3 alternatives to Capacities
Compare free and open-source solutions before building your own. Check each option’s license, setup, and limitations.
Typed blocks, relations and database views for people who enjoy seeing the machinery.
LicenseAGPL-3.0
PlatformsOn your machine or in the cloud
InstallationDesktop/mobile package, or Docker image for browser-based self-hosting
ModelsBuilt-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
Limitations compared to 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+
PlatformsOn your machine or in the cloud
InstallationDesktop 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
Limitations compared to 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
PlatformsOn your machine or in the cloud
InstallationOfficial 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
Limitations compared to 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
Updated 2026-08-10 · no paid listings
| Tool | License | Setup | Platforms | Stars | Activity |
|---|---|---|---|---|---|
| SiYuan | AGPL-3.0 | One-click installation | macos, windows, linux, android, self-hosted, browser-extension | 45,647 | 2026-08 |
| Trilium Notes | AGPL-3.0+ | One-click installation | web, macos, windows, linux, self-hosted, browser-extension | 37,278 | 2026-08 |
| Anytype | Any Source Available-1.0 | One-click installation | 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. If those points do not matter to you, the options above could save $120 per year.
Is there a free alternative to Capacities?
Yes: SiYuan, Trilium Notes, Anytype. This page lists 3 free or open-source options. Check the limitations of each.
Should I build my own Capacities?
Our verdict: Buildable. 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. The complete prompt is on the Capacities page on Vibe Radar.
