AI Detector & AI Checker - Free AI Text Detector

Scan AI text for AI-like patterns, confidence signals, and detector risk before you publish or submit.

AI Detector

Scan the draft before it leaves your hands

Use the detector when a draft feels a little too uniform and you want to know which sections deserve another pass.

Best fit

Before it goes out

It is most useful right before you submit, publish, or hand off a draft that was partly AI-assisted.

Essay submissions
Blog posts before publish
Client deliverables

What you get

If it gets flagged

A high score is a cue to edit the weak spots, not to throw away the whole draft.

Generic transitions
Flat sentence rhythm
Overly even wording

Next step

Then rewrite

Open the flagged sections in Lumi, rewrite what feels obvious, then do one last clean pass.

Humanize the flagged parts
Add detail and specificity
Check grammar last

Pairs well with

AI Humanizer

Rewrite the flagged sections into cleaner, more natural copy.

Paraphrase Tool

Rework only the lines that need a tighter rewrite.

Grammar Checker

Do the final cleanup after the tone is right.

Review AI-style signals with familiar tools

Writers often compare Lumi results with the services already in their workflow so they can spot passages that still feel overly uniform, generic, or machine-like.

See why certain passages raise AI-like signals

The AI detector helps you notice repeated sentence structures, flat transitions, and phrasing that feels too polished or generic for the context.

Fast scan

for long-form drafts and short copy

Clear cues

to decide what to rewrite next

See where detection review fits in the Lumi flow

Most users rewrite first, then run a last detection check to catch sections that still feel too uniform before the draft goes out.

Final scan

before publish or submission

Fast cues

to see what to rewrite next

Useful before publishing, submitting, or sending

Customers use the detector to reduce uncertainty, prioritize edits, and understand which passages need a more natural rewrite.

45.3M

words improved

150K

active users worldwide

4.8

average rating

languages supported

Alex Rodriguez

Law Student, Harvard University

It helps me turn rough AI-assisted drafts into something I would actually submit.

I use Lumi to smooth repetition, tighten sentence flow, and make sure the final draft sounds like me before I hand anything in.

Cleaner final draft

Maya Chen

Tech Blogger, TechCrunch

Our first drafts sound less generic and need fewer manual edits.

We use Lumi to reshape outlines and AI-assisted copy into publishable posts with clearer tone, structure, and pacing.

Faster editing

Jordan Smith

PhD Candidate, MIT

It catches awkward phrasing before it reaches my team.

The rewrite and grammar workflow gives me a cleaner version without losing the original point, which saves a lot of revision time.

Fewer revision rounds

Sarah Williams

Business Consultant, Strategy Partners

Client emails sound more personal and still stay on-brand.

Instead of rewriting from scratch, I use Lumi to polish tone and keep the message aligned with our style guide before it goes out.

2x faster turnaround

Michael Torres

Graduate Student, Stanford University

The detector plus rewrite workflow makes review much easier.

I can spot passages that feel formulaic, then revise them into something clearer and more natural without losing the main idea.

Better review flow

Emily Zhang

Graduate Researcher, Oxford University

It helps our research notes read smoothly without overediting.

I still review everything manually, but Lumi removes stiffness and repetition in the draft stage so the final polish is much easier.

Stronger clarity

4.8/5 from 1,240 reviews

Used in review workflows where confidence matters

From student drafts to client deliverables, the detector gives teams one more review layer before final approval.

Simple, Transparent Pricing

Choose the plan that works best for you. Upgrade or cancel anytime.

Starter

$9.90

Per month

or $6.00/mo on

10,000

words / month

500

per request

AI HumanizerBypass Turnitin, GPTZero etc.
AI Detector
Grammar Checker
Paraphrase Tool
Plagiarism Checker
1 Custom Writing Style
Live Chat + 48h Email Support

Pro

$29.90

Per month

or $15.00/mo on

100,000

words / month

1,000

per request

AI HumanizerBypass Turnitin, GPTZero etc.
AI Detector
Grammar Checker
Paraphrase Tool
Plagiarism Checker
3 Custom Writing Styles
Live Chat + Priority Email Support

Unlimited

$49.90

Per month

or $29.99/mo on

Unlimited

words / month

3,000

per request

AI HumanizerBypass Turnitin, GPTZero etc.
AI Detector
Grammar Checker
Paraphrase Tool
Plagiarism Checker
10+ Custom Writing Styles
Brand Glossary (Term Lock): Protect brand names & terms
Live Chat + Priority Email Support

Still on the fence?

Start with Starter now, upgrade when you need more power. No commitments, cancel anytime.

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Frequently asked questions about the AI detector and AI checker

Answers about what Lumi’s AI detector and AI checker measure, how to interpret the score, and how to use them in your editing process.

What does Lumi’s AI detector actually check?

It reviews patterns that often make text feel machine-like, such as repetitive structure, generic transitions, and overly consistent phrasing. The score is meant to support review, not replace judgment.

Does a high AI score mean the writing is bad?

Not necessarily. A high score usually means the draft reads as more formulaic or uniform than expected. Some technical, formal, or highly structured writing can also look AI-like even when it is accurate.

What should I do after a draft is flagged?

Review the passages that feel repetitive or generic, then rewrite them for specificity, stronger transitions, and a more natural tone. Many users run the text through Lumi Humanizer after the initial check.

How much text do I need for an AI detection check?

You will get the best signal from a substantial sample rather than a single sentence. Longer inputs give the detector more structure and rhythm to evaluate.

Can I use the AI detector for essays, blogs, and client work?

Yes. It is useful anywhere you want an extra review step before publishing, submitting, or handing a draft to someone else.

Is the AI detector the final answer on whether text is AI-generated?

No. Detector scores should be treated as directional signals. Different tools weigh patterns differently, so the best workflow is to use the result as a cue for revision, not as an absolute verdict.

Which Lumi tools pair well with the detector?

The most common follow-up tools are AI Humanizer for more natural phrasing, Grammar Checker for cleanup, and Paraphrase Tool for targeted rewrites of flagged sections.

Can the detector help with responsible AI use?

Yes. It gives you a way to review how your draft reads before you rely on it, which is especially helpful when quality, tone, and disclosure standards matter.

Still have questions? Visit our help center or read our blog guides for more insights.