Who it is for
Note-takers who prefer typed, linked objects to folders of freeform documents.
Object based note-taking and structured personal data
Overview
Capacities is a note system built on objects rather than files. A person, a book, a project, or an idea each becomes its own object with properties attached to it, and notes are written against those objects instead of into loose documents.
Because objects carry structure and can point at each other, the collection behaves as a network. The link between a book and the person who recommended it, or between a project and the notes taken on it, is part of the data rather than something reconstructed by search.
The short description frames the ChatGPT app as a way to reach that store of personal knowledge. The record does not spell out which write operations, if any, are available through it.
Note-takers who prefer typed, linked objects to folders of freeform documents.
Structure comes from typed objects and their properties, so a book and a person are stored differently rather than as identical pages.
Availability
Capacities is listed in the ChatGPT apps directory only. Capacities Labs GmbH has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
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This is an independent catalogue entry compiled by Node8 from Capacities's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Capacities Labs GmbH, and inclusion here is not an endorsement.
Node8 builds MCP servers end to end: deciding which tools are worth exposing, the authentication and permission model, the review submissions, and the onboarding that gets them used. One server serves ChatGPT, Claude, and Microsoft Copilot.