Top 10 AI Detectors (2026)

Originality.ai has the highest score on this page, 99. It covers 19 of the 20 features in full, and replays how a Google Doc was typed only through its browser extension. It reads a text and reports how much is likely AI, likely human, or a mix of the two, and highlights the sentences it doubts. It also checks for plagiarism, meaning copied text, against web pages and scans up to 6MB of files or links at once. Its site also offers free detectors for AI images and deepfakes, meaning fake or altered photos.

The Pro plan is $14.95 a month and renews 200,000 words of checking, counted in credits, where one credit covers 100 words. The free plan gives 100 credits once, about 10,000 words, not a monthly amount. Each extra seat, meaning one more paid user, adds $9.95 a month. A Moodle plugin (software that adds a feature to the Moodle learning platform) and an API (a way for other software to send text in and read the result back) are both included.

Pangram does one job: it detects AI in text, images and video, and marks passages edited by AI apart from passages fully written by AI. It reads 24 languages and needs at least 50 words before it will score a text, so a one-line answer cannot be checked. The company says it never uses submitted text to train its models, which matters for anyone pasting private work.

The Individual plan is priced at $20 a month and scans 300,000 words a month. A free account allows 20 credits a day, enough for about 2,000 words, so light users pay nothing. A grammar check was not found on Pangram's site, and a web page is checked only by selecting its text with the Chrome extension.

Winston AI checks text, images and deepfakes, meaning fake photos or video made by AI, and reads handwriting through OCR (software that turns a picture of text into real text). It detects AI writing in 16 languages and treats its result as a prediction, not an exact count of AI words. It has no permanent free plan, only a 14-day trial of 2,000 credits.

The Essential plan lists at $18 a month. The $9 printed in bigger type beside it on the pricing page is the price with the WINSTON50 coupon, a discount code typed in at checkout. It renews 100,000 credits a month, and AI detection costs one credit per word, so a 1,000-word essay spends 1,000 credits. The plagiarism check is left out of Essential and starts on the Advanced plan at $29.

GPTZero is built for classrooms. Besides scoring text, it can replay how a Google Doc was typed, edit by edit, so a teacher can see the writing happen. It reads English and more than 20 other languages. Each result comes with an AI probability score and a statement of how confident the tool is, which helps a teacher weigh a borderline result.

The Premium plan is $23.99 a month billed monthly, or $12.99 a month if paid a year ahead, and renews 300,000 words. The free plan checks 10,000 words a month with one advanced scan to try sentence highlighting. Catching paraphrased or humanized text, meaning AI writing reworked to look human, is still marked beta, meaning not yet final.

PlagiarismCheck.org has the lowest paid price on this page and the widest set of school connections. Its AI detector, called TraceGPT, scores each sentence and connects to seven learning platforms, Canvas and Moodle among them. It also runs plagiarism, grammar and authorship checks in the same report.

The AI Basic plan is $2.99 a month and includes 400 AI pages a month; the site does not say how many words a page holds. There is no free plan, only two free pages at sign-up. The main limit is language: AI detection works on English and Spanish text only.

Copyleaks is built around its API, so a company can put AI and plagiarism detection into its own product. It detects text from ChatGPT, Gemini, Claude and newer models in 30 languages, and flags look-alike characters and hidden text used to fool detectors. It also explains why a passage was flagged, phrase by phrase in six of those languages. It is certified SOC 2 and SOC 3, security audits that enterprise buyers often require.

Copyleaks blocks automated reading of its pricing page, so its prices were read on The AI Rankings and confirmed on SupWriter. The Personal plan is $16.99 a month for 100 credits, about 25,000 words. The Pro plan at $99.99 a month covers 25 seats, and a credit covers up to 250 words.

Sapling is first a writing assistant, and its AI detector is one tool inside it. The detector reads 16 languages and warns that a part-AI text can score low overall while some of its sentences score high, so the sentence view matters. It reads only selectable text, so a scanned image must be turned into text first.

The Pro plan is $25 a month, or $12 a month paid yearly, and it pays for both the writing help and the detector. The free detector stops at 2,000 characters a check, roughly one short email. There is no plagiarism check, no Google Docs detection and no school connection.

ZeroGPT has the most generous free plan on this page: no cost, up to 15,000 characters a scan and about 1,250,000 words a month. It scores text, highlights AI sentences and says the text checked is discarded after the result and not used for training. Its servers are in Germany and run under the European privacy rules known as GDPR.

The paid Pro plan is $14.99 a month and raises each scan to 100,000 characters. ZeroGPT does not claim to catch paraphrased AI text and offers no browser add-on or Google Docs tool, pointing users to WhatsApp and Telegram instead. It recommends at least 150 to 200 words for a stable result, so a short paragraph gives a weaker reading.

Grammarly added an AI detector to the writing tool many people already use. It names ChatGPT, Claude and Gemini and can replay a document's full typing history to show the author's own work. Its help pages are unusually frank: they say the percentage should not be treated as proof, because detection can be wrong.

The detector is not in the free plan. It needs Grammarly Pro, which is $30 a month billed monthly, or $12 a month paid yearly. Its plagiarism check compares the text against online sources. A scan of a web page from its address and a saved list of past AI scans were not found on Grammarly's pages.

Isgen leans towards students and reads more than 80 languages, the widest range here. It splits each result into human, AI and mixed shares and scores every flagged sentence. When a result is unclear, the company says its model defaults to calling the text human, which reduces false alarms on real writing.

The Academic plan is $14 a month and renews 350,000 words of detection. A free detector handles 5,000 characters a check, and a bulk tool scans many files at once. There is no browser add-on, no Google Docs tool and no team plan, so Isgen fits one person rather than a group.