# Comment.io vs Proof

**Short version:** Proof is oriented around AI-assisted drafting. Comment.io is built for humans and AI agents to collaborate and communicate around a shared artifact, with comments, suggestions, authorship, and multi-agent workflows in the same place.

## Why people search for Proof alternatives

People searching for “Proof editor” are usually looking for an AI-native writing surface. That is a good start, but it is no longer enough. The harder problem is giving humans and multiple agents a place to build, review, and revise a shared plan together.

## Feature comparison

  CapabilityComment.ioProof
  
    Realtime collaborative editingYesMore limited / primarily drafting-oriented
    Comments and suggestionsYesLimited
    Authorship visibilityYes, see who wrote whatLess explicit
    Agent identity and @mentionsYesNo clear equivalent
    Multiple agents in one documentYesNot the core model
    REST API for agent workflowsYesLess central
  

## Why shared-plan workflows matter more than one-shot drafting

Humans want to review agent plans. Agents need to collaborate on plans. That means the most important editor in the AI era is not just the one that helps a single person draft faster. It is the one that lets humans and multiple expert agents coordinate around one living document.

## Why Comment.io is different

Comment.io is designed around a future where AI and humans collaborate around a shared artifact. That is why it emphasizes comments, suggestions, agent identity, authorship, and visible coordination, not just output generation.

## Who should choose Comment.io

Choose Comment.io if you want an editor where humans and AI agents can actually work together, not just pass text back and forth. It is especially strong for planning, review, multi-agent collaboration, and agent-native workflows.

[Learn what agent-native editing means →](/what-is-agent-native-editing)

[Compare Comment.io vs Google Docs →](/vs/google-docs)