CP Submit - Codeforces & AtCoder

Write, test and submit Codeforces & AtCoder solutions from a side panel, through your own logged-in browser session.

CP Submit is a code editor for competitive programmers that lives in your browser's side panel. It works on both Codeforces and AtCoder. Open any problem and you get a full Monaco editor (the editor from VS Code). The sample tests are loaded automatically, and Run and Submit buttons talk directly to the judge. WHY IT DOESN'T GET STUCK Other tools fail over and over when Codeforces asks you to verify you're human. CP Submit sends every request from inside your own logged-in Codeforces or AtCoder tab. If a human check is still required, it opens the site's real submit page with your code already filled in. You never retype or re-paste anything, and it never hangs. FEATURES • Submit to Codeforces and AtCoder with live verdicts (In queue → Running → Accepted) • Run samples on the real judge (Codeforces Custom Invocation / AtCoder Custom Test), with the exact compiler you'll be judged with and no local setup • Custom tests, output comparison and a timing breakdown for every run • Code saved per problem and per language, kept across tabs and browser restarts • Templates for each language, with a $0 cursor marker • Vim key bindings, plus line numbers, cursor style, minimap, word wrap and more • Shortcuts: Ctrl+' to run, Ctrl+Enter to submit, Shift+Alt+R to reset • Themes: Light, Dark, Volcano, Cherry Blossom, Midnight, Deep Sea, Sunset • Problem timer with start, stop and restart PRIVACY CP Submit collects no data. It has no servers, no analytics and no accounts. Your code and settings stay in your browser, and the extension only talks to codeforces.com and atcoder.jp, as you. Open source (MIT): https://github.com/ionik0/cp-extension