A polished demo can get someone to say, “That looks great.” The more useful answer is what they’d do with it on a Tuesday afternoon.

Say you’re building a tool that turns client feedback from email into a list of changes for a design team. Before building the full email integration, you could make a 15-second concept demo around a single handoff. Show a client asking to move a logo and change a headline. Then show those two requests as separate tasks a designer can pick up.

I’d use three screens and put most of the time into the last one. The inbox establishes the problem. The transition shows where the requests go. The task list gives the viewer time to read the result. If you want to sketch the transition with AI video, a keyframe tool such as Kling 4.0 AI Video Generator can help you explore the timing. I’d keep the actual email and task list as static mockups so the wording stays readable. I’d also put “Concept demo” on the video so viewers know what stage the feature is at.

Then I’d show it to a few people who already handle client revisions and ask two questions:

1. What would you expect to be able to do next?

2. Where would this fit into the way you handle revisions today?

The answers can point to very different next steps. If several people immediately ask whether each task links back to the original email, traceability may deserve a place in the first build. If they expect the tool to send a reply to the client, the demo may be promising more than the feature is meant to do. Either way, there’s something concrete to follow up on.

For founders who’ve shown a demo before the feature was ready, what viewer response actually changed what you built next?