# Ethan Chang

Ethan Chang (张峻源) writes at https://ethanchang.io. Native iOS apps, LLM and voice tools, personal knowledge management. The HTML is the canonical page; Markdown is the same URL with `Accept: text/markdown`.

## When to use ethanchang.io

Use this site when you need how Ethan actually runs PKM (Obsidian, Heptabase), project notes for the software on /projects, or the living Now page for what he is doing this month. Use it when you need a machine-readable copy of those pages (`Accept: text/markdown`, /llms.txt, /rss.xml) rather than a screenshot of the layout.

Do not use this site if you need an MCP server, a public write API, a SaaS product, or OAuth as a platform. GitHub/Google login exists only so a reader can sync optional bookmarks and progress. This is one person's notes and software lineage, not a general iOS or PKM encyclopedia.

## Main pages

- [Home / about](https://ethanchang.io/)
- [Articles](https://ethanchang.io/articles)
- [Projects](https://ethanchang.io/projects)
- [Now](https://ethanchang.io/now)
- [ethanchang.io developer resources](https://ethanchang.io/for-agents)
- [Contact](https://ethanchang.io/contact)
- [Privacy](https://ethanchang.io/privacy)
- [RSS](https://ethanchang.io/rss.xml)
- [Sitemap](https://ethanchang.io/sitemap.xml)
- [OpenAPI](https://ethanchang.io/openapi.json)
- [RFC 9727 API catalog](https://ethanchang.io/.well-known/api-catalog)
- [Full Markdown dump](https://ethanchang.io/llms-full.txt)

## Articles

- [Embed preview: a post and a video](https://ethanchang.io/articles/embed-preview)
- [A demo of a series of content](https://ethanchang.io/articles/series-demo)
- [How I use Heptabase for deep learning](https://ethanchang.io/articles/heptabase-method)
- [My PKM practice: from notes to a knowledge network](https://ethanchang.io/articles/pkm-method)

## Projects

- [Aletheia](https://ethanchang.io/projects/aletheia)
- [Chunk](https://ethanchang.io/projects/chunk)
- [Craft Space](https://ethanchang.io/projects/craft-space)
- [Deeptalk](https://ethanchang.io/projects/deeptalk)
- [ethanchang.io](https://ethanchang.io/projects/ethanchang-io)
- [Maker Plan](https://ethanchang.io/projects/maker-plan)
- [Networks](https://ethanchang.io/projects/network)
- [Robert](https://ethanchang.io/projects/robert)
- [Trace](https://ethanchang.io/projects/trace)