# Atat vs onUI — Fit & Features

Canonical: https://trutool.co/compare/atat-vs-onui
Author: Snehil (https://trutool.co/authors/snehil)

Compare Atat and onUI by use case, features, limitations, and evaluation questions.

## Compare fit, features, and limitations

### Atat
ATAT is an email client for AI Agents. Deploy dozens of AI agents through a single email address (IMAP/SMTP) using the OpenAI API. Just add credentials, create one email and the aliases you need, and you have agents over email. Just add.
Best fit: People and teams evaluating ai agents for a specific workflow.
- Core product workflow
Before you choose: Test a representative task, inspect outputs, and confirm integrations, permissions, data handling, licensing, and current costs.
Pricing: https://github.com/pricing
- [Read Atat profile](https://trutool.co/tools/atat): Read Atat profile

### onUI
Annotate/Draw any web UI for AI agents and export structured context, no app code changes required.
Best fit: People and teams evaluating ai agents for a specific workflow.
- Core product workflow
Before you choose: Test a representative task, inspect outputs, and confirm integrations, permissions, data handling, licensing, and current costs.
Pricing: https://github.com/pricing
- [Read onUI profile](https://trutool.co/tools/onui): Read onUI profile