This list is out of date and no longer maintained.
List of plugins
I’ll be curating this list of plugins which have been tested by the community as working with ClassicPress v1.
Please add your list of tested plugins below and I’ll add them all to this first post to serve as the master list:
- __debug by fwolf (CP v1) #
- 404page - your smart custom 404 error page by Peter Raschendorfer (CP v1)
- AccessPress Social Pro (CP v1)
- Accordeon Menu CK by Cédric KEIFLIN (CP v1) #
- ACF Duplicate Repeater (CP v1)
- ACF Field For Contact Form 7 (CP v1)
- ACF Field for OpenStreetMap (CP v1)
- ACF to REST API (this one: GitHub - airesvsg/acf-to-rest-api: Exposes Advanced Custom Fields Endpoints in the WordPress REST API) (CP v1)
- ACF: Better Search (CP v1)
- Add Category to Pages (CP v1)
- Add Open Graph Tags by azurecurve (CP v1) #
- Add Twitter Cards by azurecurve (CP v1) #
- AddToAny Share Buttons (CP v1)
- Admin Color Schemer (CP v1)
- Admin Color Schemes (CP v1)
- Admin Columns (CP v1)
- Admin Menu Editor Pro (CP v1)
- Admin Word Count Column (CP v1)
- Adminimize (CP v1)
- Ads inserter Pro (CP v1)
- Advanced Ads (CP v1)
- Advanced CF 7 DB (CP v1)
- Advanced Custom Fields (CP v1)
- Advanced Custom Fields Pro) (CP v1)
- Advanced Custom Fields: Star Rating Field (CP v1)
- Advanced Database Cleaner (CP v1)
- Advanced Forms (CP v1)
- Advanced Post Types Order (CP v1)
- Advanced Recent Posts (CP v1)
- Advanced Sidebar Menu (CP v1)
- Age Gate (CP v1)
- Akismet (CP v1)
- Album and Image Gallery Plus Lightbox Pro (CP v1)
- All In One SEO Pack (CP v1)
- All In One WP Security (CP v1)
- All-in-One Event Calendar by Time.ly (CP v1)
- All-in-One WP Migration (CP v1)
- All-in-One WP Migration (CP v1) by Servmask (CP v1) #
- All-in-One WP Migration Unlimited Extension (CP v1)
- All-in-One WP Migration Unlimited Extension (CP v1) by Servmask (CP v1) #
- AME Branding Add-on (CP v1)
- AMP (CP v1)
- Anti-spam (CP v1)
- Antispam Bee (CP v1)
- ARI Adminer (CP v1)
- Asgaros Forum (CP v1)
- Aspexi Facebook Like Box Slider (CP v1)
- Autoptimize (CP v1)
- Avatars by azurecurve (CP v1) #
- azurecurve BBCode by azurecurve (CP v1) #
- azurecurve Breadcrumbs by azurecurve (CP v1) #
- azurecurve Comment Validator by azurecurve (CP v1) #
- azurecurve Conditional Links by azurecurve (CP v1) #
- azurecurve Display After Post Content by azurecurve (CP v1) #
- azurecurve Filtered Categories by azurecurve (CP v1) #
- azurecurve Flags by azurecurve (CP v1) #
- azurecurve Floating Featured Image by azurecurve (CP v1) #
- azurecurve Get Plugin Info by azurecurve (CP v1) #
- azurecurve Icons by azurecurve (CP v1) #
- azurecurve Insult Generator by azurecurve (CP v1) #
- azurecurve Mobile Detection by azurecurve (CP v1) #
- azurecurve Multisite Favicon by azurecurve (CP v1) #
- azurecurve Page Index by azurecurve (CP v1) #
- azurecurve Posts Archive by azurecurve (CP v1) #
- azurecurve RSS Feed by azurecurve (CP v1) #
- azurecurve RSS Suffix by azurecurve (CP v1) #
- azurecurve Series Index by azurecurve (CP v1) #
- azurecurve Shortcodes In Comments by azurecurve (CP v1) #
- azurecurve Shortcodes In Widgets by azurecurve (CP v1) #
- azurecurve Tag Cloud by azurecurve (CP v1) #
- azurecurve Taxonomy Index by azurecurve (CP v1) #
- azurecurve Theme Switcher by azurecurve (CP v1) #
- azurecurve Timelines by azurecurve (CP v1) #
- azurecurve Toggle Show/Hide by azurecurve (CP v1) #
- BackupBuddy (CP v1)
- BAW Login/Logout menu (CP v1)
- BBCode by azurecurve (CP v1) #
- bbPress (CP v1)
- bbPress New UI (CP v1)
- Beaver Builder Plugin (CP v1) #
- Beaver Themer (CP v1)
- Better Notifications for WordPress (CP v1)
- Bogo (CP v1)
- Breadcrumbs by azurecurve (CP v1) #
- Broken Link Checker (CP v1)
Bubble SEO (CP v1)++- BulkPress (CP v1)
- Call-out Boxes by azurecurve (CP v1) #
- Captcha (CP v1)
- Carbon Copy by Code Potent (CP v1) #
- Carousel CK (CP v1) #
- Category and Taxonomy Image by Aftab Husain (CP v1)
- Category Order and Taxonomy Terms Order (CP v1)
- Category Posts Widget (CP v1)
- CF7 Invisible reCAPTCHA (CP v1)
- Chamber Dashboard Business Directory (CP v1)
- Child Theme Configurator (CP v1)
- Child Theme Configurator Pro (CP v1)
- Child Theme Generator (CP v1)
- Cimy User Manager (CP v1)
- Classic Elementor by James Nylen (CP v1) #
- Classic Smilies (CP v1)
- Clean Login (CP v1) #
- CleanTalk SpamFireWall (aka Anti-Spam by CleanTalk) (CP v1)
- CloudFlare Flexible SSL (CP v1)
- Code by azurecurve (CP v1) #
- Code Prettify (CP v1)
- Code Snippets (CP v1)
- Code Snippets (CP v1)
- Column Shortcodes (CP v1)
- Coming Soon Page & Maintenance Mode by SeedProd (CP v1)
- Comment Approved (CP v1)
- Comment Validator by azurecurve (CP v1) #
- Companion Revision Manager (CP v1)
- Conditional Links by azurecurve (CP v1) #
Contact Form 7 (CP v1)**- Contact Form 7 CFD (CP v1)
- Contact Form 7 Conditional Fields (CP v1)
- Contact Form 7 Controls (CP v1)
Contact Form 7 Datepicker by Aurel Canciu (CP v1)++- Contact Form 7 Editor Button (CP v1)
- Contact Form 7 Honeypot (CP v1)
- Contact Form 7 Multi-Step Forms (CP v1)
- Contact Form 7 Redirection (CP v1)
- Content Views (CP v1)
- Content Views Pro (CP v1)
- Cookie Bar (CP v1)
- Cookie Notice (CP v1)
- Cookies CK (CP v1) #
- Count Per Day (CP v1)
- CP Admin Colors by klein (CP v1) #
- Crisp (CP v1)
- Cryout Serious Theme Settings (* companion to Nirvana and other themes) (CP v1)
- Currently Reading (CP v1)
- Custom Content Shortcode (CP v1)
- Custom Dashboard Widgets (CP v1)
- Custom Login by Austin Passy
- Custom Meta Widget (CP v1)
- Custom Module (CP v1)
- Custom Related Posts (CP v1)
- Custom Skins Contact Form 7 (CP v1)
- DC CODE User Avatar (CP v1)
- Disable Embeds (CP v1) #
- Disable Feeds (CP v1) #
- Disable Google Fonts (CP v1) #
- Disable Gutenberg (CP v1)
- Disable XML-RPC (CP v1) #
- Display After Post Content by azurecurve (CP v1) #
- Display Posts (CP v1)
Disqus for WordPress (CP v1)**- Divi 100 Login Page (CP v1)
- Divi Booster (CP v1)
Divi Builder (CP v1)X- Dobby (CP v1)
- Dologin Security (CP v1)
- Drop Cap Shortcode (CP v1)
- Duplicate Post (CP v1) [now Yoast Duplicate Post]
- Duplicate Posts (CP v1)
- Duplicate Widgets (CP v1)
- Duplicator (CP v1)
- Easy FAQ with Expanding Text (CP v1)
- Easy Pricing Tables by Fatcat Apps (CP v1)
- Easy Registration Forms by EasyRegistrationForms (CP v1)
- Easy WP SMTP (CP v1)
- Edit Author Slug (CP v1)
- Elastic Email Sender (CP v1)
Elementor (CP v1)**Elementor Pro (CP v1)**- Email Address encoder (CP v1)
- Email Log (CP v1)
- Email Subscribers & Newsletters (CP v1)
Email Subscribers & Newsletters (CP v1)(dupe)- Email Users (CP v1)
Email Users (CP v1)(dupe)- Enhanced Media Library (CP v1)
- Enhanced Media Library Pro (CP v1)
- Erident Custom Login and Dashboard (CP v1)
- Essential Addons for Elementor - Pro (CP v1)
- Estimated Read Time by Code Potent (CP v1) #
- EU Cookie Law (CP v1)
Events Manager (CP v1)**- Everest Gallery (CP v1)
- Exclude Pages From Menu (CP v1)
- Extended Widget Options (CP v1) #
- Fast Velocity Minify (CP v1) #
- Featured Image by URL (CP v1)
- Filtered Categories by azurecurve (CP v1) #
- Flags by azurecurve (CP v1) #
- Flamingo by Takayuki Miyoshi (CP v1)
- Floating Featured Image by azurecurve (CP v1) #
- FooBox Image Lightbox (CP v1)
- FoooGallery (CP v1)
- Force Login by Kevin Vess
- Forget About Shortcode Buttons (CP v1)
Format Media Titles (free version) (CP v1)**- Formidable API (CP v1)
- Formidable Forms (CP v1)
- Formidable Forms Pro (CP v1)
- Formidable Registration (CP v1)
- Freesoul Deactivate Plugins (CP v1)
- Frontend Dashboard (CP v1)
- Fusion : Plugin - Fusion Page Builder, including all its extensions (CP v1)
- GD bbPress Tools (CP v1)
- GDPR Consent (CP v1)
- GDPR Cookie Consent (CP v1)
- Get GitHub File by azurecurve (CP v1) #
- Github Embed (CP v1)
- GNU Terry Pratchett (CP v1)
- Google Analytics Dashboard for WP (CP v1)
- Google Language Translator (CP v1)
- Google XML Sitemaps (CP v1)
- GP Premium (CP v1)
- Gravity Forms (CP v1)
- Gravity Forms Stripe Add-On (CP v1)
- Gravity Forms Zapier Add-on (CP v1)
- Gravity PDF by Gravity PDF
- hashtagger (CP v1)
Hello Dolly by Matt Mullenweg (CP v1)- Hide SEO Bloat (CP v1) #
- Hyper Cache (CP v1)
- Icegram-Popups, Optins, CTAs & lot more… (CP v1)
- Icons by azurecurve (CP v1) #
- Image Effect CK (CP v1) #
- Image Rotator Widget (CP v1)
- Images by azurecurve (CP v1) #
- Imsanity (CP v1)
- InfiniteWP (CP v1)
- Instant Images (CP v1)
Instant Images (CP v1)(dupe)- Insult Generator by azurecurve (CP v1) #
- Intagrate Lite (CP v1)
- Intuitive Custom Post Order (CP v1)
- iQ Block Country (CP v1)
- iReview Theme (CP v1)
iThemes Security (CP v1)**iThemes Security Pro (CP v1)**- Ivory Search by Ivory Search (CP v1)
- Jetpack (CP v1)
- JReviews for WordPress plugin (CP v1)
- JSON Feed for ClassicPress (CP v1)
- Justified Image Grid (Premium) (CP v1)
- Ko-Fi Button (CP v1)
- KVTinyMCE Editor Add Fonts (CP v1)
- Lazy Loader (CP v1)
- Leaflet Maps Marker (CP v1)
- Lightbox with PhotoSwipe (CP v1)
- Lightweight Grid Columns (CP v1)
- Lightweight Subscribe To Comments (CP v1)
- Limit Login Attempts (CP v1)
- Link View (CP v1)
- List all posts by Author, nested Categories and Titles (CP v1)
- List category posts (CP v1)
- List MixCloud (CP v1)
- LiteSpeed Cache Plugin (CP v1) #
- Loco Translate (CP v1)
- Login reCAPTCHA (CP v1)
- Loginizer (CP v1)
- Loop Injection by azurecurve (CP v1) #
- Maintenance Mode (CP v1) #
- MainWP (CP v1)
- MainWP Child (CP v1)
- Mammoth .docx converter (CP v1)
- Manage XML-RPC (CP v1)
- ManageWP - Worker (CP v1)
- MapPress Maps for WordPress (CP v1)
- Maps Marker Pro (CP v1) #
- Markdown by azurecurve (CP v1) #
- Master Slider (CP v1)
- Mastodon Embed Improved by fwolf (CP v1) #
- MB Custom Post Type (CP v1)
- Mechanic Visitor Counter (CP v1)
- Media Cloud (CP v1)
- Mediabox CK (CP v1) #
- Members (CP v1)
- Meta Box (CP v1)
- Meta Box - Beaver Themer Integrator (CP v1)
- Meta Box AIO (CP v1)
- Meta Slider and Carousel with Lightbox Pro (CP v1)
- MetaSlider (CP v1)
- miniOrange 2 Factor Authentication (CP v1)
- Mobile Detection by azurecurve (CP v1) #
- Mobile Map Widget (CP v1) #
- Mobile Menu CK (CP v1) #
- Multisite Favicon by azurecurve (CP v1) #
- My Calendar (CP v1)
- My Private Site (CP v1)
- Nested Pages (CP v1)
Nested Pages (CP v1)(dupe)- Netgsm (CP v1)
- NextGen Gallery (CP v1)
- NextGEN Plus (CP v1)
- NextGen Pro (CP v1)
- No Right Click Images Plugin (CP v1)
- NoPIN (CP v1)
Ocean Custom Sidebar (CP v1)**Ocean Extra (CP v1)**- Ocean Hooks (CP v1)
- Ocean Pro Demos (CP v1)
- Ocean Social Sharing (CP v1)
- Ocean Sticky Header (CP v1)
- Ocean White Label (CP v1)
- Ocean Woo Popup (CP v1)
- Online Payments with PayPal and Stripe - By vCita (CP v1)
- Optimize Database after Deleting Revisions (CP v1)
- Optimus (CP v1)
- Organize Series (CP v1)
- Page Builder by Site Origin (CP v1)
- Page Index by azurecurve (CP v1) #
- Page Links To (CP v1)
- PayPal for Contact Form 7 (CP v1)
- Peter’s Login Redirect by Peter Keung (CP v1)
- Peter’s Login Redirect (CP v1)
- Photoswipe Masonry (CP v1)
- PHP Compatibility Checker (CP v1)
- Pinyin Slugs (CP v1) #
- Plugin Inspector (CP v1)
- PolyLang (CP v1)
- Popup Builder by Sygnoos (CP v1)
- Popup Maker (CP v1)
- Post Archive by azurecurve (CP v1) #
- Post Grid (CP v1)
- Post SMTP (CP v1)
- Post Tags and Categories for Pages (CP v1)
- Post Type Switcher (CP v1)
- Post Types Order (CP v1)
- Postie (CP v1)
- Press This (CP v1)
- Print My Blog by Michael Nelson (CP v1)
- qTranslate slug (CP v1)
- qTranslate-XT (CP v1)
- Query Monitor (CP v1)
- Quick Bulk Post & Page Creator (CP v1)
- Quick Toolbar (CP v1)
- Quiz and Survey Master (CP v1)
- Rainmaker - The Best Readymade WP Forms Plugin (CP v1)
- Random User IDs (CP v1)
Rank Math SEO (CP v1)**- RCD-Right Click Disabler for WordPress (CP v1)
- Really Simple SSL (CP v1)
- Recent Posts Widget Extended by Satrya (CP v1)
- Redux Framework (CP v1)
- Regenerate Thumbnails (CP v1)
- Relevanssi (+ Relevanssi Premium) (CP v1)
- Remove WPML Menu Sync (CP v1) #
- Responsive Content (CP v1) #
- Responsive Lightbox & Gallery (CP v1)
- Responsive Menu (CP v1)
- Responsive WordPress Slider - Soliloquy Lite (CP v1)
- Restrict Widgets (CP v1)
- Reusable Content & Text Blocks by Loomisoft (CP v1)
- Rolo Slider (CP v1)
- RSS Feed by azurecurve (CP v1) #
- RSS Suffix by azurecurve (CP v1) #
- Safe SVG (CP v1)
- Schedule Posts Calendar (CP v1)
- Scriptless Social Sharing (CP v1)
- Scroll To CK (CP v1) #
- Secondary Title by Kolja Nolte (CP v1)
- Self-Hosted Google Fonts (CP v1)
- Send PDF for Contact Form 7 (CP v1)
- SEOPress (CP v1)
- SEOPress PRO (CP v1)
- Series Index by azurecurve (CP v1) #
- Server Info (CP v1)
- Server IP & Memory Usage Display (CP v1)
- Shield Security v7 (CP v1) #
- Shortcodes Finder (CP v1)
- Shortcodes in Comments by azurecurve (CP v1) #
- Shortcodes in Widgets by azurecurve (CP v1) #
- Shortcodes Ultimate (CP v1)
- Shortcodes Ultimate: Extra Shortcodes (CP v1)
- Shortcodes Ultimate: Shortcode Creator (CP v1)
- Show IDs (CP v1)
- Sidebar Login by Mike Jolley (CP v1)
- Sidebar Login by azurecurve (CP v1) #
- Simple Breadcrumbs (CP v1)
- Simple Content Templates (CP v1)
- Simple CSS (CP v1)
- Simple History (CP v1)
- Simple Local Avatars (CP v1)
Simple Sitemap (CP v1)**- Simple Sitemap Pro (CP v1)
- Simple User Avatar (CP v1)
- Site Offline (CP v1)
- Slack Notifications (CP v1)
- Slideshow CK (CP v1) #
- Slimstat Analytics (CP v1)
- Smart Slider 3 Pro (CP v1)
Smush (CP v1)**- Smush Pro by WPMU (CP v1)
- SmushIt by WPMU (CP v1)
- Social Media and Share Icons (Ultimate Social Media) (CP v1)
- Spam Destroyer (CP v1)
- Spoken Word (CP v1)
- Stripe Payments by Tips and Tricks HQ, wptipsntricks (CP v1)
- Sublanguage (CP v1)
- Subscribe to “Double-Opt-In” Comments (CP v1)
- Sucuri Security (CP v1)
- Swift Performance (CP v1)
- Switch to ClassicPress (CP v1)
- Tag Cloud by azurecurve (CP v1) #
- Tailor (CP v1)
- Taxonomy Index by azurecurve (CP v1) #
- Template Creator CK (CP v1) #
- The SEO Framework (CP v1)
Theme My Login (CP v1)**- Theme Switcher by azurecurve (CP v1) #
- Thin Out Revisions (CP v1)
- Thrive Architect (CP v1)
- Thrive Leads (CP v1)
- Timed Content (CP v1)
- Timelines by azurecurve (CP v1) #
- Timetable and Event Schedule (CP v1)
- TinyMCE Advanced (CP v1)
- To Top (CP v1)
- To Twitter by azurecurve (CP v1) #
- Toggle Show/Hide by azurecurve (CP v1) #
- Tooltip CK (CP v1) #
- Top 10 (CP v1)
- TranslatePress - Extra Languages Add-on (CP v1)
- TranslatePress - Multilingual (CP v1)
- UI Image Optimizer by fwolf (CP v1) #
- UI Leaflet Integration by fwolf (CP v1) #
- UI SSL Enforcer by fwolf (CP v1) #
- Ultimate Category Exclude (CP v1)
- Ultimate Dashboard (CP v1)
- Ultimate Member (CP v1)
- Ultimate Tag Cloud Widget (CP v1)
- Update Manager by Code Potent (CP v1) #
- UpdraftPlus (CP v1)
- URL Shortener by azurecurve (CP v1) #
- User Role Editor Pro (CP v1)
- User Switching (CP v1)
- Username Protection by Code Potent (CP v1) #
- Weather Atlas Widget (CP v1)
- Which Template File (CP v1)
- Widget CSS Classes (CP v1)
- Widget Options (CP v1) #
- Widgetize pages Light (CP v1)
WordFence (CP v1)X- Wordfence Security (CP v1)
- Wordpress Auto Spinner (CP v1)
- WordPress Automatic Plugin (CP v1)
- WordPress Carousel (CP v1)
- WordPress Editorial Calendar (CP v1)
- WordPress eStore by Tips and Tricks HQ, wptipsntricks (CP v1)
- WordPress Importer (CP v1)
- WordPress Scheduled Time by Willen.net (CP v1)
- WordPress Toolbar Editor (CP v1)
- WP Admin Color Schemes (CP v1)
- WP Ajaxify Comments (CP v1)
- WP Broken Link Status Checker (CP v1)
- WP Edit (CP v1)
- WP ERP (free version) (CP v1)
- WP Fastest Cache (CP v1)
- WP Frontend Admin (CP v1)
- WP Full Stripe Free (CP v1)
- WP Like button (CP v1)
- WP Link Preview (CP v1)
- WP Mail SMTP Plugin by Mail Bank (CP v1)
- WP Maintenance Mode (CP v1)
- WP Media Category Management (CP v1)
- WP Nav Plus (CP v1)
- WP Optize (CP v1)
- WP PayPal (CP v1)
- WP Photo Album Plus (CP v1)
- WP Power Stats (CP v1)
- WP Real Media Library (Premium) (CP v1)
- WP Responsive Menu (CP v1)
- WP Rest Filter (CP v1)
- WP Rocket (CP v1)
- WP Rollback (CP v1)
- WP Simple Paypal Shopping cart (CP v1)
- WP Statistics (CP v1)
- WP Stealth Site (CP v1)
- WP Super Cache (CP v1)
- WP Ultimo (CP v1)
- WP User Frontend (CP v1)
- WP User Frontend Pro - business (CP v1)
- WPBakery Visual Composer (CP v1)
- WPBruiser (CP v1)
- WPBruiser - CountryBlocking (CP v1)
- WPBruiser - GravityForms (CP v1)
- WP-DBManager (CP v1)
- wpDiscuz (CP v1)
- wpForo (CP v1)
- WP-PageNavi (CP v1)
- WP-SCSS (CP v1)
WP-Spamshield (CP v1)++- WP-Sweep (CP v1)
- WYSIWYG Advanced by Code Potent (CP v1) #
- Years Since by Code Potent (CP v1) #
- YellowPencil Pro (CP v1)
- Yet Another Related Posts Plugin (CP v1)
Yoast SEO Premium (CP v1)**- YouTube (CP v1)
- ZigConnect (CP v1) #
- ZigCookie (CP v1) #
- ZigDashNote (CP v1) #
- ZigHtaccess (CP v1) #
- ZigPluginSafe (CP v1) #
- ZigTrap (CP v1) #
- ZigTweets (CP v1) #
- ZigWidgetClass (CP v1) #
Supported versions are in parentheses.
Key
# developer says they will support ClassicPress
X developer has confirmed they will not support ClassicPress
** requires WP 5+
++ plugin withdrawn from WP repo
Thanks to all who have contributed their lists of tested plugins already. 
).