What's the best day to launch ?

No day is better than another. planning is the name of the game . Usually 3 months go to market strategy is best .

Usually as early as possible . Some people launch on sunday as well , because ph has highest traffic that day

Launching on a Tuesday is like having a mini weekend mid-week - it gives your product the chance to shine without getting lost in the Monday rush or the end-of-week chaos. Plus, who doesn't love a little Tuesday surprise? 🎉 #ProductLaunchTips

As you can see on other comments, there's no best day to launch, trying to just copy, based on those type of things doesn't work, is like asking what is the best to keep, a leg or an arm... Both are important and focusing on those type of things doesn't bring value. The key thing is traction, successful launch on Product Hunt or even Crowdfunding is all about having a community behind it. For that you need to work on your partnerships, your marketing, get feedback from users and potential customers to ensure you're on the right track. If people relate with what you're building and see value in it they will join you and support you. You don't need a huge community, but you need some people that brings trust to the table and brings more people to build up the community. P.s.: Besides in your marketing you can set a plan to contribute to Product Hunt discussions and write articles/posts and mention you're launching on X day and people interested will save that info or follow you to keep updated. Hope it helps ;)