Technology history for 21st.com
Stack size over time
From 3 detected technologies in Apr 2018 to 25 in Jun 2026 (peak 34).
Currently detected
- Google Font API since Apr 2018
- Incapsula since Apr 2018
- jQuery since Apr 2018
- Google Plus since Jun 2018
- Google Tag Manager since Jun 2018
- Google Analytics since Jun 2018
- Java since Jun 2018
- Java Servlet since Jun 2018
- Facebook since Apr 2020
- Apache HTTP Server since Apr 2020
- Imperva since Aug 2020
- Bootstrap since Dec 2020
- core-js since Nov 2021
- Segment since Dec 2021
- Qualtrics since Jan 2022
- Salesforce since Jan 2022
- VWO since Jun 2022
- DocuSign since Aug 2022
- HSTS since Sep 2022
- Salesforce Desk since Oct 2022
- FullStory since Jun 2023
- Dynatrace since Aug 2023
- Amazon ALB since Jan 2025
- Amazon Web Services since Jan 2025
- Vue.js since Dec 2025
Previously used
- Akamai Jan 2022 to Oct 2025 · 3 yrs
- Akamai Web Application Protector Dec 2022 to Oct 2025 · 2 yrs
- Amazon Advertising May 2024 to Jul 2024 · 2 mo
- Amazon Webstore May 2024 to Jul 2024 · 2 mo
- Facebook Pixel Jun 2021 to Jun 2024 · 3 yrs
- Akamai Bot Manager Jan 2022 to Apr 2024 · 2 yrs
- Priority Hints Aug 2022 to Feb 2024 · 1 yr
- Aura Oct 2022 to Oct 2023 · 1 yr
- Salesforce Service Cloud Jan 2022 to Oct 2023 · 1 yr
- ClickTale Jan 2022 to Jun 2023 · 1 yr
- AppDynamics Sep 2020 to May 2023 · 2 yrs
- Contentsquare Jul 2022 to Apr 2023 · 9 mo
- Simpli.fi Nov 2021 to Jan 2023 · 1 yr
- theTradeDesk Apr 2022 to Jan 2023 · 9 mo
- Adobe Audience Manager Apr 2022 to Dec 2022 · 8 mo
- Google Ads Conversion Tracking Jul 2021 to Oct 2022 · 1 yr
- SiteSpect May 2021 to Oct 2022 · 1 yr
- Heroku Aug 2022 to Aug 2022 · 1 mo
- ContentSquare Jul 2021 to Jun 2022 · 11 mo
- Ensighten Dec 2020 to Feb 2021 · 2 mo
Timeline
2025 5 added · 2 dropped
- dropped Akamai Dec 2025 · CDN
- dropped Akamai Web Application Protector Dec 2025 · Security
- added Vue.js Dec 2025 · JavaScript frameworks
- added Akamai Oct 2025 · CDN
- added Akamai Web Application Protector Oct 2025 · Security
- added Amazon ALB Jan 2025 · Load balancers
- added Amazon Web Services Jan 2025 · PaaS
2024 4 added · 6 dropped
- dropped Amazon Advertising Sep 2024 · Advertising
- dropped Amazon Webstore Sep 2024 · Ecommerce
- dropped Facebook Pixel Aug 2024 · Analytics
- dropped Akamai Jun 2024 · CDN
- dropped Akamai Bot Manager Jun 2024 · Security
- added Amazon Advertising May 2024 · Advertising
- added Amazon Webstore May 2024 · Ecommerce
- added Facebook Pixel May 2024 · Analytics
- dropped Priority Hints Apr 2024 · Performance
- added Priority Hints Feb 2024 · Performance
2023 5 added · 12 dropped
- dropped Aura Dec 2023 · UI frameworks
- dropped Salesforce Service Cloud Dec 2023 · CRM
- dropped ClickTale Aug 2023 · Analytics
- added Dynatrace Aug 2023 · Analytics
- dropped Akamai Web Application Protector Jul 2023 · Security
- dropped AppDynamics Jul 2023 · Analytics
- dropped Contentsquare Jun 2023 · Analytics
- added FullStory Jun 2023 · Analytics
- added Akamai Web Application Protector May 2023 · Security
- dropped Priority Hints May 2023 · Performance
- dropped Facebook Pixel Mar 2023 · Analytics
- added Priority Hints Mar 2023 · Performance
- dropped Simpli.fi Mar 2023 · Advertising
- dropped theTradeDesk Mar 2023 · Advertising
- dropped Adobe Audience Manager Feb 2023 · Segmentation
- dropped Akamai Web Application Protector Feb 2023 · Security
- added VWO Jan 2023 · Analytics
2022 34 added · 10 dropped
- added Akamai Web Application Protector Dec 2022 · Security
- dropped Google Ads Conversion Tracking Dec 2022 · Analytics
- dropped Priority Hints Dec 2022 · Performance
- dropped SiteSpect Dec 2022 · A/B Testing
- dropped VWO Dec 2022 · Analytics
- added Aura Oct 2022 · UI frameworks
- dropped Heroku Oct 2022 · PaaS
- added Salesforce Desk Oct 2022 · CRM
- added HSTS Sep 2022 · Security
- added Adobe Audience Manager Aug 2022 · Segmentation
- added Akamai Aug 2022 · CDN
- added Akamai Bot Manager Aug 2022 · Security
- added AppDynamics Aug 2022 · Analytics
- added Bootstrap Aug 2022 · UI frameworks
- added ClickTale Aug 2022 · Analytics
- added Contentsquare Aug 2022 · Analytics
- dropped ContentSquare Aug 2022 · Analytics
- added core-js Aug 2022 · JavaScript libraries
- added DocuSign Aug 2022 · Miscellaneous
- added Facebook Pixel Aug 2022 · Analytics
- added Google Ads Conversion Tracking Aug 2022 · Analytics
- added Heroku Aug 2022 · PaaS
- added Imperva Aug 2022 · Security
- added Priority Hints Aug 2022 · Performance
- added Qualtrics Aug 2022 · Surveys
- added Salesforce Aug 2022 · CRM
- added Salesforce Service Cloud Aug 2022 · CRM
- added Segment Aug 2022 · Customer data platform
- added Simpli.fi Aug 2022 · Advertising
- added SiteSpect Aug 2022 · A/B Testing
- added theTradeDesk Aug 2022 · Advertising
- added VWO Aug 2022 · Analytics
- added Contentsquare Jul 2022 · Analytics
- added VWO Jun 2022 · Analytics
- added Adobe Audience Manager Apr 2022 · Segmentation
- added core-js Apr 2022 · JavaScript libraries
- added Facebook Pixel Apr 2022 · Analytics
- added Google Ads Conversion Tracking Apr 2022 · Analytics
- added Simpli.fi Apr 2022 · Advertising
- added theTradeDesk Apr 2022 · Advertising
- dropped core-js Mar 2022 · JavaScript libraries
- dropped Facebook Pixel Mar 2022 · Analytics
- dropped Google Ads Conversion Tracking Mar 2022 · Analytics
- dropped Simpli.fi Mar 2022 · Advertising
2021 5 added · 2 dropped
- added Segment Dec 2021 · Customer data platform
- added ContentSquare Jul 2021 · User onboarding
- added Google Ads Conversion Tracking Jul 2021 · Analytics
- added Facebook Pixel Jun 2021 · Analytics
- added SiteSpect May 2021 · A/B Testing
- dropped Bootstrap Apr 2021 · UI frameworks
- dropped Ensighten Apr 2021 · Tag managers
2020 6 added
- added Bootstrap Dec 2020 · UI frameworks
- added Ensighten Dec 2020 · Tag managers
- added AppDynamics Sep 2020 · Analytics
- added Imperva Aug 2020 · Security
- added Apache HTTP Server Apr 2020 · Web Servers
- added Facebook Apr 2020 · Widgets
2019 8 added
- added Google Analytics Mar 2019 · Analytics
- added Google Font API Mar 2019 · Font Scripts
- added Google Plus Mar 2019 · Widgets
- added Google Tag Manager Mar 2019 · Tag Managers
- added Incapsula Mar 2019 · CDN
- added Java Mar 2019 · Programming Languages
- added Java Servlet Mar 2019 · Web Frameworks
- added jQuery Mar 2019 · JavaScript Libraries