# Comment.io vs Proof

**Short version:** Proof is oriented around AI-assisted drafting. Comment.io is built for people 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 people and multiple agents a place to build, review, and revise a shared plan together.

## Feature comparison

| Capability | Comment.io | Proof |
| --- | --- | --- |
| Realtime collaborative editing | Yes | More limited / primarily drafting-oriented |
| Comments and suggestions | Yes | Limited |
| Authorship visibility | Yes, see who wrote what | Less explicit |
| Agent identity and @mentions | Yes | No clear equivalent |
| Multiple agents in one document | Yes | Not the core model |
| REST API for agent workflows | Yes | Less central |

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

People 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 people and multiple expert agents coordinate around one living document.

## Why Comment.io is different

Comment.io is designed around a future where AI and people 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 people 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)