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Hubble.md
Pricing
- Model
- Free
Summary
Most note apps quietly collapse the moment an AI agent tries to write into them — the folder structure fights back, the tags are human-only, and the whole system assumes a person is typing. Hubble.md is a Markdown-backed notepad built to accept input from both you and your agents without a fight.
Hubble.md stores notes as plain Markdown files, so anything that can write text can write a note — a script, an agent, a human. The page describes a tagging and topic system visible in the UI, covering categories like travel, cooking, and outdoors, with a file-per-note structure that keeps things portable. The 'Build any view' call-out suggests you can render custom HTML views over your notes, which matters if you want a map or bookshelf layout rather than a flat list. The project is open source and self-hostable, so your notes stay where you put them. At 61 GitHub stars, this is an early-stage personal tool, not a team system with a support tier behind it.
Bottom line: Pick Hubble.md if you want a dead-simple, self-hosted Markdown notepad that an agent can write into without special integration — skip it if you need collaborative editing, mobile sync, or anything resembling a search index across hundreds of notes.
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Pros
Sign in to edit- Plain Markdown file storage, so any script or agent can write a note without an API or authentication layer — you avoid the integration overhead that blocks most automated note pipelines.
- Self-hosted and open source, which means your notes never touch a third-party server and you are not locked into a subscription to keep accessing your own data.
- Custom HTML view layer, so you can render the same Markdown notes as a map, a bookshelf, or a structured index without duplicating your data into a separate presentation system.
- Tag and topic organization baked into the structure, so notes about travel, cooking, or any other domain stay grouped without manual sorting on every insert.
Cons
Sign in to edit- No search index is described on the project page. Once your note collection grows past what you can browse by eye, finding a specific note means falling back to filesystem grep — at that point you are maintaining your own tooling on top of what is supposed to be the tool.
- Solo maintainer with 61 stars and no documented license means no guaranteed update cadence, no security patch pipeline, and no issue SLA. Teams that need a note store with any uptime or continuity expectation move to something like Obsidian with a sync plugin or a self-hosted Outline instance instead.
- No mobile or sync layer described anywhere on the project page. If your workflow involves capturing notes on a phone or across multiple machines, Hubble.md offers nothing to bridge that gap — you handle sync yourself or you don't use it on the go.
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About
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-07-04T03:17:08.773Z
Best For
Who it's for
- Users seeking simple Markdown notes
- AI agent workflows needing note storage
- Lightweight open-source note apps
What it does well
- Personal note-taking with Markdown
- Organizing agent-generated content
- Building custom note views
- Managing topic-specific notes like travel and recipes
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Frequently Asked Questions
- Is Hubble.md free?
- Yes — Hubble.md is fully free to use. There is no paid tier.
- Is Hubble.md open source?
- Yes. Hubble.md is open source.
- Can I self-host Hubble.md?
- Yes. Hubble.md supports self-hosting on your own infrastructure.
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Curated lists that include this category
Hubble.md is an open-source notepad that stores everything as Markdown and HTML files. The core workflow is file-in, file-out: you create notes, tag them by topic, and the tool organizes them into a browsable structure. The interface shown on the project page groups notes by tag — travel, cooking, outdoors — and lets you navigate across them. Because the underlying format is plain Markdown, any process that can write a text file can add a note, which is the premise behind the ‘agent ready’ label.
The standout feature is the ‘Build any view’ capability. Rather than locking you into one list layout, Hubble.md lets you render custom HTML views over your note collection — a map view, a bookshelf, an index page. This is the differentiator from a standard Markdown editor: the data layer and the display layer are separated, so you can write a note in the same format whether you’re building a recipe index or a travel log, and then surface it differently depending on the context.
Hubble.md fits a narrow but real use case: a single user who wants local, self-hosted notes that an AI agent can write into as part of a larger workflow. It does not fit teams, it does not appear to offer search across large note collections, and there is no mobile app or sync layer described on the project page. The project is early-stage by any observable measure — 61 GitHub stars, a solo maintainer, no documented license on the validator pass. Teams that start here and grow past a few hundred notes will likely hit the ceiling of a flat file system before they hit any feature ceiling.