Linguix vs Undetectable AI

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

Linguix

See full pricing history

USD · US · source: linguix.com

Plan	Pricing	Charged by	Offer type
Free — Free	Free $ 0 Forever	Flat · Forever	Standalone · Free
Linguix Pro — Pro Highlighted	USD 11.67 monthly · USD 11.67 / month with annual commitment $11.67 / month Billed $140 annually	Flat · Billed $140 annually	Standalone · Fixed

Undetectable AI

See full pricing history

USD · US · source: undetectable.ai

Plan	Pricing	Charged by	Offer type
10K words/month — default	USD 9.99 monthly · USD 5 / month with annual commitment $5.00 /mo Charged annually $60.00	Usage · 10K words/month	Standalone · Fixed
20K words/month — default	USD 19 monthly · USD 9.5 / month with annual commitment $9.50 /mo Charged annually $114.00	Usage · 20K words/month	Standalone · Fixed
35K words/month — default	USD 31 monthly · USD 15.75 / month with annual commitment $15.75 /mo Charged annually $189.00	Usage · 35K words/month	Standalone · Fixed
50K words/month — default	USD 42.5 monthly · USD 21.25 / month with annual commitment $21.25 /mo	Usage · 50K words/month	Standalone · Fixed

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

Linguix

Free — Free

Highlights Grammar & spelling: Basic

Included
Highlights AI writing suggestions: Limited

Included
Highlights Paraphrasing & rewriting: Limited

Included
Highlights Typing shortcuts: Basic

Included
Highlights Browser extension: Included

Included
Highlights Supported Linguix apps: Included

Included
Highlights Priority support: Excluded

Linguix Pro — Pro

Highlights Grammar & spelling: Advanced

Included
Highlights AI writing suggestions: More

Included
Highlights Paraphrasing & rewriting: Advanced

Included
Highlights Style improvements: Pro

Included
Highlights Clarity suggestions: Included

Included
Highlights Tone suggestions: Included

Included
Highlights Typing shortcuts: Unlimited

Included
Highlights Browser extension: Included

Included
Highlights Supported Linguix apps: Included

Included
Highlights Priority support: Included

Included

Undetectable AI

10K words/month — default

Highlights Passes AI detectors: Included
Highlights High quality, legible content: Included
Highlights Watermark and future proof: Included
Highlights Writing level matching: Included
Highlights API compatible: Included
Highlights Unlimited Human Auto Typer: Included
Highlights Unlimited AI Detecting: Included

20K words/month — default

Highlights Passes AI detectors: Included
Highlights High quality, legible content: Included
Highlights Watermark and future proof: Included
Highlights Writing level matching: Included
Highlights API compatible: Included
Highlights Unlimited Human Auto Typer: Included
Highlights Unlimited AI Detecting: Included

35K words/month — default

Highlights Passes AI detectors: Included
Highlights High quality, legible content: Included
Highlights Watermark and future proof: Included
Highlights Writing level matching: Included
Highlights API compatible: Included
Highlights Unlimited Human Auto Typer: Included
Highlights Unlimited AI Detecting: Included

50K words/month — default

Highlights Passes AI detectors: Included
Highlights High quality, legible content: Included
Highlights Watermark and future proof: Included
Highlights Writing level matching: Included
Highlights API compatible: Included
Highlights Unlimited Human Auto Typer: Included
Highlights Unlimited AI Detecting: Included

How their prices changed

Each dated row shows the public prices observed when that vendor’s pricing page changed.

Linguix

August 27, 2026 Source
- Free — Free: Free
- Linguix Pro — Pro: USD 11.67 monthly · USD 11.67 / month with annual commitment

Undetectable AI

August 27, 2026 Source
- 10K words/month — default: USD 9.99 monthly · USD 5 / month with annual commitment
- 20K words/month — default: USD 19 monthly · USD 9.5 / month with annual commitment
- 35K words/month — default: USD 31 monthly · USD 15.75 / month with annual commitment
- 50K words/month — default: USD 42.5 monthly · USD 21.25 / month with annual commitment