JeopardyLabs — the most useful tool here for the most people
JeopardyLabs asks nothing of you. No account, no email, no trial. You open it, you build a board, you host it. That single decision is why it's ranked first: it removes every step between deciding you want a game and having one.
The library is the other half of it. Hundreds of thousands of boards other people already made, searchable, and copyable into your own version. For a huge number of teachers, the fastest path to a Jeopardy game is finding one that already exists on roughly the right topic and editing four clues.

What it is, precisely, is a question-and-answer board with a scoreboard attached. It shows the grid, it reveals the clue, and it gets out of the way. The scoreboard is built in and better than people give it credit for: you name each team, and the host adds or subtracts points with plus and minus controls as the round goes. The host decides who was right — the tool tracks the tally. For plenty of rooms that's exactly right.
I paid the $20 lifetime membership so I could build bigger boards, and I'd pay it again. That's not a hedge — it's the only tool in this comparison I've spent my own money on before I had a reason to write about any of them.
Where it loses: every board is written by hand, and every board looks like every other board. There's one standard board style, and its own FAQ says changing the colors means downloading the game and editing the HTML and CSS yourself — possible, but not something most hosts are going to do on a Tuesday. If you run a game once a month, none of that matters. If you run one twice a week, the manual entry is the thing that eventually stops you — that's exactly what happened to me.
Use it if: you need a board today, you don't want an account, you're happy writing the clues yourself, or somebody has probably already made the board you need. Kleveroo vs JeopardyLabs, compared.






