Is CP Calendar safe?

Low risk

CP Calendar fetches coding contest listings from the Clist API with an embedded API key.

CP Calendar is a popup extension for tracking coding and competitive programming contests. When it needs fresh contest data, its popup requests contest listings from the Clist API using a hardcoded API key in the request URL.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

Arjun Jv0.0.9Chrome Web Store
15Risk

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Where it sends data

Destinations our analysis observed CP Calendar contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • clist.by

    CP Calendar sends data to clist.by. No other extension we have analysed sends data here.

Updated 30 September 2026nahdeimiheknmpknkenfkmhonnlboeim