WebSub (FKA. PubSubHubbub) vs Subsync – RSS Sync for Substack

This plugin implements the WebSub protocol (formerly known as PubSubHubbub) for WordPress. It enables real-time notifications when your blog is updated and provides a subscriber API for other plugins to consume WebSub-enabled feeds. Publisher Features When you publish or update a post, this plugin automatically notifies WebSub hubs, which then distribute the update to all subscribers in real-time. Sends realtime notifications when you update your blog Supports multi-user installations (WordPress MU) Supports multiple hubs Supports all feed formats used by WordPress (Atom, RSS2, RDF) Adds and declarations to feeds and HTML Subscriber Features The plugin provides a subscriber API that allows other plugins (like feed readers) to subscribe to WebSub-enabled feeds using WordPress hooks. REST API callback endpoint for subscription verification and content delivery Hub discovery from topic URLs (HTTP Link headers and feed content) HMAC signature verification (SHA1, SHA256, SHA384, SHA512) Full lifecycle hooks for integration with other plugins Supported Specifications WebSub W3C Recommendation PubSubHubbub 0.4 Default Hubs By default this plugin will ping the following hubs: Demo hub on Google App Engine SuperFeedr WebSubHub Please contact us if you operate a hub that you would like to be included as a default option.

Bring your Substack to your WordPress site. Subsync automatically imports your Substack posts into WordPress, making them searchable, discoverable, and part of your website. Perfect for Substack writers who want to maintain a presence on their own domain. Why Subsync? Own Your Content Keep a backup of your posts on your WordPress site. If you ever decide to move platforms, you’ll have all your content ready to go. Improve Discoverability Make your posts searchable on Google and accessible to readers who prefer your website over email subscriptions. Grow Your Audience Give readers multiple ways to find and engage with your content. Your website visitors can browse your entire archive without needing to subscribe. Set It and Forget It Once configured, Subsync runs automatically. New posts appear on your site within 24 hours of publication. Key Features Setup Wizard — Get started in under 2 minutes with our guided setup process Automatic Syncing — Daily or weekly sync keeps your WordPress site updated automatically Featured Images — Automatically imports and sets featured images from your posts Custom Post Type — Posts appear in their own section, separate from your regular blog Flexible Display — Use shortcodes or Gutenberg blocks to display posts anywhere on your site Smart Content — Shows post excerpts with “Read More” buttons that link back to your Substack Responsive Design — Mobile-friendly display works beautifully on all devices Missing Post Handling — Choose what happens when you delete a post (keep or draft) Clean Uninstall — Optionally removes all data when you deactivate Translation Ready — Fully internationalized and ready for translation How It Works Install and activate the plugin Enter your RSS feed URL (e.g., yourname.substack.com/feed) Run the initial sync to import your existing posts Add the [sstack_posts] shortcode or Gutenberg block to any page Your posts now display on your WordPress site! New posts are automatically synced daily (or weekly, your choice). Manual sync is always available if you want to update immediately after publishing. Display Options Shortcode Usage: [sstack_posts] — Show all posts (default 10, recommended) [sstack_posts count=”5″] — Show 5 most recent posts [sstack_posts orderby=”title” order=”ASC”] — Sort alphabetically You can also use [subsync_posts] or [substack_posts] (backwards compatibility). Gutenberg Block: Use the “Subsync Posts” block in the editor with live preview and visual controls for number of posts, sorting, and ordering. Perfect For Substack writers who want to maintain a website presence Newsletter publishers on any platform with RSS Content creators building a multi-platform audience Authors keeping a backup of their content Publications growing their SEO and discoverability Pro Version Features Upgrade to Subsync Pro for advanced features: Multi-Column Layouts — Display posts in 2 or 3 column grids Author Info Box — Display your bio, avatar, and subscribe button alongside posts Divi Module — Native integration with Divi Builder for visual page building Priority Support — Email support with faster response times Learn more about Subsync Pro → Privacy & Data Subsync does not collect, store, or transmit any personal data from your site visitors. The plugin only reads publicly available RSS feed data. No tracking, no analytics. External Services This plugin connects to external services to function properly: Substack RSS Feeds and Images * What: The plugin fetches your RSS feed from Substack and downloads featured images from Substack’s CDN * When: During sync operations (manual or automatic based on your schedule) * Data sent: Standard HTTP requests to retrieve publicly available RSS feed data and image files * Purpose: To display your Substack posts and their associated images on your WordPress site * Terms: Substack Terms of Service * Privacy: Substack Privacy Policy The plugin does not send any personal or sensitive data to external services. All data retrieved is publicly available content from your Substack publication.