







Quick diagnostics for PDS hosts, handles, relay connections, handles, DIDs, ...
Beyond the Statusphere: Part 1, Resolving the User's PDS - Hitchhiker's Guide to the Atmosphere
Learn why it's important to resolve the user's PDS and use that in your ATProto applications.
ATProto Architecture
Visual summary of the AT Protocol architecture: PDS, AppView, identity, records, lexicons.

Setting Up Your Own PDS Is Frighteningly Easy
A PDS, or Personal Data Server, is kind of the core thing behind atproto. The idea is that it's a server that stores all your atproto data and cryptographic keys. Most people just use Bluesky's PDS right now, but this is probably the most commonly self-hosted part of the ecosystem:

PDS.RIP - Ephemeral Sandbox PDS
Welcome to a public sandbox PDS for the AT Protocol network. Create an account, test the protocol, build cool stuff.

OpenPDS - AT Protocol PDS Directory
AT Protocol PDS servers with open registration. Data from atproto-scraping, enriched daily.
GrandPerspective — PDS edition
See where an atproto repository's bytes actually go, and act on what you find.
Heron - A gentle atproto client
PDS Viewer
Browse Your AT Protocol PDS Records Like a File Tree. OAuth-Powered, Read-Only, Client-Side.

Welcome to the new atproto.com - AT Protocol
We've updated just about everything about atproto.com to make it easier for developers to just build things.

Cosmik Testing
@cosmiktesting.bsky.social
An account for testing atproto integrations related to cosmik.network