Technology history for duolingo.cn
Stack size over time
From 2 detected technologies in Apr 2018 to 28 in Jun 2026 (peak 31).
Currently detected
- Google Analytics since Jun 2018
- React since Jun 2018
- Webpack since Jul 2018
- Google Tag Manager since Feb 2019
- Backbone.js since Apr 2020
- Underscore.js since Apr 2020
- Baidu Analytics (百度统计) since Dec 2020
- Envoy since May 2021
- OneTrust since May 2021
- Facebook Pixel since Jun 2021
- Howler.js since Jul 2021
- Amazon Web Services since Aug 2021
- Amazon ALB since Aug 2021
- core-js since Sep 2021
- PWA since Aug 2022
- Open Graph since Sep 2022
- Adjust since Oct 2022
- reCAPTCHA since Feb 2023
- Google Sign-in since Apr 2023
- Ahrefs since Jun 2023
- LottieFiles since Nov 2023
- Sentry since Nov 2023
- Microsoft Advertising since Dec 2023
- Microsoft Clarity since Dec 2023
- Lodash since Feb 2024
- Amazon S3 since Sep 2024
- React Router since Nov 2024
- HSTS since Apr 2025
Previously used
- Sensors Data May 2022 to Sep 2025 · 3 yrs
- Cloudflare Apr 2025 to Apr 2025 · 1 mo
- Cloudflare Bot Management Apr 2025 to Apr 2025 · 1 mo
- Adalyser Sep 2021 to Aug 2023 · 1 yr
- Stripe May 2022 to Apr 2023 · 11 mo
- jQuery Apr 2020 to Dec 2022 · 2 yrs
- Google Ads Conversion Tracking Jul 2021 to Oct 2022 · 1 yr
- Adyen Apr 2020 to May 2022 · 2 yrs
- Facebook Jan 2019 to Apr 2022 · 3 yrs
- Wheelio Sep 2021 to Oct 2021 · 1 mo
- PerimeterX Jul 2021 to Jul 2021 · 1 mo
- Nginx Apr 2018 to Apr 2021 · 3 yrs
- Ubuntu Apr 2018 to Apr 2021 · 3 yrs
- Google Plus Jan 2019 to Feb 2019 · 1 mo
- Quantcast Measure Jun 2018 to Jan 2019 · 7 mo
- webpack-2 Jun 2018 to Jun 2018 · 1 mo
Timeline
2025 2 added · 2 dropped · 1 switched
- dropped Sensors Data Nov 2025 · Analytics
- dropped Cloudflare Jun 2025 · CDN
- added Cloudflare Apr 2025 · CDN
- added Cloudflare Bot Management Apr 2025 · Security
- switched Cloudflare Bot Management HSTS Apr 2025 · Security
2024 2 added
- added React Router Nov 2024 · JavaScript frameworks
- added Lodash Feb 2024 · JavaScript libraries
2023 27 added · 2 dropped · 1 switched
- switched Adalyser Microsoft Advertising Dec 2023 · Advertising
- added Microsoft Clarity Dec 2023 · Analytics
- added LottieFiles Nov 2023 · Miscellaneous
- added Sentry Nov 2023 · Issue trackers
- added Ahrefs Jun 2023 · Analytics
- dropped Stripe Jun 2023 · Payment processors
- added Adalyser May 2023 · Advertising
- added Adjust May 2023 · Analytics
- added Amazon ALB May 2023 · Load balancers
- added Amazon Web Services May 2023 · PaaS
- added Backbone.js May 2023 · JavaScript frameworks
- added Baidu Analytics (百度统计) May 2023 · Analytics
- added core-js May 2023 · JavaScript libraries
- added Envoy May 2023 · Reverse proxies
- added Facebook Pixel May 2023 · Analytics
- added Google Analytics May 2023 · Analytics
- added Google Sign-in May 2023 · Authentication
- added Google Tag Manager May 2023 · Tag managers
- added Howler.js May 2023 · JavaScript libraries
- added OneTrust May 2023 · Cookie compliance
- added Open Graph May 2023 · Miscellaneous
- added PWA May 2023 · Miscellaneous
- added React May 2023 · JavaScript frameworks
- added reCAPTCHA May 2023 · Security
- added Sensors Data May 2023 · Analytics
- added Underscore.js May 2023 · JavaScript libraries
- added Webpack May 2023 · Miscellaneous
- added Google Sign-in Apr 2023 · Authentication
- dropped jQuery Feb 2023 · JavaScript libraries
- added reCAPTCHA Feb 2023 · Security
2022 23 added · 3 dropped
- dropped Google Ads Conversion Tracking Dec 2022 · Analytics
- added Open Graph Sep 2022 · Miscellaneous
- added Adalyser Aug 2022 · Advertising
- added Amazon ALB Aug 2022 · Load balancers
- added Amazon Web Services Aug 2022 · PaaS
- added Backbone.js Aug 2022 · JavaScript frameworks
- added Baidu Analytics (百度统计) Aug 2022 · Analytics
- added core-js Aug 2022 · JavaScript libraries
- added Envoy Aug 2022 · Reverse proxies
- added Facebook Pixel Aug 2022 · Analytics
- added Google Ads Conversion Tracking Aug 2022 · Analytics
- added Google Analytics Aug 2022 · Analytics
- added Google Tag Manager Aug 2022 · Tag managers
- added Howler.js Aug 2022 · JavaScript libraries
- added jQuery Aug 2022 · JavaScript libraries
- added OneTrust Aug 2022 · Cookie compliance
- added PWA Aug 2022 · Miscellaneous
- added React Aug 2022 · JavaScript frameworks
- added Sensors Data Aug 2022 · Analytics
- added Stripe Aug 2022 · Payment processors
- added Underscore.js Aug 2022 · JavaScript libraries
- added Webpack Aug 2022 · Miscellaneous
- dropped Adyen Jul 2022 · Payment processors
- dropped Facebook Jun 2022 · Widgets
- added Sensors Data May 2022 · Analytics
- added Stripe May 2022 · Payment processors
2021 12 added · 5 dropped · 1 switched
- dropped Wheelio Dec 2021 · Widgets
- added Adalyser Sep 2021 · Advertising
- added core-js Sep 2021 · JavaScript libraries
- dropped PerimeterX Sep 2021 · Security
- added Wheelio Sep 2021 · Widgets
- added Amazon ALB Aug 2021 · Load balancers
- added Amazon Web Services Aug 2021 · PaaS
- added Adyen Jul 2021 · Payment processors
- added Google Ads Conversion Tracking Jul 2021 · Analytics
- added Howler.js Jul 2021 · JavaScript libraries
- added PerimeterX Jul 2021 · Security
- added Webpack Jul 2021 · Miscellaneous
- added Facebook Pixel Jun 2021 · Analytics
- dropped Ubuntu Jun 2021 · Operating systems
- switched Nginx Envoy May 2021 · Reverse proxies
- added OneTrust May 2021 · Cookie compliance
- dropped Adyen Mar 2021 · Payment processors
- dropped Webpack Mar 2021 · Miscellaneous
2020 1 added
- added Baidu Analytics (百度统计) Dec 2020 · Analytics
2019 1 added · 3 dropped · 1 switched
- switched Google Plus Facebook Jun 2019 · Widgets
- dropped Facebook Apr 2019 · Widgets
- dropped Quantcast Measure Mar 2019 · Analytics
- added Google Tag Manager Feb 2019 · Tag Managers
- dropped webpack-2 Jan 2019 · Miscellaneous
2018 5 added
- added Webpack Jul 2018 · Miscellaneous
- added Google Analytics Jun 2018 · Analytics
- added Quantcast Measure Jun 2018 · Analytics
- added React Jun 2018 · JavaScript Frameworks
- added webpack-2 Jun 2018 · Miscellaneous