Tournament generator
Give it a list of teams and how long the day should be. It draws the tournament, schedules it across your courts, and gives you a link and a QR code to hand out. Then it runs the day: enter a result and the tables rebuild, the bracket fills in, and the next Swiss round draws itself.
Free, and there is no account to make first. About a minute to the QR code.
Pick a format by how long you have, not by what it is called
Most tournament software asks how many groups you want and how many teams advance. Those are answers to a question nobody has asked yet. The real decision is how much of a day you have and how many matches everybody should get out of it, and every format is a different trade between those two.
A straight knockout is the shortest day and the cruellest: half the field has played once by lunchtime. Everyone-plays-everyone is the fairest and the longest. Groups then a playoff is what most one-day tournaments settle on because it guarantees everybody two or three matches and still ends with a final. Swiss is what you run when the field is too big for groups and you still want nobody knocked out.
Whichever you pick, the number of matches and the rough finish time are on screen before you commit, worked out against the teams and courts you actually entered.
The day, not just the draw
A bracket image is the easy half. The hard half is the four hours afterwards: which match is on which court, what is being played right now, who won the one that just finished, and what that does to the table.
Whistle.day is built for the second half. Results go in from a phone at the side of a court, one match at a time. Everything downstream is the server's job — the winner, the bracket, the tables, the playoff slots waiting on a final position. A result tapped in at the net is on the wall about a fifth of a second later.
Free, and no account until you want one
There is no signup in front of the wizard. An account is created behind the scenes when you start a tournament, and you are offered the chance to put an email on it later — once there is something worth keeping. Nothing is capped, nothing is watermarked, and the projector view has no ads on it.
Common questions
Is it really free?
Yes. Every format, any number of teams, the projector view and the spectator view. A subscription only adds sponsor logos to the closing panel of the projector rotation, which is for clubs who sell that space.
Do I need to make an account?
No. Start a tournament and it works. You can put an email on the account afterwards if you want to open it on another device.
Can spectators follow along?
Yes — every tournament gets a link and a QR code for a phone-sized results view, and a separate one for a projector or a TV.