AI content detection: AI tools compared (9)

What aI content detection tools are for

AI content detection tools examine signals to estimate likely generation, identify textual overlap or inspect a file’s documented provenance. Those activities answer different questions. A passage matching a published source is not necessarily AI generated, and generated material may have no matching source. Compilatio, Copyleaks and Originality.ai offer text analysis among their functions. Content Credentials Verify reads provenance information. Resemble AI also looks for evidence of manipulated media across different formats. These tools can support editors, educators and people checking material they have received. For example, instead of challenging an author because a passage feels artificial, you can inspect flagged sections, review matching sources and request supporting drafts or context. That turns an impression into a more structured review. The output remains something to investigate. It should not become proof of authorship or misconduct simply because a service presents a confident assessment.

Example uses:

• You review flagged passages in an article before asking its author for context and supporting material.
• You look for matching text and inspect the corresponding sources to assess attribution and quotation.
• You inspect available provenance information in a received file before deciding whether to publish it.
• You investigate suspicious audiovisual material by comparing technical alerts with evidence about its original source.
• You test known examples from your organisation to understand errors before introducing a detection workflow.

Our picks by need

These picks follow simple rules applied to the verified data, with no partnership or affiliate link:

• Best scored : ZeroGPT. 73/100 on our access and transparency grid.
• Cheapest paid option : AI or Not. First plan at $5 per month.
• Open source : Content Credentials Verify. Public code, self-hosting possible depending on the project.

The main tools at a glance

ZeroGPT 73/100

ZeroGPT is for people reviewing texts for likely AI-generated passages or similarities to published texts. It also offers rephrasing, document summaries, grammar and spelling correction, and PDF detection reports. Features: Flag passages likely generated by AI; Look for similarities to published texts; Rephrase text. Free tier available. Runs on: web browser and API. Data hosting: European Union.

Compilatio 70/100

Compilatio helps educational platform users analyze texts for similarities with existing sources and changes intended to conceal borrowing. It also flags passages that may have been generated by AI. Features: Identify similarities with existing sources; Flag passages that may have been generated by AI; Identify changes intended to conceal borrowing. Entry price: €4.99 one-off payment, with a free tier. Runs on: web browser and API. Data hosting: European Union.

GPTZero 68/100

GPTZero helps people examine how texts were written. It estimates the presence of AI-generated text, flags suspicious passages, searches for similarities with published texts, and reconstructs writing stages. Features: Estimate the presence of AI-generated text; Flag suspicious passages; Search for similarities with published texts. Free tier available. Runs on: web browser, browser extension, and API. Data hosting: United States.

Copyleaks 65/100

Copyleaks helps people analyze texts and images for reused text or AI generation. It assesses the likely presence of AI-generated text, produces analysis reports and supports integration into another application. Features: Search for reused text; Assess the likely presence of AI-generated text; Detect AI-generated images. Entry price: $167.88 per year, with a free tier. Runs on: web browser, API, and browser extension. Data hosting: Several regions.

Originality.ai 65/100

Originality.ai helps people reviewing texts estimate the presence of AI-generated writing and search for plagiarized passages. It also assesses readability, checks grammar, and supports sharing analysis reports. Features: Estimate the presence of AI-generated text; Search for plagiarized passages; Assess a text's readability. Entry price: $12.95 per month, with a free tier. Runs on: web browser, browser extension, and API.

Content Credentials Verify 63/100

Content Credentials Verify lets people examining a file view its provenance and documented editing history. It displays declared authors and tools, compares image versions, and shows AI generation labels when present. Features: Read a file's provenance information; Display documented editing steps; Compare an image with its earlier versions. Free tier available. Runs on: web browser. Data hosting: On device.

Resemble AI 61/100

Resemble AI is for people checking audio, image, and video content for manipulation. It also supports detecting impersonation attempts, checking watermarks and provenance, and analyzing manipulation risks during meetings. Features: Identify manipulated audio, image, and video content; Detect impersonation attempts; Check watermarks and content provenance. Entry price: $0 pay as you go, with a free tier. Runs on: web browser, API, and browser extension.

AI or Not 58/100

AI or Not serves people examining content origins or manipulation. It analyzes images, text, audio, and video, looks for signs of face or voice manipulation, and supports checks through an API. Features: Analyze whether an image was generated by AI; Detect AI-generated text; Examine audio and video files. Entry price: $5 per month, with a free tier. Runs on: web browser, API, and iPhone and iPad.

SynthID Detector 43/100

SynthID Detector searches for SynthID watermarks for people checking images, audio files, or videos. It identifies watermarked sections and content originating from partner generators through these watermark checks. Features: Search for a SynthID watermark in an image; Check audio and video files; Identify watermarked sections. Free tier available. Runs on: web browser. Data hosting: Several regions.

The category in figures

Of the 9 tools in the category, 9 (100%) offer a free tier, 78% have a public API and 3 have a French interface. The median entry price, per month, is $12.95 (across 3 tools with a published price). 6 disclose where data is hosted, 3 of them in Europe or on device.

Also useful

These tools belong to another category but also cover this need:

• Grammarly Grammarly helps people write and revise texts. It corrects spelling and grammar, rephrases sentences, adjusts
• WriteHuman WriteHuman is for people who want to rephrase text while preserving its meaning. It varies sentences and vocab
• HumanizeAI.com HumanizeAI.com lets people writing texts rephrase content and correct grammar and spelling. It also identifies
• AI Undetect AI Undetect lets people revising texts rephrase them while preserving their subject. It imports documents, com

Choosing well and avoiding pitfalls

Define the question first: likely generation, copied passages, manipulation or documented provenance. Check the formats and languages actually supported. Test material with known origins, including French writing, translations and edited drafts where relevant. Examine the explanations, access to matching sources and whether exported reports are understandable. For team use, consider integrations and how authors can challenge a result. Review file retention and reuse conditions before uploading confidential material. Compare charging models based on document length, files or processing volume. Confirm that analysis limits and format restrictions fit the documents your team will review in practice.

A detector can flag human work or miss generated material. Translation and editing can change the signals it examines. Do not make adverse decisions solely from automated results. Review context, sources and evidence of the author’s process. Missing provenance information does not prove manipulation, while available credentials still require interpretation. Avoid submitting confidential manuscripts or personal work until you understand storage and reuse conditions. A clearly presented report can still contain an incorrect or incomplete assessment of the material.

To compare with the cost of using an AI model directly, see the API price calculator.

Free or paid?

Free versions often support a sample passage or file with restrictions on length and frequency. They are useful for understanding the report format. Paying may help with complete documents, shared workflows or report exports. Paid access does not turn an estimate into proof, remove detection errors or establish that the tool suits your specific review process.

Tools in the category with a free tier: ZeroGPT, Compilatio, GPTZero, Copyleaks, Originality.ai, Content Credentials Verify, Resemble AI, and AI or Not.

For which jobs?

The profiles that use these tools most, based on the use cases documented by publishers: content writers, teachers, researchers, marketers, video creators, and students.