Free and open first

Best AI Detection Software in 2026

If you need to assess whether text may have been generated by AI, compare these tools by language coverage and word limit, then check for API access, a browser extension, and report export. Free plans, starting paid prices, and included team seats can help clarify fit for your workflow. The entries are ranked, beginning with Originality.ai, Pangram, and Winston AI, with Heynotai and TraceGPT also among the first options. Check the listed limits and access features against the languages and volume of text you expect to review.

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

1

AI Detect

Free plan Open source LinuxMacSelf-hosted+1

Choose AI Detect if local, offline-capable sentence scoring and batch review fit your workflow. Its free MIT-licensed distribution and multiple interfaces are useful for that purpose.

9.3 Free plan Visit site
2

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
3

Copyleaks AI Detector

Free plan APIExtensionSelf-hosted+1

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

7.6 Visit site
4

Heynotai

Free plan APIExtensionSelf-hosted+1

Heynotai combines multiple content checks with probability-based verdicts and reporting options. The free plan covers text and image checks, while audio and video analysis uses the opt-in API.

7.4 Free plan · paid from $8/mo (annual) Visit site
5

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
6

Compilatio AI Detector

Free plan APIWeb

Choose Compilatio AI Detector if you need AI likelihood estimates with highlighted passages, downloadable reports, or integrations for an educational institution.

7.3 Pricing on request Visit site
7

GPTZero

Free plan APIExtensionWeb

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

7.3 Free plan · 14-day trial Visit site
8

Grammarly
by Grammarly
Free plan AndroidiPhone

Choose Grammarly for a writing toolkit that combines proofreading, rewrites, tone tools, and monthly AI prompts across browser, desktop, and mobile apps.

7.2 Free plan · paid from $12/user/mo Visit site
9

Originality.ai

Free plan APIExtensionWeb

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

7.2 Free plan · paid from $12.95/mo (annual) Visit site
10

Sapling

Free plan APIExtensionSelf-hosted+2

Sapling brings team writing tools together with developer APIs, integrations and enterprise deployment options.

7.2 Free plan · paid from $12/user/mo (annual) · 30-day trial Visit site
11

SlopProx

Free plan ExtensionLinuxMac+1

SlopProx combines text, image, and YouTube filtering with locally processed detection.

7.2 Free plan Visit site
12

Detecto

Free plan Web

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

7.1 Free plan · paid from $6.99/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.

7.1 Free plan Visit site
14

IA Checker

Free plan iPhoneWeb

IA Checker combines detection and writing tools with document extraction and image analysis.

7.1 Free plan · 3-day trial 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.

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

Polygraf AI Detector

Free plan APIExtensionWeb

Polygraf combines AI-content detection with model identification, evidence, and verification, alongside related provenance tools.

7.1 Free plan Visit site
17

ScribeLens

Free plan APIExtensionWeb

ScribeLens combines sentence-level indicators, academic-document handling, and report exports, with a free plan for initial use.

7.1 Free plan · paid from $9/mo Visit site
18

Trinka

Free plan APIExtensionMac+3

Trinka combines academic and technical language tools with document proofreading and integrations.

7.1 Free plan · paid from $20/mo Visit site
19

TraceGPT

Free plan APIExtensionWeb

TraceGPT combines sentence-level AI analysis with plagiarism matching and several integration options.

7.0 Free plan Visit site
20

Is It AI?

Free plan Web

Is It AI? provides browser-based screening with explanations and several education plans. Treat its output as a review signal rather than conclusive evidence.

6.9 Free plan Visit site
21

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.

6.9 Free plan · paid from £399/yr Visit site
22

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
23

ZeroTrue

Free plan AndroidAPIiPhone+2

ZeroTrue offers checks across five media types, with review signals, API access, and a free plan.

6.9 Free plan · paid from $0.01 Visit site
24

Smodin AI Detector

Free plan ExtensionWeb

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

6.8 From $10/mo (annual) Visit site
25

Undetectable AI

Free plan APIExtensionWeb

Undetectable AI offers a no-signup detector alongside extension and API options, but its free trial is capped at 250 words.

6.8 Free plan · paid from $9.99/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

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