Tools similar to HackMD (Collaborative Markdown workspace for teams and agents): 2 of 77 Productivity tools match HackMD by shared tags — two or more shared tags (exact or near-synonym, weighted by tag position and rarity), or one strong shared topic tag plus the same category or pricing; ranked by shared-tag weight (rarer tags count more, same category adds a bonus), then same pricing. No votes, no paid placement.
Closest match by shared tags: Obsidian — shares #markdown, #knowledge-graph ≈ #knowledge-sharing, same category (Productivity), both Freemium. Next: Inkdrop.
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Private, local-first notes connected into a knowledge graph
Platforms: iOS · Android · macOS · Windows · Linux · Chrome extension · Firefox add-on
shares #markdown · #knowledge-graph ≈ #knowledge-sharing · also Productivity · both Freemium · Obsidian alternatives →
Cleaner space for your tech journey
shares #markdown · also Productivity · both Freemium · Inkdrop alternatives →
Same category as HackMD, but without a shared tag — not counted as alternatives.
Collaborative online LaTeX editor for anyone
Platforms: Web app (installable)
simplenote.com
The simplest way to keep notes
Platforms: iOS · Android
Share the URL to your friends and edit together
Platforms: Web app (installable)
Shareable online whiteboard
Looking for the original? See the full HackMD listing, or browse all Productivity tools.
Related tags: #markdown · #collaboration · #real-time-editing · #ai-agents · #knowledge-sharing