The best alternatives to Startup Buffer are Product Hunt, BetaList, and Upstart. If these 3 options don't work for you, we've listed a few more alternatives below.
Founded in 2013 as a tiny side project, Product Hunt has become the place for makers and companies to launch their latest app, gadget, or physical products to the world. It's a global community of friendly folks sharing and discussing the latest in tech.
BetaList is a community of makers and early adopters showcasing their startups and exchanging feedback. It provides an overview of upcoming internet startups.
Just Launched is a clean and simple alternative to startup indexes like Product Hunt, BetaList and BetaPage. With just one featured product a day readers can dive further into your product, and for makers, there's no competition!