stackbuffer's blog

By stackbuffer, history, 3 months ago, In English

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.

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