CheckWise AI vs Grammarly — Fact-Based Comparison

Criterion	CheckWise AI	Grammarly
Category	AI Detection & Plagiarism Checking	AI Writing & Content Creation
In one sentence	An independent document-analysis service that runs an AI-writing check and a similarity (plagiarism) check on the same upload.	An AI writing assistant that checks grammar, tone and clarity wherever you type and can rewrite or generate text on request.
Problem it solves	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.	Everyday writing such as emails, reports and essays often contains errors or unclear phrasing, and checking it manually is slow.
Free plan	No	Yes
Developer API	No	Yes
Open source	No	No
Platforms	Web	Web, Browser extension, Windows, macOS, Microsoft Word, Google Docs
Pricing (summary)	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. Checked 2026-10-19	Free plan with basic corrections and 100 AI prompts per month. Pro costs $30 billed monthly, $60 per quarter, or $144 per year ($12/month), per member. Enterprise is priced through sales. Checked 2026-10-19
Strengths	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	Works across many apps without copy-pasting Low learning curve Generous free tier for basic correction
Limitations	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	Free plan limited to 100 AI prompts per month Advanced rewriting and plagiarism checks need Pro No public general-purpose writing API (only an audit logs API for Enterprise)