Project Medusa is layout software in the browser for multi-page print work. It sets type with paragraph and character styles, master pages and spot colours, opens and writes IDML and exports a print PDF built to PDF/X-4 that it checks itself.
Medusa runs in any current browser. Adobe InDesign is a desktop program for Windows and macOS; in the browser it offers text editing with InCopy on the web (beta) and review links.
Source: Adobe: InDesign technical requirements · Adobe: Edit InDesign documents with InCopy on the web (beta) · Adobe: Share documents with review links
In Medusa several people work on the layout at once, even in the same paragraph. InCopy on the web edits text only and locks a frame while someone is writing in it.
Source: Adobe: Edit InDesign documents with InCopy on the web (beta)
Clients change text through a link right in the locked layout and approve it, without an account. InCopy on the web needs an Adobe ID.
Source: Adobe: Edit InDesign documents with InCopy on the web (beta)
Medusa sets EAN, ISBN, UPC, Code 128, GS1-128, QR, DataMatrix and PDF417 as vectors, per record too. The InDesign help describes a generator for QR codes.

Columns and bars, stacked and 100 %, lines, area, pie, doughnut and pictogram, from numbers you type or paste from Excel. Linked to a table or an Excel file, they follow every change.

An org chart from an indented list, flows from shapes with text, node diagrams with inputs and outputs. Connectors are straight, right-angled, rounded or curved, and they follow when shapes move.

Cells starting with «=» calculate: SUM, ROUND to 0.05, IF, references to other tables and document values such as VAT. A calculated field brings the total into the text, numbers align on the decimal point.

EAN, ISBN with price add-on, UPC, Code 128, GS1-128, QR code with logo, DataMatrix and PDF417, as vectors in any colour, with check digit and human-readable text, per record too.
For multi-page print work, catalogues and ads, yes: Medusa works with paragraph and character styles, master pages, spot colours and prepress checks, opens and writes IDML and runs in the browser. Medusa is in beta.
Yes, through IDML (in and out), with styles, tables and footnotes.
Yes. The print PDF is built to PDF/X-4, with output intent and XMP identification. Medusa reads the finished file back in and checks it; «PDF/X-4» is only written when the file passes. This is not an independent certification.
No. Medusa runs in current versions of Chrome, Edge, Firefox and Safari.
Create a profile with your name and email address. New profiles are approved by hand; after that you open a document and send the link.
Documents, images and accounts are currently stored with Hostinger, the provider of the medusa.id42.xyz server. The site has no trackers and loads nothing from third parties, not even fonts. Background removal runs in the browser; the image never leaves your computer. AI features only run when you switch them on.
No. A link is enough to correct and approve; the layout stays locked.
Reading, commenting, changing text, approving: yes. Designing on a bigger screen.