Already have a draft?
That’s where Thanis starts.
ChatGPT can help you brainstorm, draft, and revise. Grammarly can help you improve the writing as you go. Thanis reads the whole draft and shows you what needs work, why, and what to revise first.
Their capabilities overlap. The difference is how each product helps you with the writing.
What happens when you already have a draft?
Each tool can help with writing. The difference is how it helps once the draft already exists.
Brainstorm, draft, revise, ask questions, or work through ideas.
Improve language while you are writing or editing.
Step back and find out what still needs work before the draft goes out.
Ask for feedback, a critique, a revision, or anything else you want help with.
Keep writing or editing with Grammarly helping along the way.
Give Thanis the draft and choose the kind of review you want.
ChatGPT responds to what you ask and lets you continue the conversation.
Grammarly surfaces corrections, rewrites, clarity, tone, and other writing suggestions.
Thanis reads the draft as a whole and looks for the things that matter for that kind of writing.
Feedback, ideas, answers, rewrites, or generated language.
Corrections, rewrites, tone guidance, and other writing suggestions.
How the draft is doing, why, and the first thing you should work on.
Ask another question, use the feedback, or use generated text.
Accept, reject, or adapt suggestions as you edit.
Use the feedback to make the changes yourself.
ChatGPT helps you work through the writing. Grammarly helps you edit it. Thanis helps you decide what needs attention before you call the draft done.
Before you revise, Thanis answers three questions.
How is the draft doing?
See where the writing is strong and where it needs attention.
Why?
Understand what is helping or hurting the draft.
What should I work on first?
Start with the change most likely to improve the piece.
Thanis points the way. You make the change.
Here’s what Thanis shows you.
You wrote it. Thanis shows you what to work on next.
A real Thanis review of a history essay — captured from production.
The first thing to work on, on iPhone — captured from production.
How the draft is doing
Why it got that result
What Thanis is reviewing for
What to work on first
The review changes with the writing.
Academic
Check evidence, structure, mechanics, and clarity against the assignment or rubric.
Writer Pro
See where structure, pacing, tone, or momentum are holding the piece back.
Executive
Pressure-test assumptions, recommendations, reasoning, and ownership before the message goes out.
Which one fits what you need right now?
Need help getting started?
ChatGPT can help you brainstorm, explore ideas, draft, and revise.
Want help as you write?
Grammarly can help with corrections, rewrites, clarity, tone, and other edits along the way.
Already have a draft and want to know what still needs work?
Thanis reads the whole piece and points you to what deserves attention first.
Go deeper
Product capabilities change. This comparison reflects publicly described product information reviewed August 23, 2026.
Before you submit it, publish it, or send it,
run it through Thanis.
See what needs work, why, and what to revise first.