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Measured on six things

Free AI detector for Spanish text, no registration required

Security

HTTPS enforced, but 2/12 on the header checklist: no HSTS, CSP, frame protection, Referrer-Policy or Permissions-Policy, and no SPF/DMARC. No security page, audit or bug bounty published.

Screenshots

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Detector de IA

About this app

Detector de IA is a free online tool designed to analyze whether a text might have been generated by artificial intelligence. By examining statistical and linguistic patterns common in outputs from models like ChatGPT, Claude, Gemini, and Copilot, it gives users a fast, probabilistic signal about a text's likely origin. The tool works directly in the browser with no signup, making it handy for students, teachers, marketers, editors, and writers. It handles Spanish-language content particularly well, accepts texts of varying lengths, and acknowledges the limits of AI detection — results are informative signals, not definitive proof. A clean, three-step workflow (paste, analyze, read result) keeps the experience simple, and the FAQ addresses common concerns like false positives and human-edited AI text.

Key features

1Free, no-signup AI text detection that runs entirely in the browser — paste text and get a probability score in seconds.
2Spanish-first detection tuned for Spanish-language academic, editorial, SEO and professional writing, a segment competitors treat as secondary.
3Honest FAQ addressing false positives, human-edited AI text and the factors that affect detection scores.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

University students & academics in Spanish-speaking countries

Pain points

Uncertainty about whether submitted work may be flagged as AI-generated; need to verify drafts

Primary needs

Quick, free, no-login checks of essays and assignments in Spanish

Demographic

Content marketers, SEO writers, and bloggers

Pain points

Balancing AI-assisted drafting with originality and editorial quality standards

Primary needs

Fast analysis of drafts to gauge AI-likeness before publishing

Demographic

Teachers, professors, and editors

Pain points

Difficulty distinguishing human writing from lightly edited AI text; risk of false accusations

Primary needs

A supporting signal within a broader review process, plus clear caveats on accuracy

Scout Review

Written by AI from measured evidence, scored out of 100.

Detector de IA is a fast, free, no-signup Spanish-language AI text detector that does exactly what it says and loads faster than most competitors' cookie banners. The paste-and-analyze workflow is frictionless, the FAQ is honest about false positives, and the Spanish-first positioning is a legitimate wedge against GPTZero, Originality.ai and Copyleaks, all of which treat Spanish as a secondary language. The problems are structural, not cosmetic. There is no published methodology or accuracy benchmark behind the probability score, the security headers are nearly absent for a tool that handles unpublished text, and there is no pricing page, API or institutional tier — meaning no visible path from free usage to revenue. It's a well-built free utility with a real niche and no business model attached to it. Worth using; harder to see how it grows.

Measure by measure

Usability

Paste, analyze, read result — no signup, no email gate, no credit card. FAQ covers false positives and edited AI text honestly. Help content is marketing copy, not real documentation.

Design

Clean single-column Spanish landing page with the paste box above the fold and a tidy three-step explainer. Functional and legible, but generic wordmark, stock icon bullets and zero visual identity beyond the copy.

Speed

Lighthouse mobile 100/100 with LCP 1.7s, CLS 0 and TBT 53ms; desktop 84/100. Static, lightweight page that loads before you finish reading the headline.

Security

HTTPS enforced, but 2/12 on the header checklist: no HSTS, CSP, frame protection, Referrer-Policy or Permissions-Policy, and no SPF/DMARC. No security page, audit or bug bounty published.

Accessibility

Lighthouse accessibility 96/100 with one failing audit: insufficient color contrast. Semantic headings and FAQ accordion in place, but Spanish-only and no WCAG statement published.

Growth

Real problem, real wedge: Spanish-first AI detection while GPTZero, Originality.ai and Copyleaks treat Spanish as an afterthought. But free, no-signup and no paid tier means no visible path to revenue.

Improvement areas

No published methodology or accuracy benchmark behind the probability score — users get a number with no way to interrogate it.
Security headers nearly absent (2/12) and no SPF/DMARC, despite handling unpublished user text.
No pricing page, API or institutional tier — free no-signup usage with no visible path to revenue.

Design & Usability

Detector de IA is a browser-only Spanish AI text detector, so the website is the product. The landing page does the job: paste box above the fold, a three-step explainer, a use-case grid for academic, blog, SEO and email text, and an FAQ that honestly names false positives and human-edited AI content as limits. Design is clean but anonymous — a wordmark, three stock glyphs and a lot of white space. Usability is the strongest part of the experience: no signup, no email gate, no paywall, and the workflow is literally paste, click, read. The weakness is depth: 'Fiabilidad' and 'Cómo funciona' are marketing copy, not documentation. There is no published methodology, no accuracy benchmark, no explanation of what statistical signals the detector actually weighs. For a tool whose entire output is a probability, that's a real gap — users get a number with no way to interrogate it.

Speed & Security

Speed is where this product genuinely shines. Google Lighthouse measured mobile performance at 100/100 with an LCP of 1.7s, CLS of 0 and TBT of 53ms; desktop came in at 84/100. The page is static and light, and it loads before you've finished reading the headline. Security is the opposite story. HTTPS is enforced, but the HTTP probe scored 2/12 on headers: no HSTS, no Content-Security-Policy, no frame protection, no X-Content-Type-Options, no Referrer-Policy, no Permissions-Policy. DNS shows no SPF and no DMARC records. There is no security page, no SOC 2 or ISO claim, no bug bounty, no audit. For a tool that asks users to paste unpublished essays, drafts and client work into a text box, that's a thin posture — not a breach, but not a signal of care either. A student pasting a thesis has no way to know whether the text is stored, logged or discarded.

Accessibility & Growth

Accessibility scores 96/100 on Lighthouse, with a single failing audit for insufficient color contrast — an easy fix that a human reviewer would have caught instantly. The site uses semantic headings and a working FAQ accordion, but it is Spanish-only with no language switcher and no published WCAG conformance statement. Growth is the most interesting dimension. The wedge is real: GPTZero, Originality.ai and Copyleaks all support Spanish, but none of them lead with it, and Spanish-speaking academia is a genuinely underserved segment. The problem is that the product is free, requires no signup, and shows no paid tier, no API, no institutional plan and no pricing page anywhere. That's a great acquisition strategy and a nonexistent revenue strategy. The site also concedes detection is 'una señal de referencia... no como una prueba absoluta' — honest, but it caps how much a university or publisher will pay for the output.

Conclusion

If you're a Spanish-speaking student, teacher or editor who wants a quick second opinion on a draft without handing over an email address, this does the job and does it fast. Treat the percentage as one signal among several, exactly as the site tells you to. If you're evaluating it as a product rather than a tool, the gaps are clear: publish the methodology, add the missing security headers, and decide whether this is a free public utility or a business. The Spanish-first angle is the most valuable thing here and it's currently being given away with no plan to capture any of the value it creates. Fix the monetization question and this becomes a genuinely interesting niche player.

Suggestions for improvement

Publish a methodology page explaining what statistical and linguistic signals the detector actually weighs, and any accuracy benchmarks you have.
Add the missing security headers (HSTS, CSP, X-Content-Type-Options, Referrer-Policy) and publish SPF/DMARC records for the domain.
Fix the color contrast failure flagged by Lighthouse — it's the only accessibility audit currently failing.
Introduce a paid tier or API for institutions, publishers and content teams; free no-signup usage is a great funnel with no exit.

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	Detector de IA	GPTZero	Originality.ai	Copyleaks AI Detector
Free tier without signup	Yes — fully free, no account required	Limited free checks; account required for more	No — paid credits required	Limited free trial; account required
Spanish-language detection quality	Primary focus — Spanish-first positioning	Supports multiple languages; Spanish secondary	Multi-language support; English-first	100+ languages supported; not Spanish-led
Plagiarism checking	No — AI detection only	No — AI detection focused	Yes — combined AI and plagiarism detection	Yes — full plagiarism and compliance platform
Institutional / API offering	None visible — no API or institutional tier	Yes — education plans and API	Yes — API and team plans	Yes — LMS integration, API, enterprise compliance
Published security/compliance posture	HTTPS only; no SOC 2, no security page, 2/12 headers	Privacy policy and security documentation published	Security and data handling documentation published	SOC 2, GDPR and enterprise compliance documentation