Code Calendar — An Open-Source, Ad-free app to keep track of Coding Contests on various websites.

Revision en2, by stackbuffer, 2022-07-04 18:14:42

Code Calendar allows you to keep an eye on various CP or competitive programming contests on platforms like Codeforces, CodeChef, LeetCode, Google Kickstart, etc. Use Code Calendar to never miss a contest on these platforms. It supports popular platforms such as Codeforces, CodeChef, Leetcode, AtCoder, etc.


  • Watch all the contest details from one page.
  • Filter contests based on the platform type.
  • Add the contest to your calendar with one tap.
  • Supports various calendar apps such as Google Calendar, Outlook, etc.
  • Supports all the timezones.
  • Visit the registration page with one tap.

Supported Platforms

  • AtCoder
  • CodeChef
  • Codeforces
  • HackerEarth
  • HackerRank
  • KickStart
  • LeetCode
  • TopCoder

Download it from the playstore:

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This app is open-source and the entire source code is available at

I'm using new account because I have to hide my ass from my company. I have recently joined in a company and one of the clause in their offer letter roughly says that "anything I build will become the company's property". So, I have to come up with a new account. Any feedback will be appreciated.

If this post is not relevant to this community, please tell me and I will remove this.


  Rev. Lang. By When Δ Comment
en2 English stackbuffer 2022-07-04 18:14:42 112 oops, I forgot to add the link to playstore.
en1 English stackbuffer 2022-07-04 18:13:13 1393 Initial revision (published)