Begin with three questions you need students to answer. Include one straightforward recall question and one that needs an explanation. A useful alternative to Gimkit must handle your content before its game mechanics matter.
Compare the response workflow
Blooket uses question sets in game modes. Wayground, formerly Quizizz, provides assessment activities. Kahoot offers quiz formats. Test each candidate with the same short set and inspect what you can learn from the responses.
Decide how much competition to use
Some lessons benefit from a timed round; others need students to think without a leaderboard. Give the explanation question separately if the game only captures a short answer. Keep that written response when assessing understanding.
Account for access and preparation
Check participant limits and device requirements on the plan you will use. Time the preparation and joining steps as part of the trial. A tool that saves a minute during play may require more work to author each lesson.
EarthGuessr is an option for a geography observation exercise, with satellite images rather than an editable question set. For that use case, ask students to explain a visible clue before seeing the location.