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2026-08-01 crawl · observed, not inferred

Technology used by calendars.com

39
technologies detected
calendars.com
company
51-200
employees
retail
industry
united states
location

Recent changes

2026-08-01 dropped PhotoSwipeprovisional
2026-08-01 dropped Unpkgprovisional
2026-07-01 dropped Three.jsconfirmed
2026-07-01 switched Datadog → Contentsquareconfirmed
2026-06-01 dropped Criteoprovisional
2026-06-01 dropped Contentsquareprovisional
2026-06-01 dropped theTradeDeskprovisional
2026-06-01 dropped ID5provisional
2026-06-01 dropped Attentiveprovisional
2026-06-01 dropped Facebook Pixelprovisional
2026-04-01 dropped Microsoft Clarityprovisional
2026-02-01 dropped Contentsquareprovisional

Full detected stack

Everything detected on this domain in the latest monthly crawl, grouped by what it does. ↩ marks when we first observed it — no later than that date, not necessarily when they adopted it. Faded dates were seen in fewer than four crawls.

JavaScript libraries
Underscore.js↩ May 2020Lodash1.9.1↩ Jul 2021LazySizes↩ Feb 2022core-js3.32.2↩ Sept 2021Preact↩ Nov 2023Slick↩ May 2018Modernizr↩ May 2020jQuery3.2.1↩ Jul 2016
Advertising
Criteo↩ May 2019theTradeDesk↩ Nov 2024Microsoft Advertising↩ Feb 2021ID5↩ Jan 2026
JavaScript frameworks
Backbone.js1.4.0↩ May 2020React↩ Apr 2025RequireJS2.1.10↩ May 2020
Personalisation
Kibo Personalization↩ Feb 2021Monetate↩ Oct 2023Attentive↩ Aug 2024
Analytics
Sift↩ Sept 2024Google Analytics↩ May 2018Facebook Pixel2.9.373↩ Jul 2021
Ecommerce
Cart Functionality↩ Aug 2020Kibo Commerce↩ Feb 2021
Webmail
Apple iCloud Mail↩ Jan 2023Microsoft 365↩ Jul 2026
Accessibility
Nagich5.1.0↩ May 2025EqualWeb↩ May 2025
Font scripts
Google Font API↩ Jul 2016Font Awesome↩ May 2020
Security
HSTS↩ Aug 2024Cloudflare Bot Management↩ Oct 2021
CDN
Cloudflare↩ Oct 2021Amazon S3↩ Sept 2022
UI frameworks
Bootstrap3.3.7↩ May 2020
PaaS
Amazon Web Services↩ Sept 2022
A/B Testing
Contentsquare↩ Nov 2024
Marketing automation
Klaviyo↩ Aug 2021
Tag managers
Google Tag Manager↩ Jul 2018
Miscellaneous
Open Graph↩ Sept 2022
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