Joost

PostCaster publishes WordPress posts to Bluesky and Mastodon when a post goes live. It supports both site-wide accounts and personal author accounts, with previews, test posts, and per-post overrides on the post edit screen.
This plugin is intended for editorial sites that want social posting to stay close to the WordPress publishing workflow.
Key capabilities:
<ul>
<li>Publish automatically when a post moves from unpublished to <code>publish</code></li>
<li>Use site-wide accounts in <code>PostCaster > Global socials</code></li>
<li>Let authors use their own accounts in <code>PostCaster > My socials</code></li>
<li>Preview the exact text before publishing</li>
<li>Override the text per article</li>
<li>Choose featured-image behavior per network</li>
<li>Re-publish manually from the post edit screen when needed</li>
</ul>
Quick start:
<ol>
<li>Activate the plugin.</li>
<li>Enable PostCaster in <code>PostCaster > Settings</code>.</li>
<li>Choose which post types may be published automatically.</li>
<li>Configure one or more site-wide accounts in <code>PostCaster > Global socials</code>.</li>
<li>Send a test post for each configured network.</li>
<li>Publish a test article and confirm the result on the target network.</li>
</ol>
Supported networks:
<ul>
<li>Bluesky</li>
<li>
Mastodon 
Permissions and publishing model:
</li>
<li>
Editors and administrators can publish through configured global accounts.
</li>
<li>Authors can publish through their own personal accounts when personal publishing is enabled for them.</li>
<li>A user who has access to both global and personal targets can choose which targets to use during manual publishing.</li>
<li>If Co-Authors Plus is active, linked co-authors are also recognized for personal publishing.</li>
</ul>
Templates and previews:
<ul>
<li>The default message template is based on post title and URL.</li>
<li>You can set a general template, network-specific templates, and post-specific overrides.</li>
<li>The post edit screen shows previews for the currently available publish targets.</li>
<li>If the final message is still too long for a network, PostCaster skips that target and stores an error on the article.</li>
</ul>
For template details and examples, see <code>docs/templates.md</code> in the plugin repository.
Troubleshooting highlights:
<ul>
<li>Always use the built-in test-post buttons after changing credentials.</li>
<li>If a network is enabled but not posting, first check credentials and article-level errors.</li>
<li>If encrypted credentials can no longer be read, re-save them in <code>Global socials</code> or <code>My socials</code>.</li>
<li>Publishing runs through Action Scheduler in the background; low-traffic sites still benefit from a real server cron job or scheduled task for reliable timing.</li>
</ul>
External services:
PostCaster connects to external social networks only after an administrator or user explicitly configures that network and saves the required credentials.
When configured, PostCaster may send:
<ul>
<li>text rendered from post fields and templates</li>
<li>featured image bytes and alt text</li>
<li>the configured account identifiers required by that network</li>
</ul>
Relevant service documentation and terms:
<ul>
<li>Bluesky developer docs: https://docs.bsky.app/</li>
<li>Bluesky terms: https://bsky.social/about/support/tos</li>
<li>Mastodon API docs: https://docs.joinmastodon.org/api/ 
Privacy note:</li>
</ul>
PostCaster does not send usage analytics or telemetry to the plugin author. Network requests are only made to the configured social networks for test posts and actual publishing.

PostCaster

Publishes WordPress posts with featured images to Bluesky and Mastodon.

Automattic

Matthias Pfefferle

Jeremy Herve

Brandon Kraft

Ryan C.

ATmosphere turns your WordPress site into a first-class citizen of the AT Protocol — the open network behind <a href="https://bsky.social/" rel="nofollow ugc">Bluesky</a>.
When you publish a post, ATmosphere automatically shares it on Bluesky and stores the full article on your AT Protocol account so any compatible app can read it. When people on Bluesky reply, like, or repost what you shared, those reactions show up as comments on your post. And approved comments your readers leave on WordPress are sent right back to Bluesky as replies under your original post — so the same conversation happens in both places without you having to copy anything by hand.
<h4>What you get</h4>
<ul>
<li>Your posts on Bluesky, automatically. Hit “Publish” on WordPress, and a moment later your post appears on Bluesky. Links, @-mentions, and #hashtags are detected for you.</li>
<li>Long posts done right. A long article becomes a short, readable Bluesky thread that links back to the full piece on your site. Edits are kept tidy so existing replies and reposts on Bluesky don’t get orphaned.</li>
<li>Use your own domain as your Bluesky handle. With one click, your handle becomes something like <code>@yourblog.com</code> instead of <code>@you.bsky.social</code>. ATmosphere does the technical bit; Bluesky verifies it.</li>
<li>Bluesky reactions become WordPress comments. Replies appear in your comments. Likes and reposts show up alongside them with their own counts so the engagement is visible to your readers.</li>
<li>WordPress comments become Bluesky replies. When a logged-in reader leaves an approved comment on a cross-posted article, it’s sent to Bluesky as a reply under the original post.</li>
<li>Catch up on older posts. A <code>wp atmosphere backfill</code> command can publish posts you wrote before installing the plugin.</li>
<li>Per-post control. You can opt individual posts out of cross-posting straight from the editor sidebar.</li>
<li>No middleman. ATmosphere talks directly to your Bluesky account using modern, secure sign-in. Nothing is routed through a third-party service, and your tokens never leave your WordPress site.</li>
<li>Translation-ready. Help translate ATmosphere into your language.</li>
</ul>
<h4>How it works</h4>
<ol>
<li>Install ATmosphere and activate it.</li>
<li>Go to Settings → ATmosphere and click “Connect” — sign in to Bluesky in the normal Bluesky window, then come back to WordPress.</li>
<li>Fill in a name, description, and icon for your “publication” — this is how your site is represented on the AT Protocol.</li>
<li>Publish a post.</li>
<li>Open Bluesky — your post is there. People can reply, like, repost, and follow as they normally would.</li>
<li>Replies, likes, and reposts will start appearing as comments on your WordPress post. Comments you approve on WordPress will appear as replies on Bluesky.</li>
</ol>
Note: Cross-posting only kicks in for posts you publish after connecting. To bring older posts across, run <code>wp atmosphere backfill</code> from WP-CLI.

ATmosphere


At this point (v 1.1.1) it is rather basic, but it does what it promises.


Does what it says on the tin.

Share your WordPress posts on Bluesky and the wider AT Protocol network — and let conversations there come back as comments on your site.

PostCaster vs ATmosphere