Yes, entirely. Plume is free and open source under the MIT licence, and the 100 MB that comes with an account costs nothing either. There is no paid tier.

Does Plume work offline?

Yes. Plume opens and edits Markdown files on your own computer with no account and no connection, and a vault works the same way: it needs no account and no network unless you link it to one. Sign in only if you want a vault on more than one machine.

Which file types can Plume open?

Markdown in all its spellings — .md, .markdown, .mkd, .mdown, .mkdn, .mdwn, .mdtxt, .mdtext — plus plain text.

How do I make Plume the default app for .md files?

On Windows, right-click a Markdown file, choose Open with, Choose another app, pick Plume and tick Always. Plume can also do it for you from its own menu.

Does Plume send my documents anywhere?

No. Plume has no telemetry. A document only leaves your computer if it is in a vault you have linked to your account on purpose; a folder you merely opened cannot sync at all.

Can Claude or another assistant read my vault?

Yes, through the Plume Vault MCP server. You create an API token, point the assistant at it, and it can keep notes and project memory in your vault as plain Markdown.

What happens if I forget my password?

Ask for a reset link from the sign-in page. It arrives by email, works once, and expires in an hour.

New Plume 0.0.6 is out

Markdown, beautifully set.

Double-click any .md file and it opens instantly. Click a paragraph to edit it where it sits. Make the folder a vault when you want the whole of it joined up — and link it to your account only if you want it on another computer.

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Free and open source · Windows, macOS and Linux · Source on GitHub

It opens the file. That is the whole trick.

Every other Markdown app wants to own your notes first and show them second.

Opens instantly

No workspace to import, no project to set up. Double-click and read.

Edits when you ask

Press the pencil for the raw Markdown. Make, rename and move notes from the sidebar — renaming takes every link with it.

Vaults, when you ask

Name a vault and Plume makes the folder, or claim notes you already have. Backlinks, search and a graph across all of it, no account needed — and it opens there next time. Link it to an account and it syncs.

It also reads Obsidian vaults, renders Mermaid and KaTeX, and gives Claude Code a place to keep project memory. All of it is in the documentation

Light or dark, it reads like a book.

Light, dark and five palettes. Follows your system, or pin it either way.

Code, diagrams and outline. Mermaid and KaTeX render inline.

Editing. Click a paragraph, or Ctrl+E for the whole file.

The graph. How your documents link to each other.

As many vaults as you like, in your own space.

A vault is a folder of your Markdown with an index beside it. Plume never makes one behind your back, and never limits how many you keep.

Plume’s create-a-vault screen: a vault name, a location with a Browse button, and a line naming the folder it will make — **Name it, place it, done.** Plume makes the folder with the name you typed and tells you exactly where it is going.

Plume’s opening screen: the vaults on this computer on the left, and four ways to get another on the right — **Your vaults, on the left.** Make one, claim a folder you already have, bring one down from your account, or just open a file and keep it loose.

The vault list at the foot of Plume’s sidebar, with the open vault ticked and the account beneath it — **Move between them in one press.** The bar at the foot of the sidebar names the vault you are in and lists the rest, the one you are in ticked.

A linked vault in Plume’s sidebar, showing when it last synced and the storage it shares with every other linked vault — **Sync is a separate choice, made per vault.** Signing in links nothing and uploads nothing until you say so.

Unlimited vaults

One per project, one for work, one for everything else — there is no number. The free account holds 100 MB of synced documents in one pool shared across all of them, so a hundred small vaults and one large one look the same to the meter.

Costs nothing to keep local

A vault that never leaves this computer works offline, forever, with no account: notes, backlinks, search, the graph. It uses none of your storage, and nothing nags you to connect it to anything.

They never collide

Two vaults holding a note of the same name are two different notes, and they sync at the same time without meeting. Nothing is merged, and nothing is overwritten to settle a disagreement.

And in any browser

A linked vault opens at plume-md.com/notes.html — the same notes, rendered the same way, on a machine where Plume is not installed. Read them, edit them, save them back.

It opens where you left off

Plume comes back into the vault you were last in, on the note you were last reading. That place is remembered inside the vault and never leaves the computer that wrote it, so a laptop and a desktop each keep their own.

A folder is never silently a vault, and a vault never silently syncs. How the vault model works

Read your Markdown today.

Free, open source, and about as heavy as a feather. Version 0.0.6.

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