---
title: "Sonde"
section: open-source
description: "An AT Protocol explorer that started as a way to render the byte-array memory Koios stores on its PDS."
tags: ["at-protocol", "explorer", "pds", "open-source"]
created: 2026-01-27T12:22:00Z
updated: 2026-07-16T14:56:30Z
cid: bafkreibe55moildjegfcodfb4i4jzdjawaw526dwu6izj2ucbwyzp3n2ai
html: https://iammatthias.com/open-source/1769545357371-sonde
---

# Sonde

[REPO](https://github.com/iammatthias/sonde)

[PROJECT](https://sonde.blue/)

What started as a way to render the byte-array memory that [Koios](https://koio.sh/) stores on its PDS quickly snowballed into something else. [sonde.blue](https://sonde.blue/) is a new AT Protocol explorer. It has issues, is rough around the edges, and I'm having a lot of fun with it right now.

---

## Related

- [atproto-wc](https://iammatthias.com/open-source/1776737859309-atproto-wc.md): Framework-agnostic web components for ATProto
- [Nimbus](https://iammatthias.com/open-source/1768762943567-nimbus.md): AT Protocol repository sync with Cloudflare Workers built on Tap
- [Notes on using a PDS as Content Infrastructure](https://iammatthias.com/posts/1767505149657-notes-on-using-a-pds-as-content-infrastructure.md): Content addressing with normal web requests, identity baked in, delivery over boring HTTPS.
- [llm-txt.fun](https://iammatthias.com/open-source/1767381212267-llm-txt-fun.md): LLM-TXT provides tools to generate files from Farcaster, Bluesky, RSS feeds, and Git repos, building on my earlier llm-fid project.
- [BHVR-x402](https://iammatthias.com/open-source/1767375877152-bhvr-x402.md): BHVR-x402 is a modern and lightweight stack for the open web and open payments