Observed arrival · 2026-10-16

macgram: a live Merise/UML editor

macgram.app Visit website

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

A free browser and desktop editor for drawing Merise/UML data models, with the relational model generated as you work.

Landing page captured for the 2026-10-16 issue.

For: Merise/UML learners and data-modeling teams
Worth noticing: Its line-oriented JSON format is described as git-friendly, and it can import Looping .loo files.

Field notes

The editor stores diagrams as readable .mcd.json files, with one element per line; the page says this keeps Git diffs clean and merges conflict-free. It can import Looping .loo files, translating their rules into notes, and offers PNG/SVG export. Keyboard shortcuts cover tools and actions such as search, duplicate, and undo. The desktop download section lists Windows 10/11 and several Linux package formats; account-based online storage and sharing are still described as forthcoming.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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