Privacy policy
Short version: no accounts, no tracking cookies, and your streak stays on your device.
Last updated 23 October 2026.
What we store on your device
When you press "I solved it" on a daily problem, the site saves your streak in your browser's localStorage under the key mycsmajor:streak:v1. It holds the dates you marked problems as solved, your current and best streak, and your total. This data never leaves your device and is never sent to us.
You can delete it at any time by clearing this site's data in your browser settings.
Cookies and analytics
We do not set cookies and do not use analytics or advertising trackers. If that ever changes, we will update this page before it happens.
Hosting
The site is hosted on Vercel. Like any web host, Vercel processes technical information such as IP addresses to deliver pages and protect against abuse. See Vercel's privacy policy for details.
Fonts are served from this site, not from a third-party font service.
Contact form
The contact form does not send data to a server. It opens your own email app with a pre-filled message. If you send it, we receive your email address and message, and use them only to reply to you.
Links to other sites
Pages link to other sites, such as vulnerability databases and shops. Some shop links may be affiliate links, which can tell the shop that you came from mycsmajor. Those sites have their own privacy policies. See the affiliate disclosure for how affiliate links work here.
Children
The site is aimed at students and does not knowingly collect personal information from anyone, including children.
Questions
Email hello@mycsmajor.com or use the contact page.