AI-Powered Screenshot Analysis

Analyze Any Web Page
with AI Vision

Capture a pixel-perfect screenshot and analyze it with OpenAI GPT-4 Vision in a single API call. Extract content, audit accessibility, monitor competitors, and automate visual QA -- all without building a pipeline.

No credit card required — free tier included

example.com
Captured
AI Vision Analysis
{
  "layout": "Hero + 3-col grid",
  "primary_cta": "Get Started",
  "colors": "Blue primary, white bg",
  "accessibility": {
    "contrast": "Good",
    "issues": 2
  },
  "seo_score": 87
}

How AI Vision Web Page Analysis Works

Three steps. One API call. Structured AI insights returned in seconds.

1

Capture

We render the target URL in a real Chromium browser. Full JavaScript execution, lazy-load scrolling, ad blocking, and cookie banner removal -- all handled automatically.

2

Analyze

The screenshot is sent directly to OpenAI GPT-4 Vision with your custom prompt. No intermediate storage. No extra uploads. It happens within the same request pipeline.

3

Receive

Get a structured JSON response containing the AI analysis text, token usage, and optional screenshot URL. Parse and integrate the results into your workflow instantly.

What AI Can See on Any Web Page

GPT-4 Vision interprets screenshots the way a human would -- but faster, at scale, and with structured output. Here is what you can analyze.

Content Analysis
Extract key information, summarize page content, identify topics and sentiment.
Design Audit
Evaluate layout quality, whitespace usage, color contrast, and typography choices.
Accessibility Check
Detect missing alt texts, poor contrast ratios, small touch targets, and WCAG issues.
Competitive Intelligence
Analyze competitor pricing pages, feature comparisons, and positioning strategies.
SEO Analysis
Audit visible meta content, heading hierarchy, internal link structure, and keyword usage.
Brand Consistency
Verify logo placement, color palette adherence, font consistency, and brand guideline compliance.
E-commerce Monitoring
Track product pricing, availability status, promotional banners, and checkout flows.
Social Proof Detection
Identify reviews, testimonials, trust badges, partner logos, and credibility signals.

Analyze a Website with AI in One API Call

Pass your OpenAI API key and a custom prompt. We handle the rest.

cURL
curl "https://api.nodium.io/api/v1/screenshot/take" \
  -H "X-Access-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://example.com",
    "format": "png",
    "response_type": "json",
    "openai_api_key": "sk-...",
    "openai_prompt": "Analyze this webpage. Describe the layout, identify the main CTA, and list any accessibility issues.",
    "openai_max_tokens": 1000
  }'
Response
{
  "screenshot_url": "https://cdn.nodium.io/s/abc123.png",
  "ai_analysis": "The page uses a centered hero layout with a bold headline, a subtitle paragraph, and two CTA buttons (primary: 'Get Started', secondary: 'Learn More'). Below the fold, three feature cards are displayed in a responsive grid. Accessibility issues: (1) The secondary CTA has a contrast ratio of 3.2:1, below the WCAG AA minimum of 4.5:1. (2) Two images are missing alt attributes.",
  "ai_tokens_used": 487,
  "credits_used": 3
}
Node.js
const response = await fetch("https://api.nodium.io/api/v1/screenshot/take", {
  method: "POST",
  headers: {
    "X-Access-Key": process.env.NODIUM_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    url: "https://example.com",
    format: "png",
    response_type: "json",
    openai_api_key: process.env.OPENAI_API_KEY,
    openai_prompt: "Analyze this webpage for accessibility issues.",
    openai_max_tokens: 1000,
  }),
});

const data = await response.json();
console.log(data.ai_analysis);
Python
import requests

response = requests.post(
  "https://api.nodium.io/api/v1/screenshot/take",
  headers={"X-Access-Key": "YOUR_API_KEY"},
  json={
    "url": "https://example.com",
    "format": "png",
    "response_type": "json",
    "openai_api_key": "sk-...",
    "openai_prompt": "Describe the page layout and list all CTAs.",
    "openai_max_tokens": 1000,
  },
)

data = response.json()
print(data["ai_analysis"])

AI Screenshot Analysis Use Cases

From visual QA to competitive intelligence, GPT-4 Vision web analysis unlocks workflows that were previously impossible to automate.

Automated QA & Visual Testing
Use AI vision for visual regression testing without brittle pixel-diff tools. Ask GPT-4 Vision to compare two screenshots and describe what changed -- layout shifts, missing elements, broken styling, or new content. Integrate into your CI/CD pipeline to catch visual bugs before they reach production.

Example prompt

"Compare these two screenshots and list every visual difference, including layout shifts, missing elements, and style changes."

SEO Content Auditing
Analyze competitor landing pages at scale. Extract heading structures, identify keyword density in visible content, evaluate above-the-fold messaging, and benchmark against your own pages. Run automated audits on hundreds of URLs to understand how competitors position their products.

Example prompt

"Analyze the SEO quality of this page: heading hierarchy, keyword usage in visible text, CTA placement, and content structure."

Accessibility Monitoring
Automate WCAG compliance checks by having AI Vision identify low-contrast text, missing form labels, small touch targets, unclear navigation, and poor visual hierarchy. Schedule daily scans across your site to catch accessibility regressions before users report them.

Example prompt

"Evaluate this page for WCAG 2.1 AA accessibility issues. Check contrast, text sizing, interactive element spacing, and navigation clarity."

Market Research & Monitoring
Monitor competitor pricing pages, product catalogs, and promotional campaigns automatically. Track when competitors update their positioning, add new features, or change pricing tiers. Build a dashboard of competitive intelligence powered by scheduled AI analysis.

Example prompt

"Extract all pricing information, plan names, feature lists, and promotional offers visible on this page."

Why Nodium for AI Vision Web Analysis

Other approaches require you to capture a screenshot, upload it to cloud storage, then send it to OpenAI. With Nodium, it is a single API call.

One API Call

No need to build a pipeline of screenshot capture, file upload, and OpenAI requests. One POST request does everything.

Your OpenAI Key

You provide your own OpenAI API key. You control costs, rate limits, and model access. We never store your key.

Custom Prompts

Send any prompt you want. Analyze for accessibility, extract pricing data, describe layouts -- the analysis is entirely yours to define.

Batch Processing

Combine AI vision with our bulk screenshot API to analyze hundreds of pages in parallel. Perfect for large-scale audits.

Any Input Source

Works with any URL, raw HTML, or Markdown. Analyze live pages, staging environments, or dynamically generated content.

Full Page Rendering

Real Chromium browser with JavaScript execution, lazy-load handling, ad blocking, and cookie banner removal before analysis.

AI Vision Pricing

AI Vision analysis adds 2 extra credits per request on top of the standard screenshot cost. You provide your own OpenAI API key, so you pay OpenAI directly for token usage at their standard rates.

1 credit for screenshot+2 credits for AI analysisYour OpenAI key & costs

Frequently Asked Questions

Everything you need to know about AI vision web page analysis with Nodium.

What AI models are supported for screenshot analysis?
We currently support OpenAI GPT-4 Vision (gpt-4o and gpt-4-turbo models). You provide your own OpenAI API key, so you automatically get access to the latest models available on your OpenAI account.
How much does AI vision analysis cost?
AI vision adds 2 credits per request on top of the standard 1-credit screenshot cost, totaling 3 credits per request. You also pay OpenAI directly for token usage through your own API key -- typically $0.01-0.03 per analysis depending on prompt length and max tokens.
Can I use a custom prompt for the analysis?
Absolutely. The openai_prompt parameter accepts any text prompt. You can ask for specific analysis like accessibility audits, content extraction, design reviews, pricing comparisons, or any other visual analysis task you can describe in natural language.
What is the maximum response length?
You control the response length with the openai_max_tokens parameter. You can set this up to 4096 tokens. A typical detailed analysis uses 300-800 tokens. More tokens means more detailed analysis but higher OpenAI costs.
Can I analyze screenshots in batch?
Yes. Combine AI vision parameters with our bulk screenshot endpoint to analyze up to 100 URLs in a single request. Each URL can have its own custom prompt, making it perfect for large-scale competitive analysis or site-wide audits.
Is my OpenAI API key stored?
No. Your OpenAI API key is used only for the duration of the request and is never stored, logged, or cached on our servers. It is transmitted securely via HTTPS and discarded immediately after the OpenAI API call completes.
How accurate is the AI analysis?
GPT-4 Vision is highly capable at understanding visual layouts, reading text, identifying UI elements, and detecting design patterns. Accuracy depends on your prompt specificity -- the more precise your instructions, the more accurate and structured the output. For best results, ask for specific observations rather than general analysis.
Can I use AI vision for continuous monitoring?
Yes. Combine AI vision with webhooks and scheduled requests to build automated monitoring pipelines. Set up hourly or daily scans of competitor pages, product catalogs, or your own site to detect changes, track pricing updates, or verify content accuracy over time.

Start Analyzing Web Pages with AI

Capture, analyze, and extract insights from any web page in a single API call. Sign up free and make your first AI-powered screenshot analysis in under a minute.

Free tier included — no credit card required