Observed arrival · 2026-09-08

Sideleaf, a quiet Markdown editor with notes in the margin

sideleaf.xyz Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A free, open-source desktop editor for writing, previewing, and annotating local Markdown files on macOS and Windows.

Landing page captured for the 2026-09-08 issue.

Field notes

Sideleaf works with ordinary local Markdown files rather than an online writing account. Its distinctive mechanism is passage-level commenting: notes follow edits and undo history, then live in a companion file beside the document. The displayed release is 0.1.1, with tabs, image previews, and unsaved-draft recovery listed as future work. Mac support is described as signed and notarized, while the Windows setup is an unsigned ZIP requiring Windows 11 x64 and WebView2.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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1985 at 160× Speed

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