Free and open first

Best AI Content Detectors in 2026

AI content detectors can help you check writing for signs of AI generation or paraphrasing. Compare word limits and detection languages with batch scanning and API access, especially if you handle different volumes or workflows. Paraphrase detection and browser extension availability add other points to weigh, while free plans and paid-from pricing help frame costs. ContentDetector.org, AI Detectors.io, and GPTZero are among the options shown. Consider the languages and volume of material you expect to assess, then compare the listed access and checking features.

25 apps
Research read 23 Sept 2026
How the order is worked out

1

AI Detector Pro

Free plan AndroidAPIMac+2

AI Detector Pro combines document analysis with tools for changing English wording. Check its scan limits, text-sharing policy, and accuracy caveat against your needs.

7.7 Free plan Visit site
2

AI Detectors.io

Free plan APIExtensionMac+2

AI Detectors.io combines detection with several writing and verification tools, with access through web, extension, Word, and API.

7.6 Free plan · paid from $8.33/mo (annual) Visit site
3

ContentDetector.org

Free plan ExtensioniPhoneMac+2

ContentDetector.org pairs AI-text estimates with reports and a rewriting converter. Its own caveat is important: results may be wrong, so human review is recommended.

7.5 Free plan Visit site
4

Copyleaks AI Detector

Free plan APIExtensionSelf-hosted+1

Copyleaks combines multilingual AI-text detection with explanations, integrations, and an API.

7.5 Visit site
5

AI-Content Detector ML

Free plan ExtensionWeb

AI-Content Detector ML offers browser-based checks with visible confidence and support for three languages.

7.4 Free plan Visit site
6

Airno

Free plan APIWeb

Choose Airno if you need text and image checks, a detector breakdown, or REST API access, with a free plan available.

7.3 Free plan Visit site
7

Detecting-AI.com

Free plan APIWeb

Detecting-AI.com offers text review through a web detector, with free and paid plans and API options.

7.1 Free plan · paid from $7/mo (annual) Visit site
8

GPTZero

Free plan APIExtensionWeb

GPTZero combines AI-writing detection with writing and classroom tools, and offers web, extension, and API access.

7.1 Free plan · 14-day trial Visit site
9

It's AI

Free plan APIExtensionWeb

It's AI combines AI-writing estimates with plagiarism and language checks, and offers file uploads and several integrations.

7.1 Free plan · paid from $7/mo (annual) Visit site
10

Detecto

Free plan Web

Detecto combines several media checks with evidence and review workflows, plus account privacy controls.

7.0 Free plan · paid from $6.99/mo (annual) Visit site
11

GPTKit

Free plan APIWeb

Choose GPTKit if you need English text classification and want to start with free requests, including without an account.

7.0 Free plan Visit site
12

Originality.ai

Free plan APIExtensionWeb

Originality.ai combines AI detection with plagiarism, fact, readability, and writing checks across web, extension, and API options.

7.0 Free plan · paid from $12.95/mo (annual) Visit site
13

EyeSift

Free plan Web

Choose EyeSift if you want browser-based screening and writing tools on a free plan without signup.

6.9 Free plan Visit site
14

Isgen AI Detector

Free plan APIWeb

Isgen pairs text analysis with a set of writing and detection tools, and provides a free detector tier.

6.9 Free plan · paid from $8/mo (annual) Visit site
15

Pangram

Free plan APIExtensionWeb

Pangram combines AI-content checks, plagiarism detection, document uploads, and feed scanning in web, extension, and API offerings.

6.9 Free plan · paid from $20/mo · 7-day trial Visit site
16

TrustOriginality.ai

Free plan AndroidAPIExtension+3

Choose TrustOriginality.ai if you need to review multiple media types and document findings with verifiable reports.

6.9 Free plan · paid from €4.99/mo Visit site
17

Winston AI

Free plan APIExtensionSelf-hosted+1

Winston AI combines text and image detection with plagiarism checking, OCR and shareable reporting.

6.9 From $10/mo (annual) · 14-day trial Visit site
18

Learnaway

Free plan Web

Choose Learnaway if you want teachers to receive structured signals about how linked assignments were written while keeping the final decision with them.

6.7 Free plan · paid from £399/yr Visit site
19

Mask AI Detector

Free plan Web

Choose Mask AI if you want web-based AI detection with sentence highlights and a wider set of writing tools.

6.7 From $10.99/mo (annual) · 7-day trial Visit site
20

Proofademic

Free plan APIWeb

Proofademic combines writing checks, sentence-level reporting, and batch review, with stated language coverage across 23 languages.

6.7 3-day trial Visit site
21

Smodin AI Detector

Free plan ExtensionWeb

Smodin AI Detector offers multiple report indicators, broad language coverage, and a browser extension.

6.7 From $10/mo (annual) Visit site
22

ClassGuard

Free trial Web

ClassGuard combines student-specific writing profiles with detailed behavior review and classroom imports. Consider the editor-based data collection and paid model when evaluating it.

6.0 60-day trial Visit site
23

Content Checker by AI Aware

Free trial Web

Content Checker offers several levels of detail, including paragraph probabilities and sections behind a result.

5.7 Pricing on request Visit site
24

Elucida

Paid Web

Elucida offers institution-focused AI-writing identification with confidence scoring and a demo option. Schools should request pricing based on their size and license needs.

5.3 Pricing on request Visit site
25

TheChecker.AI

Paid APIExtensionWeb

TheChecker.AI combines AI-text detection with a Humanizer and multiple paid plans.

5.2 From $9.90/mo Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in AI Tools