Documents and notes decision
Capacities
A capable developer can build a useful single-user PKM with objects, backlinks, graph view, and search in about a week, but reproducing Capacities' product polish, EU-hosting/GDPR commitments, integrations, and community-backed trust is larger effort—so expect a narrower DIY replacement rather than a full commercial clone.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Capture a daily note -> convert snippets into structured objects (project, person, book) -> create/link objects -> query/search and surface related content
What it still won’t have
- Polish and UX refinements of a mature product (mobile clients, advanced editor niceties)
- Official EU-hosted, GDPR-specific infrastructure guarantees
- Built-in integrations (calendar, Readwise/Kindle, WhatsApp/Telegram quick capture) out of the box
- Community, support, and product roadmap responsiveness
- Pro-level AI features and any fair-use hosting allowances
What remains hard
- Brand trust
Trusted by 50,000+ knowledge workers · Featured in Fast Company
- Compliance and regulation
Hosted in Europe. GDPR compliant. Encrypted Servers.
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 5 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a single-user web app for personal knowledge management using Next.js + React, Tailwind, Postgres (hosted on Supabase), and Meilisearch. Implement: 1) a block-based rich text editor that saves notes and supports embeds (images, PDFs); 2) an object schema layer allowing custom object types with properties and templates; 3) automatic creation of bi-directional links and a backlinks panel; 4) a graph view (D3 or visx) that visualizes objects and links; 5) full-text search and a related-content scanner that suggests implicit connections; 6) simple auth (email/password or Supabase OAuth), per-user data isolation, and S3-compatible media storage. Out of scope: multi-user collaboration features, mobile native apps, enterprise billing, and GDPR-certified hosting SLAs. Include tests for API endpoints and core business logic, sensible error handling, and a README with local dev + deployment steps.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- 3/3 assessment runs agreed+4
- Hard moats found in the evidence-3
- Evidence score61
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 5
Every page the run actually retrieved.
- official productCapacities
- official pricingPricing | Capacities
- official docsProduct - Note-taking that works the way you think | Capacities
- open sourcelogseq/logseq
- open sourceTriliumNext/Trilium
Integrity checks
What held up, and what did not.
