Spacesheep (YC F26) — Documents of the future: the collaboration surface for people and…
Agents now write faster than anyone can read. Spacesheep is where their work lands: any agent turns a session's output into a space that your team takes in at a glance.
Spacesheep is a Y Combinator company in the Fall 2026 batch. Its directory entry describes it as: Documents of the future: the collaboration surface for people and…. The founder listed is Michael Makarov (Founder/CEO) (Y Combinator directory entry, October 21, 2026).
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What it does Documents of the future: the collaboration surface for people and… (source)
Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
Agents now write faster than anyone can read. Spacesheep is where their work lands: any agent turns a session's output into a space that your team takes in at a glance. It works with the agents you already use, and has its own agent built in.
Teams work on it together: comment on the exact spot, @mention a teammate, or ask @spacesheep and an agent makes the change live on every screen. Every change is a version, and every space is searchable by meaning, for people and agents alike. Spaces can show live data streamed from servers and sensors, and connect to the tools your team already uses.
Teams use it for research, design docs, dashboards, slides and internal apps.
spacesheep-devorganisation linked from the company's own record
Spaces are the place your teams and agents can be productive. Your AI makes the space; your team reads it, comments on it and builds on it.
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Counted only where a thread links to this company's own site, announces it by name on that forum, or names it beside its own Y Combinator batch. A thread whose title merely carries the words is not counted — a name is not an identifier. Hacker News is not us, and nothing above is our opinion of the company.
Michael Makarov
Founder/CEO
Founder/CEO of Spacesheep (YC F26). Previously MTS at Anthropic, where I built the internal app deployment framework and the first version of CC Artifacts. Before that, staff engineer at Pinecone and Twitter.
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 233 companies held here in B2B › Productivity.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
A Full Report on Spacesheep: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on Spacesheep covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
9 cited sources found
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Spacesheep (YC F26) — Documents of the future: the collaboration surface for people and…. MentionFox, 2026-10-22. https://mentionfox.com/funding/yc-spacesheep
