Capacities
A note-taking app that organizes information as linked objects instead of files and folders.
Alternatives
Choose Obsidian if…
- you need local markdown files you can edit with any editor
- you want to avoid subscription fees for core syncing
- you prefer a massive plugin ecosystem for custom workflows
- you require instant offline performance without relying on
Choose Mem if…
- you need AI chat that answers from your own notes
- you want PDFs to become searchable instantly
- you rely on native Mac, Windows, or iOS apps
- you prefer a freemium tier that isn’t just a trial
Choose Supernotes if…
- you need real‑time multi‑user editing
- you want a 2D/3D graph to see idea connections
- you prefer a fixed‑size free tier with 100 cards
- you need rich‑content notecards (tables, equations,
Choose Roam Research if…
- you need real‑time co‑authoring of notes
- you want to automate entry via an open API
- you rely on a web‑only interface across devices
- you prefer a query language for dynamic reports
Choose Foam if…
- you need a zero‑cost, open‑source solution you can run
- you want to customize the app with community or custom
- you prefer plain‑text Markdown files stored in Git for
- you’re comfortable with a steeper learning curve to gain
How to Decide
Capacities is known for its object‑based note system that links people, projects, books and other typed objects, and it’s used by writers, researchers, students and other knowledge workers. The alternatives split into a few clear camps: Mem leans on AI‑powered automatic organization and caps AI chats and PDF processing at 25 per month on its free tier; Roam Research emphasizes real‑time collaboration and an open API for automation; Obsidian is distinguished by local‑markdown storage with a massive plugin ecosystem and optional paid sync/publish add‑ons; Foam stands out for being free, open‑source and highly customizable via its plugin architecture and graph‑database backend; Tana is chosen for its flexible supertag system and built‑in integrations such as Slack and Zapier.
All Alternatives
“Heptabase visualizes notes, PDFs and whiteboards as connected objects, aligning with Capacities' structured linking.”
“Capacities organizes information as linked objects, providing the same non‑linear, graph‑based workflow.”
“Roam Research provides instant bi‑directional linking and networked thought, a core use‑case similar to Capacities.”
“Obsidian offers a local‑first, markdown‑based knowledge base with powerful linking, a close alternative for networked notes.”
“Foam is an open‑source, graph‑based note‑taking tool that emphasizes networked, typed content like Capacities.”
“Tana uses flexible supertags for structured, typed objects, matching Capacities' object‑based PKM approach.”
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