Hubbele is a free, open source notetaking application built for both you and your agents. The app is backed by Markdown and HTML, offering a flexible foundation for capturing ideas, tasks, and references. Its design emphasizes simplicity and extensibility, allowing seamless integration with automated workflows.

The sample notes showcase a wide range of entries: from travel observations like Kyoto garden, Tokyo ramen, and Lisbon trams to outdoor logs such as Joshua Tree trails, Big Sur tide pools, and desert star maps. Tags cover cooking, books, field guides, and personal reflections, illustrating the app’s versatility for diverse content types.

Users can organize notes with tags, places, and custom categories, while agents can parse the structured Markdown for further processing. The interface appears minimal, focusing on quick capture and retrieval. A recent update added three new ideas for future development, signaling active iteration.

Originally shared on Hacker News, Hubbele positions itself as a modern notepad that bridges human note‑taking and machine readability, all without licensing fees.