Surfer AI detector
Vendor Surfer Sp. z o.o. Official site surfer.ai/ai-content-detector How this card is sourced
Updated · AI Detector Index editors
Surfer's AI detector is free with no limit on checks and needs at least 100 words per scan, according to the vendor's help centre article updated 2 November 2026 (docs.surferseo.com, read 9 November 2026). The vendor is Surfer Sp. z o.o. of Wroclaw, Poland, whose main product is an AI search visibility and SEO content platform (surfer.ai/ai-content-detector, read 9 November 2026); the detector shares its page, word pool and help article with the Surfer AI Humanizer. The card is one of the text detectors in the detector index, and how this card is sourced explains why a tool with no published rate still gets a full card.
What Surfer detects
| Field | Value | Source |
|---|---|---|
| Content types detected | Text | surfer.ai/ai-content-detector |
| Generators covered | ChatGPT, Claude, Google Gemini, Other AI content generators, including content altered by writing tools or AI rewriters (vendor wording) | surfer.ai/ai-content-detector |
| Languages | English | surfer.ai/ai-content-detector |
| Input limits | Web tool: paste text; the help centre says the AI detector can be used as often as you need with no limits, and that text must be at least 100 words long for a scan to run. The Humanizer on the same page has a shared word pool of 500 words per month without an account, 1,000 with a free account and 50,000 with a subscription. API V1 exposes the AI Detector to Peace of Mind and Enterprise plans; no per-request size is published in the introduction article. | docs.surferseo.com/en/articles/9396434-su... |
| Free tier | Free and unmetered: AI detector: You can use it as often as you need; there are no limits! (help centre). Minimum 100 words per scan. The paid prompt on the page, Unlock Unlimited AI Detection, bundles the detector with 50,000 humanizer words and platform access | docs.surferseo.com/en/articles/9396434-su... |
| API | Yes, docs.surferseo.com/en/articles/5700335-su... | docs.surferseo.com/en/articles/5700335-su... |
| Integrations | Surfer API V1 (AI Detector and Humanizer endpoints; Peace of Mind or Enterprise plan), Keyword Surfer Chrome extension (Humanizer and AI detector inside ChatGPT), Surfer MCP, Surfer dashboard Humanizer tool (AI Detector % below the text box), Google Docs extension and WordPress plugin (Content Editor, not the detector) | docs.surferseo.com/en/articles/9396434-su... |
| Data retention | Privacy Policy, Customers (last modified January 23, 2026, Surfer Sp. z o.o.): a Customer's Data will be processed for the period necessary for the performance of the Contract, and after the termination of the Contract, for the period necessary for the pursuit of our legitimate interests, i.e. up until the statute of limitations for claims expires or up to 30 (thirty) days after the expiry of the Contract, which is related to the existence of backups of the Website. Entrusted Data: Within 30 (thirty) days from the date of termination of the Contract or receipt of a written request for deletion of the Entrusted Data, at your option, we will delete or return the Entrusted Data to you. Neither the detector page nor the policy states what happens to text pasted into the free tool. | surfer.ai/legal/privacy-policy-customers |
| Ownership | Surfer Sp. z o.o., Plac Solny 14/3, 50-062 Wroclaw, Poland, VAT ID PL8971860264 (site footer). The site header presents Surfer as part of the Positive group beside User, Signitic, Iconosquare, noCRM and Ubic. surferseo.com redirects to surfer.ai. The detector is a free tool of an AI search visibility and SEO content platform and shares its page and word pool with the Surfer AI Humanizer. | surfer.ai/ai-content-detector |
The detector page says the tool will "identify text generated with AI writing tools and pick out content that was not written by a real person", naming "ChatGPT content, Google Gemini, or other AI content generators" and "content altered by writing tools or AI rewriters" (surfer.ai/ai-content-detector, read 9 November 2026). The page describes its method in general terms: writing patterns, "n-grams and word frequency distributions", sentence difficulty and a "probability score" where "a higher score, therefore suggests AI content". The same analysis, it adds, "also includes a grammar checker".
Language coverage is one sentence in the FAQ: "At the moment, Surfer's AI detection tool has only been trained on content written in English" (surfer.ai/ai-content-detector, read 9 November 2026). The card records English as the one supported language, the same count the index gives Scribbr. The FAQ also says the detector "does not offer such capabilities at this time" for images or video, so the card's modality is text alone.
Input and limits come from the help centre, read 9 November 2026: "AI detector: You can use it as often as you need; there are no limits!", and under the troubleshooting FAQ, "Please make sure your text is at least 100 words long" (docs.surferseo.com). Inside the paid dashboard the detector appears as an "AI Detector %" below the Humanizer text box. Integrations are the Surfer API V1, which the API introduction lists as able to "Detect AI-generated content in your text (AI Detector)" for Peace of Mind and Enterprise plans (docs.surferseo.com, updated 4 November 2026, read 9 November 2026), the Keyword Surfer Chrome extension, which the help article says runs the Humanizer and detector inside ChatGPT, and Surfer MCP. No LMS integration is listed. The nearest cards are Writer, the other detector built into a content platform, and QuillBot, another free detector sold beside a paraphraser.
Limits and plans
| Plan | Price | Limits | Checked on |
|---|---|---|---|
| Discovery | 49 USD per month, billed yearly (Save $120) | AI SEO Optimization Guidelines; Surfy (AI SEO Assistant) & Humanizer; create or optimize 120 documents; track 10 pages. The comparison table lists AI Detector & Humanizer in every paid plan. | |
| AI Search Analytics | 82 USD per month, billed yearly (Save $156) | Track 50 AI prompts refreshed daily; Mention Gap and Brand Sentiments; 5 Brand Spaces; Brand Knowledge; MCP. | |
| Standard | 99 USD per month, billed yearly (Save $240) | Track 25 AI prompts refreshed weekly; create or optimize 360 documents; integrations; Brand Knowledge; 1-click Content Optimization; team collaboration; Plagiarism Checker; Rank Drop Detection. | |
| Pro | 182 USD per month, billed yearly (Save $444) | Everything in Standard; track 50 AI prompts refreshed daily; 5 Brand Spaces; 1-click Internal Linking; Content Ideas & Coverage Gap; Templates & Custom Voices; Cannibalization Report; MCP. | |
| Peace of Mind | 299 USD per month, billed yearly (Save $720) | Everything in Pro; track 100 AI prompts refreshed daily; unlimited documents and Brand Spaces (asterisked); Advanced SERP Analysis; personalized onboarding; dedicated success manager; API Access; MCP. | |
| Enterprise | Custom, tailored packages: SSO and enterprise-grade security, advisory program, custom limits, white-label, priority support. |
The detector costs nothing and is not metered, so the plan table below prices the Surfer platform whose every paid tier lists "AI Detector & Humanizer" in the comparison grid (surfer.ai/pricing, read 9 November 2026). The detector page's own upsell reads "Unlock unlimited AI detection and humanize 50,000 words with AI Humanizer", and the help centre gives the Humanizer's word pool: 500 words a month without an account, 1,000 with a free account and 50,000 with any subscription (docs.surferseo.com, read 9 November 2026). Those words belong to the Humanizer; the detector has no word pool. Prices below are as displayed with the page's "Billed yearly" label, read 9 November 2026.
Retention is stated for customer data and not for the free tool. The Privacy Policy for Customers, last modified January 23, 2026, says a customer's data is processed "for the period necessary for the performance of the Contract" and afterwards "up to 30 (thirty) days after the expiry of the Contract, which is related to the existence of backups", and that Entrusted Data is deleted or returned "within 30 (thirty) days from the date of termination of the Contract or receipt of a written request" (surfer.ai/legal/privacy-policy-customers, read 9 November 2026). Neither the detector page nor the policy says what happens to text pasted into the free tool, so the card's retention rank field is empty and the data retention ranking quotes the clause in its unranked table.
What the vendor claims
Surfer is recognized as one of the best AI detector, known for its accuracy and ease of use. (Detector page.) No accuracy rate is published. The page quotes a customer: Surfer's AI Detector is one of the most accurate tool we've tested, it's very precise at distinguishing human vs. AI-written content. We used it to power a large scale content analysis with 65k URLs.
The detector page states no accuracy rate. Its claim is a sentence, "Surfer is recognized as one of the best AI detector, known for its accuracy and ease of use", and a customer quotation from the CEO of Graphite calling it "one of the most accurate tool we've tested" after "a large scale content analysis with 65k URLs" (surfer.ai/ai-content-detector, read 9 November 2026). No percentage, sample or test date accompanies either, so the card carries no accuracy figure and no false positive rate, and the false positive ranking does not list Surfer.
The vendor's caveats are long and in its own FAQ, read 9 November 2026: "AI content detectors work pretty well, but they are not perfect"; they "might have trouble with more advanced AI results that look a lot like human writing"; "False positives can also occur when human-written content is mistakenly identified as AI-generated"; and detectors "can misinterpret content created by non-native English speakers due to cultural biases". The page's conclusion is that the tools "are good for initial screening, but human oversight is necessary".
The same page then sells the other side. Under the heading "Avoid AI content detectors" it says: "You can then rewrite your AI content to pass AI detector tools. This lets you adjust any AI-produced material to remain undetectable by AI detection tools like Originality, ZeroGPT, Quillbot, Copyleaks and Undetectable AI" (surfer.ai/ai-content-detector, read 9 November 2026). The Humanizer page says its output "can bypass AI detection tools like Turnitin, Copyleaks and GPTZero" (surfer.ai/ai-humanizer, read 9 November 2026). A free detector whose page names five competitors to evade is the caveat a reader should carry away.
What independent studies found
No study record in the studies index has tested Surfer as of 9 November 2026. The multi-tool studies on the index, Weber-Wulff 2023 with 14 tools and Walters 2023 with 16, did not include it; Van Vlasselaer 2026, which scored detectors on 40 humanised papers, did not include it either. The study count on this card is zero, and with no vendor percentage there is nothing for the claim versus evidence gap to compute.
The vendor's own account of its method, "detection algorithms that are trained on large datasets of both human-written and AI-generated texts" (surfer.ai/ai-content-detector, read 9 November 2026), names no model, training date or benchmark.
Where Surfer appears in the index
Rankings
Fits these use cases
- Not listed in a use-case view at this index version.
Surfer appears in one ranking, on a vendor-stated value read 9 November 2026 in the data file: languages lists its stated 1. It also qualifies for detectors with an API on the API V1 AI Detector endpoint, available to Peace of Mind and Enterprise plans. It is absent from the studies-based rankings, which need a record, from the free tiers ranking, which needs a monthly figure rather than an unmetered tool, from the data retention ranking, which needs a stated period for submitted text, and from LMS integrations.
Every detector card on the register shows the same fourteen fields, so a free unmetered detector with no published rate can be read in the same columns as the detectors that publish one.
Questions about Surfer AI detector
Is Surfer's AI detector free?
Yes. The help centre says the AI detector can be used "as often as you need; there are no limits", with a 100-word minimum per scan; the 500, 1,000 and 50,000 word pools apply to the Humanizer, read 9 November 2026.
How accurate is Surfer's AI detector?
The vendor publishes no accuracy or false positive rate; its page says the tool is "known for its accuracy" and quotes one customer, and no indexed study has tested it, read 9 November 2026.
Which languages does Surfer's AI detector support?
English only. The FAQ says the tool "has only been trained on content written in English", read 9 November 2026.
Does Surfer have an AI detection API?
Yes. The API introduction, updated 4 November 2026, lists "Detect AI-generated content in your text (AI Detector)" in API V1 for Peace of Mind ($299 a month billed yearly) and Enterprise plans, read 9 November 2026.
Does Surfer store the text you check?
The customer privacy policy of January 23, 2026 keeps customer data for the contract plus up to 30 days and deletes customer content within 30 days of a deletion request; it does not mention text pasted into the free tool, read 9 November 2026.
Does Surfer sell a tool to beat AI detectors?
Yes. The detector page says users can rewrite content "to remain undetectable by AI detection tools like Originality, ZeroGPT, Quillbot, Copyleaks and Undetectable AI", and the Humanizer page names Turnitin, Copyleaks and GPTZero, read 9 November 2026.
Sources and revisions
Sources
- surfer.ai/ai-content-detectorRead 9 November 2026
- surfer.ai/pricingRead 9 November 2026
- surfer.ai/ai-humanizerRead 9 November 2026
- docs.surferseo.com/en/articles/9396434-su...Read 9 November 2026
- docs.surferseo.com/en/articles/5700335-su...Read 9 November 2026
- surfer.ai/legal/privacy-policy-customersRead 9 November 2026
- surfer.ai/legal/privacy-policy-generalRead 9 November 2026
- surfer.ai/legal/regulationsRead 9 November 2026
