Rewrite AI drafts in your own natural voice.

Undo-Ai takes stiff, overly-polished text and rewrites it to sound conversational and human — contractions, natural rhythm, the occasional typo, all the little things that make writing feel real. Runs on-device with Gemini Nano when available.

Add to Chrome See how it works

What it does

A

Natural voice rewrites

Paste a paragraph, pick a tone, get back a version that reads like a person wrote it — with genuine cadence, not template output.

B

Controlled imperfection

Optional light imperfections (contractions, common typos at realistic rates) so writing doesn't feel robotically clean. Off by default.

C

On-device AI

Uses Chrome's built-in Gemini Nano Prompt API when available — your text never leaves your machine. Graceful rule-based fallback otherwise.

D

Four tone presets

Casual, professional, academic, or creative. Each profile shifts word choice, sentence length, and register — not just vocabulary.

E

Private by design

No analytics. No servers logging your text. Only ExtensionPay sees that you're a paying customer — nothing about what you rewrite.

F

Works offline

The rule-based engine runs without any network. Once Gemini Nano is downloaded, the AI engine does too. Fully functional offline.

Responsible use

A quick note. Undo-Ai is a writing assistant for your own work — refining drafts, adjusting tone, making copy feel more natural. It's not designed to help misrepresent AI-generated work as human-written in contexts where disclosure is required (schoolwork, academic submissions, contracts, regulated journalism). Use it on your own writing, where your voice is the goal.

Pricing

Free

$0/forever

1 rewrite per day
1,500 character limit
Casual + professional tones

Monthly

$6.99/month

Unlimited rewrites
25,000 character limit
All tones + imperfection controls

Yearly

$69.69/year

Everything in Monthly
~17% savings
Priority support

Lifetime

$420 one-time

Everything, forever
No recurring charges
All future updates

Honest review? Free month. Leave a genuine 5-star review on the Chrome Web Store and claim 30 days of Monthly-tier access inside the extension.