Caldera: Turn Your Obsidian Vault into a Living Digital Garden

From Private Notes to Public Garden: Caldera Redefines the Boundaries of Obsidian

Obsidian users often face a contradiction: the vault is a highly private space for thinking, yet much of its content is worth sharing publicly, discussing, and linking. Caldera, the new product ranked #2 on Product Hunt, attempts to solve this pain point—turning your Obsidian vault into a public page that updates automatically, while maintaining a "private by default" principle.

According to its Product Hunt listing, Caldera's core positioning is a "living profile and linked garden." Rather than simply exporting notes as a static website, it lets notes retain their growth quality during publication: each note can be marked as seedling, budding, or evergreen, corresponding to different stages of content maturity. This tiered approach aligns with the philosophy of the digital garden community, but Caldera embeds it directly into the Obsidian workflow.

Obsidian is a note-taking app built on local Markdown files, whose core feature is the "vault"—a folder fully controlled by the user, with all notes stored as plain text on the local machine, independent of the cloud. Obsidian has built-in bidirectional links ([[wikilink]]) and a graph view, allowing notes to reference each other like Wikipedia, which is why it's widely used by knowledge managers to build personal knowledge networks. Precisely because data is fully localized, Obsidian itself does not offer native public publishing capability; users who want to share content usually need third-party static site generators or manual exports—this is the gap that tools like Caldera fill.

Core Mechanism: Selective Publishing and Bidirectional Links

Caldera's most notable design is "privacy first." The official description states clearly: nothing leaves your vault unless you choose it. Meanwhile, sensitive information such as contact details is automatically stripped. This means users don't need to maintain a separate "clean" vault just for public sharing—Caldera handles filtering at the publishing stage.

Another highlight is cross-garden backlinks. If you link to a note in a friend's garden from your own note, a corresponding backlink appears in their garden. This effectively extends Obsidian's internal bidirectional linking logic to the public web, forming a decentralized knowledge interconnection. For users who have long been building knowledge networks in Obsidian, this "portable links" experience has real value.

A backlink is a key concept in the bidirectional linking system: when note A links to note B, B's page automatically shows "which notes reference me." Within Obsidian, this mechanism helps users discover implicit connections between notes. After Caldera extends it to the public web, cross-garden backlinks mean linking relationships are no longer confined to a single person's vault but can establish a visible citation network among different users' public gardens. This design resembles the early internet's blog cross-linking culture and offers infrastructure-level possibilities for decentralized knowledge communities.

Open Source and Self-Hosting: A Pragmatic Choice for Technical Users

Caldera adopts a free, open-source, self-hostable model. Its product category tags include Productivity, Notes, and GitHub, and the maker is Michael Jones. On Product Hunt, the product received 107 votes and 10 comments, ranking #2 for the day.

Choosing open source and self-hosting is no surprise. The Obsidian user base itself tends to be technically savvy and has high demands for data sovereignty. Caldera leaves the "publishing" step under the user's own control—you can use official hosting or deploy it yourself. This model is increasingly common in the note-taking tool ecosystem, but few products seamlessly connect a "public garden" with a "local vault."

Self-hosting means users deploy and run software on their own servers or local environment rather than using a vendor's cloud service. For note-taking tools, self-hosting means the data and code behind the public page are in the user's hands, not passing through third-party servers. This usually requires some technical threshold, such as configuring a domain, running containers, or a static build process, but for users who value data sovereignty and worry about platform lock-in or service shutdowns, self-hosting provides greater controllability and long-term availability.

An Attempt to Implement the Digital Garden Philosophy

The digital garden is not a new concept, but implementation tools have remained scattered. Caldera's differentiation lies in not requiring users to migrate notes but instead layering a publishing layer directly on top of Obsidian. The seedling / budding / evergreen status markers encourage users to publish immature ideas and keep iterating, rather than only publishing finished products.

However, whether such a tool can operate long-term depends on two factors: first, whether the network effect of cross-garden links can form; second, whether self-hosting users can get a sufficiently smooth deployment experience. The number of Product Hunt comments is limited, so it's currently hard to judge the depth of actual community feedback. For users who have accumulated a large number of notes in Obsidian and have public sharing needs, Caldera offers an option worth watching.

The term digital garden originates from Mark Bernstein's 1998 article and was later popularized by practitioners such as Maggie Appleton, referring to a non-linear, continuously evolving way of publishing personal knowledge. Unlike blogs that arrange "finished products" in reverse chronological order, digital gardens emphasize that notes are constantly revised as understanding updates, and encourage publishing "works in progress." The seedling, budding, evergreen tiered terminology comes from this community and is used to indicate content maturity, reminding readers that a note may still be growing rather than being a final conclusion.