Observed arrival · 2026-09-17
Bifolium, a Markdown reader that keeps your notes beside the text
An offline reader and annotator for Markdown files, GitHub repositories, iPhone, iPad, and Mac.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
Field notes
Bifolium renders CommonMark, GitHub Flavored Markdown, and Obsidian-specific features such as wikilinks, callouts, and YAML frontmatter. It keeps highlights and notes outside the source document, then makes them searchable across the library with matching performed on the device. The page also lists support for tables, TeX math, Mermaid diagrams, and code in more than 30 languages, plus export to PDF, HTML, or linked Markdown.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue