Calculist is unclaimed —

Calculist

A simple, powerful thinking tool.·calculist.io

Calculist is an open source, plain-text note-taking system designed for problem solving rather than pure information management. It lets users write nested lists, link thoughts together into knowledge graphs via references and lookups, and compute values using expressions, functions, and variables. Documents are stored as human-readable, version-controllable plain text files. It is offered as both a free desktop app (local storage) and a paid web app (cloud-based, accessible via browser including mobile).

What it's for

Note-taking for problem solvingInline calculations within notesBuilding knowledge graphs through linked listsOrganizing thoughts with collapsible/zoomable listsCreating reusable structured templates (patterns)Semantic formatting via lexicons

Features 14

Collapse and expand lists to reduce clutter
Compute values using expressions, functions, and variables
Create lexicons for semantically meaningful formatting
Define reusable patterns for common structures and forms
Desktop app with local file storage
Link thoughts together through references to form knowledge graphs
Open source under MIT license
Plain text, human-readable markup language
Search mode to find and filter content
Specify source-of-truth lists and embed values through lookups
Version-controllable plain text document storage
Web app with cloud-based storage and mobile browser access
Write thoughts as nested lists
Zoom in/out to focus on specific lists

At a glance

free tieropen sourceself-hostable

TypeWeb app

DeploymentHybrid

PlatformsWeb

CompanyCalculist LLC

Pricing

FreeFree

Desktop only, Local file storage, Download

Desktop only, local file storage

$4/month plan$4/mo

Web and mobile access, Always backed up

$16/month plan$16/mo

Web and mobile access, Always backed up, Prioritized support