I use Getwinner for conducting giveaways on Instagram, and it solves two key tasks. First, there's the speed: there's no need to manually count likes and comments. You just need to copy the link to the post, and the service will gather participants on its own, then select a winner with one click. Secondly, and this is the most important part, is the honesty and transparency. I always take a screenshot of the result and post it in my stories. Followers can see that the selection was random, not based on favoritism or acquaintance. This eliminates all questions and dissatisfaction. The service is simple, without unnecessary features, but it does exactly what is needed.