AI Detector API vs Winston AI

TL;DR

• Winston AI: web app + API, OCR layer for handwriting/scans, aggressive accuracy claims.
• AI Detector API: pure API, no OCR yet, clean sentence-level scoring, transparent pricing.
• Pricing: Winston AI starts ~$12/mo (Essential, ~80K words/mo). AI Detector API starts free, Pro $49/mo (50K requests).
• Accuracy: both publish high numbers. Independent benchmarks vary by content type.
• For OCR / scanned doc detection: Winston AI is the only practical pick.
• For developer integration in a SaaS product: AI Detector API is the faster integration.

Feature-by-feature comparison

When to pick AI Detector API

You're building a backend product that calls detection programmatically. You don't need OCR or a dashboard. You want predictable pricing tied to API calls, not word counts.

When to pick Winston AI

You need OCR/handwriting detection (academic plagiarism workflows). You want a polished web app for non-technical users. You're comfortable with a word-based pricing model.

The OCR question

Winston AI's most distinctive feature is OCR. You can upload scanned PDFs, handwritten student work, or images of text, and Winston extracts the text and runs detection on it. For academic workflows where students still submit handwritten assignments or scanned essays, that is genuinely useful.

AI Detector API does not include OCR. Our endpoint expects text. If you need OCR plus detection, you have two clean options: run a dedicated OCR layer (Google Cloud Document AI, AWS Textract, or Mathpix for math) and pipe the output into AI Detector API, or use Winston AI for that part of your pipeline. Decoupling tends to give you better OCR accuracy than the bundled product anyway.

Word count vs. request count pricing

Winston AI prices by word. Essential at $12/month gets you about 80,000 words. Advanced at $32/month gets you 200,000. If your average document is short, that is a generous allowance. If your documents are essays or research papers, word-count quotas burn fast.

AI Detector API prices by request. One detect call processes up to 50,000 characters of text and counts as one request. The Pro tier at $49/month covers 50,000 such requests per month. A 5,000 word essay and a 50 word forum comment cost the same in this model.

Which is cheaper depends entirely on your average document length. Run the math against your real workload before you pick.

Latency in production

Winston AI's published API tends to run 1 to 3 seconds for typical inputs, longer for OCR-bearing requests where the pipeline is doing image extraction before detection. That is fine for batch grading at end-of-term but slow for inline scoring at form submit time.

AI Detector API targets sub-300ms on the detect endpoint with p95 around 450ms. That is fast enough to call inline from a form, a moderation pipeline, or a quality gate without showing a loading spinner.

Migrating from Winston AI to AI Detector API

Both APIs are similar enough that the migration is mostly swapping the host, auth header, and response field names. If you were using Winston's OCR layer, you will need to add a separate OCR step before AI Detector API. We document the Document AI and Textract patterns in our SDKs page.

// Old (Winston AI, text only)
const r = await fetch("https://api.gowinston.ai/functions/v1/predict", {
  headers: {
    "Authorization": `Bearer ${process.env.WINSTON_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ text }),
});

// New (AI Detector API)
const r = await fetch("https://api.aidetectorapi.com/v1/detect/", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.AIDETECTORAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ text }),
});

FAQ

Related reading

• Best AI Detector APIs in 2026. Compared & Tested
• AI Detection APIs: Features & Integration Guide
• Quickstart. Detect AI Text in 5 Minutes