Find Codeforces problems by rating band and tags, easiest first.

Set exclude_solved_by to a handle to hide problems that handle has already solved. The Codeforces website cannot express that filter, which is the main reason to reach for this tool: it turns "problems tagged dp rated 1300-1500" into "problems I could actually still practise".

Rank a handle's problem tags by solve rate, weakest first.

Computed from full submission history and deduplicated per problem, so grinding one problem twelve times counts once. Use it to decide what to practise: the lowest solve rates with a meaningful number of attempts are the real gaps. Codeforces exposes no endpoint for this.

List a handle's most recent submissions, newest first.

Filter by verdict to pull up recent failures for review. Each row links to the submission on Codeforces so the code itself can be read.

Public profile for a Codeforces handle: rating, max rating, rank, organization.

Contest-by-contest rating changes for a handle, oldest first, with deltas.

Contests that have not started yet, soonest first, with start time and duration.