HackMD is where you collaborate with your team and communicate with your community in Markdown notes. You write in Markdown and HackMD presents source code, slides, charts, and math expressions for you. You control who can view/edit your notes and share them with flexible permissions. Since launch, more than 3,000,000 notes have been created and more than 13,000 teams have collaborated in HackMD. HackMD is where your short-term and long-term memory live together.