CheckWise AI is a web service where you upload a PDF, DOCX or TXT file (or paste text) and get two reports from one check: an estimate of AI-associated writing signals with highlighted passages, and a similarity check against indexed web pages and publications. It says it is independent and not affiliated with Turnitin or any other detection provider.
Gives students, researchers, writers and businesses a quick, pay-per-check way to see whether a document shows AI-writing signals or closely matches existing sources, without a subscription.
Why use CheckWise AI?
Practical benefits
One check covers both the AI analysis and the similarity check
Pay per check with one-time token packs — no subscription
Any document length; no word limits or per-page charges
Downloadable PDF report to keep or share
Who it suits
Students checking their own drafts
Researchers and writers reviewing manuscripts
Agencies and businesses screening submitted content
When another tool may fit better
Teams that need an API or LMS integration — none is listed
Making disciplinary or academic-misconduct decisions on a score alone
Very high volumes where a subscription service may cost less per document
Learning curve
Beginner-friendly
Skills needed
None — upload a file or paste text
Example workflows
Create a free account, upload a DOCX, then read the highlighted passages in both reports
Download the PDF report and review flagged sections against your own sources
What can it do?
AI content analysisEstimates AI-associated writing signals and highlights passages where supported.
Similarity (plagiarism) checkCompares text against indexed web pages and publications and groups matches by category.
File upload or pasted textPDF, DOCX and TXT up to 15 MB; a single paragraph also works.
Downloadable reportsPDF report on every plan; CSV export is also mentioned on the home page.
Automatic data purgeDeleted documents are removed immediately; remaining data is purged after 90 days.
Good for
Checking an essay or thesis draft before submission
Screening freelance or guest articles before publishing
Reviewing a report for unattributed matches to web sources
Where it runs
Web
Pricing and plans
Free trial Each account gets 1 free check (AI and similarity reports) until 1 January 2027, with no credit card. After that you buy one-time token packs: Starter $3 for 1 check, Plus $25 for 10 checks, Business $200 for 100 checks. Tokens are valid for 30 days; there is no subscription.
Plan
Price
Billing
Free trial / tier
Usage limits
Main inclusions
Model access
API access
Restrictions
Free
Free
one-time
1 free check, no credit card
1 check (AI + similarity) per account
AI content analysis
Similarity check
Downloadable PDF report
—
No API listed
Offer ends 1 January 2027
Starter
$3 $3.00 per check
one-time
—
1 check; token valid 30 days
AI content analysis
Similarity check
Highlighted evidence where supported
Downloadable PDF report
—
No API listed
Token expires after 30 days
Plus
$25 $2.50 per check
one-time
—
10 checks; tokens valid 30 days
Everything in Starter
—
No API listed
Tokens expire after 30 days
Business
$200 $2.00 per check
one-time
—
100 checks; tokens valid 30 days
Everything in Starter
—
No API listed
Tokens expire after 30 days
Prices in USD · List prices on checkwiseai.com · Taxes may apply · Verified Oct 19, 2026
None documented — the free plan above (if any) is for the app, not the API
Rate limits
Not documented
Context / input limits
Not documented
SDKs
Not documented
Streaming
Not documented
Batch processing
Not documented
Structured output
Not documented
Tool / function calling
Not documented
Commercial use
See the provider terms
Data retention & privacy
Deleted documents are removed immediately; remaining data auto-purges after 90 days. Documents are not used to train AI models.
A free CheckWise AI account is not the same thing as free API access. Unless a free API quota is listed above, API calls are billed separately.
Verified Oct 19, 2026
Advantages and disadvantages
Advantages
AI analysis and similarity check combined in one check
Simple per-check pricing with no subscription
Clear data-handling statements: own server, no training on documents, 90-day purge
Says plainly that AI detection is probabilistic
Disadvantages
AI detection can produce false positives and false negatives — the site says a score is an indicator, never proof
The size and scope of the similarity index are not described
No API or LMS integrations are listed
Purchased tokens are valid for 30 days
Supported languages are not stated
Privacy: CheckWise says analysis runs on its own server without sending text to an external AI API in the current configuration, documents are hidden from other users and not used for training or sold, and data is purged after 90 days. Payments go through Stripe.
Real-world examples
A student checking a thesis chapter
Sign up for a free account
Upload the chapter as a DOCX (up to 15 MB)
Read the AI-signal highlights and the similarity matches
Add citations or rewrite matched passages, then keep the PDF report
free check works (1 per account until 1 Jan 2027)
An editor screening a guest post
Buy a Starter token ($3, one check)
Paste the article text
Review matched sources and highlighted passages
Ask the writer about flagged sections rather than relying on the score
Every account gets one free check, covering both the AI and similarity reports, until 1 January 2027, with no credit card. Further checks need paid tokens.
How much does a check cost?
Starter is $3 for one check, Plus is $25 for 10 checks ($2.50 each) and Business is $200 for 100 checks ($2.00 each). These are one-time purchases, not subscriptions.
What files can I upload?
PDF, DOCX and TXT files up to 15 MB, or pasted text. There are no word limits or per-page charges.
Can an AI-detection score prove someone used AI?
No. CheckWise itself says AI detection is probabilistic and can be wrong in both directions; a score is an indicator to review alongside other evidence.
Does CheckWise AI have an API?
No API is mentioned on the site, so it is a web-only service.
What happens to my documents?
They stay bound to your account, are not used to train AI models, are removed immediately if you delete them and are otherwise purged after 90 days.
Is CheckWise AI connected to Turnitin?
No. It describes itself as an independent service, not affiliated with Turnitin or any other detection provider.
