Notesium

Spec sheet

What it does

Notesium is a local system for creating, storing and accessing linked Markdown notes.Read 15 Oct 2026 · notesium.com

Purpose

Notesium is an indexer for bidirectionally linked notes designed for Zettelkasten and Evergreen note-taking.Read 5 Oct 2026 · notesium.com

Intended users

The maker describes use cases including personal notes, knowledge bases, journaling, research, book writing, and workout tracking.Read 5 Oct 2026 · notesium.com

Platforms

The maker says Notesium runs locally on Linux, macOS, and Windows.Read 5 Oct 2026 · notesium.com

API

The local REST API uses JSON and exposes endpoints to create, update, delete, retrieve and list notes.Read 15 Oct 2026 · notesium.com

Integrations

Notesium provides a Vim/Neovim plugin that uses its CLI for note finding and preview.Read 5 Oct 2026 · notesium.com

Security

The installation guide instructs users to verify downloaded binaries against published SHA-256 checksums.Read 5 Oct 2026 · notesium.com

License

The repository identifies the project as MIT licensed.Read 15 Oct 2026 · github.com

Maker

The site credits Alon Swartz in its copyright notice.Read 15 Oct 2026 · notesium.com

API data model

The documented note object includes filename, title, label status, incoming and outgoing links, timestamps, counts, path and content.Read 15 Oct 2026 · notesium.com

API stability

The API documentation calls the interface unstable and says it has no explicit versioning.Read 15 Oct 2026 · notesium.com

API write control

API writes are forbidden unless the daemon is started with the --writable option.Read 15 Oct 2026 · notesium.com

Bidirectional links

Links create outgoing and automatically discovered incoming relationships between notes.Read 15 Oct 2026 · notesium.com

CLI

Notesium includes a command-line interface with list, links, lines, finder, statistics, web and version commands.Read 15 Oct 2026 · github.com

Custom URI

Notesium documents a custom notesium:// URI protocol for opening notes and actions.Read 15 Oct 2026 · notesium.com

Editor

The embedded web editor supports Markdown syntax highlighting, section folding, table formatting, and Vim mode emulation.Read 5 Oct 2026 · notesium.com

File naming

Note filenames use deterministic eight-character hexadecimal identifiers derived from Unix epoch time.Read 15 Oct 2026 · notesium.com

Graph

An interactive force graph visualizes note relationships and supports search filtering, preview, zoom, and layout adjustments.Read 5 Oct 2026 · notesium.com

Graph view

An interactive force graph visualizes relationships and supports filtering, previews, zooming and layout-force controls.Read 15 Oct 2026 · notesium.com

Installation

Prebuilt binaries are provided for Linux, macOS and Windows, with SHA-256 checksum verification instructions.Read 15 Oct 2026 · notesium.com

Knowledge models

The product is designed for Evergreen notes, Zettelkasten workflows and personal knowledge management.Read 15 Oct 2026 · notesium.com

Labels

A note with a one-word title is treated as a label and can organize linked notes into a taxonomy.Read 15 Oct 2026 · notesium.com

Latest release

GitHub lists v0.6.5 as the latest release, published 20 July, with Vim/Neovim improvements and rewritten web tab management.Read 15 Oct 2026 · github.com

Link insertion

Typing double brackets in the web editor or Vim integration opens a finder that inserts a Markdown link.Read 15 Oct 2026 · notesium.com

Linking

Typing `[[` in the web editor opens a finder to insert a link, and saved notes are linked bidirectionally.Read 5 Oct 2026 · notesium.com

Local deployment

The embedded web interface is self-contained and runs locally on the user's machine.Read 15 Oct 2026 · notesium.com

Performance

The maker reports a 6.3 MB Linux build and 11.4 MB system memory for its web and API setup, noting that actual performance varies by system and usage.Read 5 Oct 2026 · notesium.com

Performance claim

The official site reports an example Linux binary size of 6.3 MB, 11.4 MB total memory for web/API and 0.008 seconds for a sample CLI operation.Read 15 Oct 2026 · notesium.com

Periodic notes

Daily and weekly notes are implemented by the web and Vim interfaces through deterministic creation-time conventions.Read 15 Oct 2026 · notesium.com

Project maturity

The README describes Notesium as experimental and proof-of-concept software.Read 15 Oct 2026 · github.com

Release limitation

The v0.6.5 notes say asset support and side-by-side tab groups were only groundwork for future features.Read 15 Oct 2026 · github.com

Repository activity

The GitHub repository page showed 164 stars, 11 forks, 817 commits, 8 issues and 2 pull requests when opened.Read 15 Oct 2026 · github.com

Search

The CLI, Finder and web interface provide full-text search across notes.Read 15 Oct 2026 · github.com

Source repository

The public GitHub repository is written in Go and contains the CLI, web, Vim integration, API and tests.Read 15 Oct 2026 · github.com

Storage

Notes are kept as Markdown files in one flat local directory rather than a hierarchy of folders.Read 15 Oct 2026 · notesium.com

System support

The project says it is primarily tested and supported on Linux, with only preliminary testing on macOS and Windows.Read 15 Oct 2026 · github.com

Titles

A note title is inferred from its first line, optionally written as a Markdown heading.Read 15 Oct 2026 · notesium.com

Vim integration

A Vim/Neovim plugin integrates with the CLI Finder and supplies commands for notes, links, search, web access and periodic notes.Read 15 Oct 2026 · notesium.com

Web editor

The embedded editor provides Markdown highlighting, concealment, section folding, table formatting and optional Vim-mode emulation.Read 15 Oct 2026 · notesium.com

Plans and prices

Every Notesium plan and price →

Where Specifiction places it

• Personal Knowledge Management Software#7 of 328.7