StackShare lets you see the tools and technologies that companies actually use. You can browse stacks for companies like Airbnb, Spotify, and Slack, or search by tool to see who uses it and alongside what. The platform covers languages, frameworks, Databases, DevOps tools, and more. Each tool page shows which companies use it, alternatives, and community discussions.

It started in 2014 as a Hacker News project and grew into a community of over a million developers. The data comes from self-reported company stacks and community contributions, so accuracy varies, but it's useful for getting a rough sense of what's popular in a given industry or company size. Developers use it for technology selection, competitive research, and understanding how different parts of a stack fit together.