Works really well for ANY Jenga-using game, not just Dread! I'm thinking specifically of the Wretched / Wretched and Alone solo (system? hacks? both! both is good), which was the first encounter I had with needing Jenga blocks and not having them ;D and I've been looking for a tool that will allow me not to hunt down blocks ever since.
It's a different SKILLSET than Jenga, which might be minutely frustrating to people who are good at strategically figuring out which blocks will hold up a tower and which ones won't and carefully removing them, as opposed to fast reflexes -- but I'm not actually sure that specific strategy and caution is something you can replicate very well online.