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Formiko vs Markdown Viewer: catalog facts
Formiko	Markdown Viewer
Free Free and open source under the BSD-3-Clause license.	Free The Apache-2.0 licensed application is distributed without charge.
Linux	Windows, macOS, Linux, Web
Live preview for reStructuredText and Markdown Supports multiple Docutils output formats	Live preview renders diagrams, maps, charts, math, and 3D models. Organizes documents into workspaces and folders with search and tabs.
The Vim editing mode requires an embedded Neovim instance.	Remote diagram rendering, GitHub import, and sharing require network access.
Downloadable app	Downloadable app, Web application
Open source	Open source
License: BSD-3-Clause	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 6, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.