AI Checker Review

Our Verdict

For a long essay or commissioned draft, it points you to paragraphs worth discussing with the writer. Do not upload confidential drafts: the text goes to an outside detector.

Official site

A free plan is listed; verify current limits before upgrading. Starts at JPY 680.00.

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check_circle Pros

• ✓Check an article and its images from the same credit balance.

cancel Cons

• ✕Human writing can score high; do not accuse someone on the score alone.
• ✕It will not catch plagiarism or factual errors.

Should you use it?

screening Japanese or English essays and commissioned articles before a human review

Skip it if: you need a definitive authorship ruling for a student submission

Is it worth the price?

Freemium Starts at JPY 680.00

Two 1,000-character text checks use up the signup allowance. If you only check a draft now and then, buy an add-on instead of paying monthly for credits that do not roll over.

The Free Tier

60 signup credits expire after 24 hours

Paid Upgrade

¥680/month

500 credits per month on Lite

One thing to know before you start

Compare a flagged passage with the writer’s earlier drafts before asking how it was written.

What people actually use it for

Review a contractor’s draft

Check the article, open the flagged paragraphs, and ask the writer about their drafting process before publication.

What does AI Checker actually do?

Paste 300–100,000 characters of Japanese or English text, or upload a UTF-8 TXT file, to see a score and the passages it flags. You can also upload images to check for signs of AI generation.

What you can do with it

Open flagged paragraphs from the overall text score

Download the text score and flagged passages as a PDF

Sort image results by AI likelihood and export a CSV

Technical details

text_input

300–100,000 characters; Japanese and English

txt_upload

UTF-8 TXT up to 1 MB

image_input

JPEG, PNG, WEBP; up to 10 images and 10 MiB each

Key Questions

Can I upload a Word or PDF document?

No. Paste the text instead, or upload a UTF-8 TXT file.

Does a check continue if I leave the page?

Yes, if the text was accepted before you left. Check recent results before submitting it again.