How much does it cost to host a tournament?

Nothing. Hosting on CodeKairo Battles is free: the organization, drafting and publishing tournaments, the judge, the bracket, the scoreboard and the results. Players need only a free CodeKairo account.

Who can host a tournament?

Anyone signed in can create an organization — a college or university, a student club or chapter, a company or a community — and draft tournaments straight away. A tournament becomes public only once CodeKairo has verified its organization — before its first public event, and again if the organization's details change; the official name and website make that quick.

Can I edit or delete a tournament after creating it?

Yes, until it starts. A draft can be changed freely. Changes to a published tournament go to CodeKairo for approval, and it is hidden from players until they are approved; every registration is kept. A tournament that has not started can be deleted, with its registrations; once it has started it can only be cancelled, because its results are on players' profiles. Editing a verified organization sends it back for verification, and its tournaments are hidden until then.

Can I limit a tournament to students of my college?

Yes. Each tournament can be open to anyone, limited to email domains such as college.edu (subdomains count, look-alike domains do not), gated by an invite code, set to need your approval for every registration — or any combination of these — with an optional cap on places.

Which problems can I use?

Up to 15 problems chosen from the CodeKairo catalogue of about 600, each with hidden tests and starter code in 13 languages. Players see only how many problems there are until the start. Writing your own problems is not supported yet.

What do I see about the people who register?

Their CodeKairo name and the domain of their email address — enough to check that they are eligible — never the address itself.

How do I enter the teams for an ICPC-style contest?

Paste the list: one team per line, the team's name and then each member's CodeKairo email or username, separated by commas — a pasted spreadsheet works too. Up to 500 teams go in one upload; nothing is saved unless the whole list is clean, and every problem is reported with its line number.

Host a coding tournament

Create your organization, get it verified and run knockouts or ICPC-style contests on CodeKairo's judged problem catalogue. Limit entry by email domain, invite code or approval; you see entrants' email domains, never their addresses.

How do I host a coding tournament for my college on CodeKairo Battles?

Sign in with a CodeKairo account, create an organization — a college or university, a student club or chapter, a company or a community — and draft a tournament: a 1v1 knockout or an ICPC-style contest, the dates, who may enter and up to 15 problems from the CodeKairo catalogue. CodeKairo verifies the organization — and again if its details change; after that, publishing makes a tournament public and gives it a page to share, and CodeKairo approves any later change before players see it. Entry can be open to anyone or limited by email domain, an invite code or your approval, in any combination, with an optional cap on places. You see each entrant's email domain, never the address. The check-in, the bracket, the judge, the scoreboard and the results run themselves. Hosting is free.

How it works

Create your organization. The official name, the kind, the website and a line about it. Draft tournaments straight away; CodeKairo verifies the organization before its first tournament goes public, and again if its details change.
Draft the tournament. Pick the format, the start, the match or contest length and when registration closes. Choose up to 15 problems from the catalogue; players see only how many until the start.
Decide who may enter. Anyone; addresses on your email domains; holders of an invite code; people you approve — or a mix, with an optional cap. For a contest, paste the team list instead.
Publish, share, and let it run. Share the tournament's page. Every entrant is emailed a day and an hour before the start, and you can send another reminder whenever you like. On the day, check-in, the bracket, every match, the scoreboard and the results run without you; you approve registrations, watch matches and reveal a frozen board.

Who it is for

Coding clubs, student chapters, departments and placement cells, and companies running campus or community contests — anyone who needs a fair, judged event and has no wish to build, rent or babysit the infrastructure for it.

Frequently asked questions

How much does it cost to host a tournament?: Nothing. Hosting on CodeKairo Battles is free: the organization, drafting and publishing tournaments, the judge, the bracket, the scoreboard and the results. Players need only a free CodeKairo account.
Who can host a tournament?: Anyone signed in can create an organization — a college or university, a student club or chapter, a company or a community — and draft tournaments straight away. A tournament becomes public only once CodeKairo has verified its organization — before its first public event, and again if the organization's details change; the official name and website make that quick.
Can I edit or delete a tournament after creating it?: Yes, until it starts. A draft can be changed freely. Changes to a published tournament go to CodeKairo for approval, and it is hidden from players until they are approved; every registration is kept. A tournament that has not started can be deleted, with its registrations; once it has started it can only be cancelled, because its results are on players' profiles. Editing a verified organization sends it back for verification, and its tournaments are hidden until then.
Can I limit a tournament to students of my college?: Yes. Each tournament can be open to anyone, limited to email domains such as college.edu (subdomains count, look-alike domains do not), gated by an invite code, set to need your approval for every registration — or any combination of these — with an optional cap on places.
Which problems can I use?: Up to 15 problems chosen from the CodeKairo catalogue of about 600, each with hidden tests and starter code in 13 languages. Players see only how many problems there are until the start. Writing your own problems is not supported yet.
What do I see about the people who register?: Their CodeKairo name and the domain of their email address — enough to check that they are eligible — never the address itself.
How do I enter the teams for an ICPC-style contest?: Paste the list: one team per line, the team's name and then each member's CodeKairo email or username, separated by commas — a pasted spreadsheet works too. Up to 500 teams go in one upload; nothing is saved unless the whole list is clean, and every problem is reported with its line number.