London-based Marker has emerged from stealth with a $13 million seed round, positioning itself as a direct antidote to AI-generated content that prioritises volume over craft. The round was led by Index Ventures, with participation from LocalGlobe.

High-Profile Backers

The angel investor list reads like a who's-who of writing and collaboration tools:

  • Steve Newman — co-founder of Writely, the product acquired by Google that became Google Docs
  • Cal Henderson — CTO and co-founder of Slack
  • Thomas Wolf — co-founder of HuggingFace

A Word Processor Built for the Messy Middle

Marker describes itself as a "reimagined word processor" — one designed not to replace the writer, but to support the actual process of writing: rough drafts, half-formed thoughts, and iterative revision.

Key features include:

  • Ideation — helping writers figure out what they want to say
  • Writing tools — designed to keep users in a creative flow state
  • Revision support — AI assistance during the editing and refinement phase
  • Collaboration — writers can add co-writers or commenters to their documents

The Founders

Marker was co-founded by Jon Steinback, former creative and brand lead at DeepMind, and Ryan Bowman, who has built platforms for writers inside literary and talent agencies.

"We're in a moment where people get to choose the future of writing, and I believe they will choose something that values the craft, rather than the slop brutally eroding it." — Jon Steinback, CEO

Fighting the Slop Tide

The launch arrives at a moment of genuine concern in the industry. Earlier this year, Synthesia CEO Victor Riparbelli publicly warned against "AI-sloppification" — the proliferation of LLM-generated content displacing real human writing.

Marker's investor thesis leans directly into this anxiety. As Georgia Stevenson, partner at Index Ventures, put it:

"Figma transformed how designers work together; Notion reimagined how teams organise ideas. But writing—the most universal creative act—got left behind, stuck between legacy word processors and automation tools. Marker offers a compelling new approach."