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Compare AI Tools

Pick two to five tools. Every cell comes from a verified record; anything unverified says so. There is no overall winner — the right choice depends on your task, budget and technical needs.

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Criterion	QuillBot	GPTZero	Originality.ai	CheckWise AI
Provider	QuillBot (Learneo)	—	—	CheckWise AI
What it is for	A suite of writing tools for paraphrasing, summarising, grammar checking and AI detection, popular with students.	An AI detection service that estimates whether a piece of text was written by a person, by an AI model, or by a mix of both.	An AI content detector and plagiarism checker aimed at publishers, agencies, writers and educators.	An independent document-analysis service that runs an AI-writing check and a similarity (plagiarism) check on the same upload.
Category	AI Writing & Content Creation, AI Learning & Tutoring, AI Detection & Plagiarism Checking	AI Detection & Plagiarism Checking	AI Detection & Plagiarism Checking	AI Detection & Plagiarism Checking
Latest confirmed model	—	—	—	—
Main capabilities	Paraphraser (Depends on plan) Summarizer (Depends on plan) AI Detector (Depends on plan) Grammar checker Team plans	AI Detector that highlights passages it suspects are AI-generated and gives an overall estimate Classifies text as human, mixed or AI, with sentence-level highlights (via the API) Plagiarism Check and Advanced Scan on paid plans Writing Replay / authorship tool that shows how a document was written, including copy-and-paste activity Chrome extension and Google Docs add-on, plus integrations listed for Google Classroom, Canvas and Zapier	AI Checker with sentence highlights and shareable/PDF reports Plagiarism Checker and bulk scanning Fact and AI hallucination checker Readability and grammar/spelling checkers Chrome extension that scans in Google Docs and can replay the writing process	AI content analysis Similarity (plagiarism) check File upload or pasted text Downloadable reports Automatic data purge
Inputs / outputs	Not documented	Not documented	Not documented	Not documented
Context window	Not documented	Not documented	Not documented	Not documented
Free plan	Yes Paraphraser 125 words per input; Summarizer 1,200 words; AI Detector 1,200 words per scan, 6 scans/day	Yes	Yes	No
Cheapest paid plan	Premium: $19.95/mo $8.33/mo billed annually Annual $99.95 billed yearly; monthly figure from QuillBot FAQ; regional pricing applies	Pricing not verified	Pricing not verified	No monthly list price
All plans	Free — Free Premium — $19.95/mo $8.33/mo billed annually Annual $99.95 billed yearly; monthly figure from QuillBot FAQ; regional pricing applies Team — Per seat for 2-10 seats ($89.95 per seat billed every 12 months); larger teams pay less per seat	Pricing not verified	Pricing not verified	Free — Free Starter — $3 $3.00 per check Plus — $25 $2.50 per check Business — $200 $2.00 per check
API access	No	Yes	Yes	No
Free API quota	None documented	None documented	None documented	None documented
API pricing	—	—	—	—
Open-weight / proprietary	Proprietary	Proprietary	Proprietary	Proprietary
Commercial use	See plan terms	See plan terms	See plan terms	See plan terms
Privacy & data	—	Review GPTZero's privacy policy and terms before uploading student or confidential work; its developer page states that documents sent through API calls are not stored or collected.	Check Originality.ai's privacy policy and data-use settings; the site states text submitted to the free tool may be used for training and account holders can opt out.	Deleted documents are removed immediately; remaining data auto-purges after 90 days. Documents are not used to train AI models.
Platforms & integrations	Web, Browser extension, Microsoft Word, Google Docs	Web, Chrome extension, Google Docs add-on, API	Web, Chrome extension, Google Docs, Firefox, API	Web
Learning curve	Beginner-friendly	—	—	Beginner-friendly
Advantages	Generous free tier Low-cost annual plan Simple interface	Sentence-level highlighting shows which parts of a text drove the result Fits into common education and writing workflows through Chrome, Google Docs and LMS integrations Developer API with code samples in many programming languages	Combines AI detection, plagiarism, fact-checking and readability tools in one product Team management, scan history and an API suit agencies and publishers The vendor openly advises that an AI score should be one signal among several, with a human in the loop	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
Limitations	Free paraphraser limited to 125 words and two modes Prices vary by region AI detection results are probabilistic	Detection results are probabilistic and can produce false positives; GPTZero's own site says no AI detector is 100% accurate and results should not be used as the final verdict or as the sole basis for academic or disciplinary decisions Scores can be less reliable on short, heavily edited or mixed human/AI texts Advanced features such as plagiarism checks and Writing Replay require a paid plan	Detection results are probabilistic and can produce false positives; Originality.ai itself says a score shouldn't be used alone for academic integrity discipline, so it should never be the sole basis for academic or disciplinary decisions The free Basic tier is limited to AI detection with a small daily scan and word allowance Text entered into the free tool may be used for training unless you have an account and opt out	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
Last verified	Oct 19, 2026	Oct 13, 2026	Oct 13, 2026	Oct 19, 2026

How to choose

Start from the rows that matter for your job: a free plan and learning curve for casual use; API access, rates and data terms for building products; context window and modalities for long documents or images. Provider claims are labelled as such; we do not rank.

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