subscription totals $143.88 a year before any costs of an alternative.
Questions about these alternatives
Is there a free alternative to Capacities?
Yes: SiYuan, Trilium Notes, Anytype. These are recorded free or open-source options. Compare their feature limits, licenses, hosting costs and current availability before choosing.
Should I just build my own Capacities?
Our verdict is YES. The core loop is small enough for a capable coding agent to produce a useful local version in one sitting. For Capacities, organize linked notes as typed objects such as people, books, meetings, and ideas. The hard boundary is object-model polish, mobile capture, sync, calendar integration, and ai features, plus sync, collaboration, and capture polish. Review the scope, implementation prompt and trade-offs in the Capacities build guide.
