Technology history for 21c-learning.com
Stack size over time
From 23 detected technologies in Apr 2019 to 50 in Jun 2026 (peak 51).
Currently detected
- Cloudflare since Apr 2019
- Font Awesome since Apr 2019
- PHP since Apr 2019
- Pure CSS since Apr 2019
- Slick since Apr 2019
- Twitter since Apr 2019
- Google Analytics since Apr 2019
- Google Maps since Apr 2019
- jQuery since Apr 2019
- jQuery Migrate since Apr 2019
- MySQL since Apr 2019
- Twitter Emoji (Twemoji) since Apr 2019
- Typekit since Apr 2019
- WordPress since Apr 2019
- Yoast SEO since Apr 2019
- Modernizr since Apr 2019
- UIKit since Mar 2020
- Bootstrap since Jun 2020
- Elementor since Jun 2020
- Kinsta since Aug 2020
- core-js since Oct 2021
- Select2 since Oct 2021
- Twitter Ads since Oct 2021
- Campaign Monitor since Oct 2021
- Isotope since Oct 2021
- Unpkg since Oct 2021
- Snowplow Analytics since Oct 2021
- cdnjs since Nov 2021
- Formidable Form since May 2022
- Google Hosted Libraries since May 2022
- ProfilePress since May 2022
- Popup Maker since Jun 2022
- Amazon Web Services since Aug 2022
- Sendgrid since Aug 2022
- Google Workspace since Aug 2022
- HTTP/3 since Sep 2022
- Open Graph since Sep 2022
- Contact Form 7 since Oct 2022
- Dropzone since Oct 2022
- RSS since Dec 2022
- Zoho Mail since Sep 2023
- Zoho since Sep 2023
- Amazon CloudFront since Dec 2023
- Microsoft ASP.NET since Dec 2023
- Microsoft Visual Studio since Dec 2023
- HSTS since May 2024
- lit-element since Aug 2024
- lit-html since Aug 2024
- Glyphicons since Oct 2024
- Cloudflare Bot Management since Mar 2025
Previously used
- Google Font API Apr 2019 to Aug 2025 · 6 yrs
- TablePress Oct 2022 to Nov 2024 · 2 yrs
- Draftpress HFCM Mar 2023 to Jun 2023 · 3 mo
- Facebook Pixel Oct 2021 to Jun 2023 · 1 yr
- Intercom Apr 2019 to Jun 2023 · 4 yrs
- Cloudflare Network Error Logging May 2022 to Oct 2022 · 5 mo
- Jetpack May 2022 to Sep 2022 · 4 mo
- Stripe Aug 2022 to Aug 2022 · 1 mo
- Facebook Apr 2019 to Jan 2022 · 2 yrs
- reCAPTCHA Apr 2019 to Dec 2021 · 2 yrs
- Wheelio Oct 2021 to Oct 2021 · 1 mo
- Lodash Mar 2021 to Apr 2021 · 1 mo
- Nginx Aug 2020 to Apr 2021 · 8 mo
- Disqus Apr 2019 to Jan 2021 · 1 yr
- Backbone.js Apr 2019 to Jun 2019 · 2 mo
- Underscore.js Apr 2019 to Jun 2019 · 2 mo
Timeline
2025 1 added · 1 dropped · 1 switched
- switched Google Font API Twitter Emoji (Twemoji) Dec 2025 · Font scripts
- added Cloudflare Bot Management Mar 2025 · Security
- dropped TablePress Jan 2025 · WordPress plugins
2024 2 added · 1 dropped
- added Glyphicons Oct 2024 · Font scripts
- dropped Twitter Emoji (Twemoji) Sep 2024 · Font scripts
- added Twitter Emoji (Twemoji) May 2024 · Font scripts
2023 4 dropped · 1 switched
- dropped Draftpress HFCM Oct 2023 · WordPress plugins
- dropped Facebook Pixel Oct 2023 · Analytics
- dropped Intercom Oct 2023 · Live chat
- dropped Twitter Emoji (Twemoji) May 2023 · Font scripts
- switched Jetpack Draftpress HFCM Mar 2023 · WordPress plugins
2022 8 added · 5 dropped
- dropped Cloudflare Network Error Logging Dec 2022 · Issue trackers
- added RSS Dec 2022 · Miscellaneous
- dropped Stripe Dec 2022 · Payment processors
- added HTTP/3 Sep 2022 · Miscellaneous
- added Open Graph Sep 2022 · Miscellaneous
- added Amazon Web Services Aug 2022 · PaaS
- added Google Workspace Aug 2022 · Email
- added Sendgrid Aug 2022 · Email
- added Stripe Aug 2022 · Payment processors
- dropped Facebook Jun 2022 · Widgets
- added Popup Maker Jun 2022 · WordPress plugins
- dropped reCAPTCHA May 2022 · Security
- dropped Snowplow Analytics May 2022 · IaaS
2021 3 added · 6 dropped
- dropped Wheelio Dec 2021 · Widgets
- added cdnjs Nov 2021 · CDN
- dropped Lodash Nov 2021 · JavaScript libraries
- dropped Nginx Nov 2021 · Web servers
- dropped Disqus Mar 2021 · Comment systems
- dropped Intercom Mar 2021 · Analytics
- added Lodash Mar 2021 · JavaScript libraries
- dropped Twitter Emoji (Twemoji) Mar 2021 · Miscellaneous
- added jQuery Migrate Jan 2021 · JavaScript libraries
2020 3 added · 5 dropped
- dropped jQuery Migrate Oct 2020 · JavaScript libraries
- dropped Cloudflare Sep 2020 · CDN
- added Google Font API Sep 2020 · Font scripts
- added Kinsta Aug 2020 · PaaS
- added Nginx Aug 2020 · Reverse proxies
- dropped Backbone.js Apr 2020 · JavaScript Frameworks
- dropped Google Font API Apr 2020 · Font Scripts
- dropped Underscore.js Apr 2020 · JavaScript Libraries