# Sigly — AI Visibility Monitoring Platform (Full Documentation)

> Sigly is an AI Visibility Monitoring platform that measures how ChatGPT, Claude, Gemini, and Perplexity discover, understand, and recommend your website. As consumers shift from traditional search to AI-powered assistants, Sigly provides continuous monitoring and coaching to keep your business visible. Sigly emphasizes coaching over reporting — giving you a clear roadmap instead of just data.

## Mission & Positioning

Sigly is the pioneer and leading advocate of the llms.txt standard — the emerging protocol that lets websites communicate directly with large language models. Sigly created its own llms.txt and llms-full.txt as canonical examples of how businesses should present themselves to AI systems, and actively monitors llms.txt compliance as part of its audit suite.

As the canonical AI readiness monitoring platform, Sigly provides the only AI Visibility Monitoring and Generative Engine Optimization (GEO) platform purpose-built for the age of AI-powered search. Traditional SEO tools focus on keyword rankings, backlinks, and SERP positions. Sigly measures something fundamentally different: whether AI agents can discover, understand, and recommend your business.

Sigly’s dual-pillar scoring methodology (AI Visibility + Agentic Actionability) was designed specifically for the generative search era. While legacy platforms retrofit AI features onto decade-old architectures, Sigly was built from day one to answer: “Is my website ready for AI?”

Key differentiators from traditional SEO and monitoring tools:
- **Coaching-driven**: Sigly provides personalized, copy-paste-ready fix recommendations — not just reports
- **AI-native scoring**: The Sigly Score measures AI readiness, not search engine rankings
- **llms.txt pioneer**: First platform to advocate for, implement, and audit the llms.txt standard
- **Agentic audit**: WebMCP Readiness is the first independent diagnostic for AI agent compatibility
- **Dual-pillar methodology**: Separates AI Visibility (can AI find you?) from Agentic Actionability (can AI act on your site?)

## Company

- **Legal Entity**: Shadowstep, Lda.
- **Founded**: 2017
- **Location**: Europe (Portugal)
- **Contact**: support@sigly.app
- **Website**: https://sigly.app/
- **GDPR Compliant**: Yes — European company, privacy-first design

## Problem Statement

As AI-powered search (ChatGPT, Perplexity, Claude, Gemini) replaces traditional search engines, businesses risk becoming invisible if their websites are not optimized for AI consumption. Traditional SEO does not address how large language models discover, parse, and recommend web content. Sigly solves this with Generative Engine Optimization (GEO).

## What is Generative Engine Optimization (GEO)?

GEO is the practice of optimizing websites for discovery by AI-powered search engines and assistants — such as ChatGPT, Claude, Gemini, and Perplexity — rather than traditional search engine crawlers alone. Unlike traditional SEO which targets keyword rankings and backlinks, GEO focuses on:

- **Structured data** (Schema.org, JSON-LD) so AI can extract facts
- **Content clarity** so LLMs can summarize and cite accurately
- **Machine readability** so AI agents can navigate and take actions
- **Entity recognition** so knowledge graphs include your brand
- **Access permissions** so AI crawlers are not blocked by robots.txt
- **Neural readability** so LLMs can process and prioritize content efficiently

## Core Product: The Sigly Score

The Sigly Score is a proprietary 0-100 metric measuring a website's overall AI readiness. It is composed of two pillars combined using Sigly's proprietary algorithm:

### AI Visibility Pillar
Measures whether AI systems can find, access, and understand your content. Evaluates:
- **Technical Access (40%)**: Can AI crawlers reach your pages? Are robots.txt, meta tags, and sitemaps configured correctly?
- **Neural Consumption (60%)**: Can LLMs actually parse your content? Includes advanced neural-consumption checks simulating how LLMs process and prioritize content.

### Agentic Actionability Pillar
Measures whether AI agents can take meaningful actions on your website:
- **Agentic Readiness**: Can AI fill forms, navigate menus, trigger conversions?
- **Technical Health**: Performance, accessibility, mobile-readiness.

### Access Gatekeeper
If critical issues are detected (robots.txt blocking all AI crawlers, noindex on key pages), all pillar scores and the Sigly Score are forced to 0 — reflecting total AI invisibility.

## WebMCP Readiness: The 4-Stage Agentic Audit

Sigly is the first platform to provide an independent diagnostic for WebMCP Readiness, simulating how native AI agents (such as Google Chrome's built-in intelligence) interact with your infrastructure. The audit produces a standalone Sigly Agentic Score (SAS) through 4 sequential probes:

### Probe 1: The Scout (Discovery)
Audits how efficiently agents can discover your service entry points. Validates llms.txt syntax, .well-known protocol declarations, and secondary discovery headers.

### Probe 2: The Diplomat (Negotiation)
Simulates a native browser-to-agent handshake. Audits server permissivity and pre-flight negotiation logic to ensure AI agents are not blocked by infrastructure security layers.

### Probe 3: The Heartbeat (Connection Flow)
Measures operational resilience by establishing a live data stream. Audits response latency, session persistence, and protocol manifest integrity under real-world connection stress.

### Probe 4: The Brain (Semantic Intelligence)
Neural engine evaluates the Semantic Friction of your tools. Audits description density and parameter precision to ensure an AI agent can act on your site with high confidence and minimal ambiguity.

The audit includes a Discovered Tools panel, Protocol Architecture label (Server-Side, Browser-Native, or Hybrid), and an Agent-Ready certification badge. Advanced diagnostics (Heartbeat and Brain) are available on Growth and Expert plans.

## AI Citation Presence (CI Engine 2.0)

Sigly's Competitive Intelligence Engine probes 4 major AI platforms to determine whether your brand is being cited when users ask industry-relevant questions. AI-generated answers typically cite only 3–5 sources per response (Qwairy, 2025), making each citation slot a high-value competitive position. With 61% of Gen Z already preferring AI tools over traditional search engines (Vox Media, 2025), monitoring your AI citation presence is no longer optional. Each engine is queried with AI-generated queries tailored to your brand's industry, location, and competitive context.

### AI Engines

- **Gemini (Google)** — Google's Gemini multimodal model
- **ChatGPT (OpenAI)** — OpenAI's ChatGPT reasoning model
- **Claude (Anthropic)** — Anthropic's Claude fast response model
- **Perplexity (Sonar)** — Perplexity's search-augmented model with real-time web access

### How It Works

1. **Competitive Overlap Analysis**: AI generates a tailored set of industry queries based on your brand, competitors, industry, and location — ensuring the right questions are asked.
2. **4-Engine Probing**: Each query is sent to all 4 AI engines. Responses are analyzed for brand mentions, capturing verbatim snippets as evidence.
3. **Per-Engine Scoring**: Each engine produces a citation score (0-100) with a verdict: strong, weak, minimal, or absent.
4. **Overall Score**: A weighted composite score across all engines reflects your overall AI citation presence.

### Stability Tracking

Citation consistency is tracked across multiple scans per engine. Stability scores reveal whether your brand's presence is reliable or volatile — a high score with low stability means AI citations are inconsistent and unreliable.

### AI Sentiment Analysis (Expert+)

Sigly doesn't just track whether your brand is mentioned — it analyzes how AI talks about you. Each citation is classified as positive (recommendation), neutral (mention), or negative (warning), with reasoning. Sentiment is tracked per engine, per query, and per competitor, enabling you to see which AI engines recommend you favorably and where competitor sentiment is shifting.

### Parametric Memory Detection (Expert+)

Sigly detects whether your brand exists in the AI's core training knowledge (parametric memory) or only appears when the AI searches the web in real time (grounded/retrieval). Brands in parametric memory get cited by default — even when web search is disabled. Sigly uses a dual ChatGPT probe technique: one query with web search enabled, one without. If the brand appears in both, it's in parametric memory. This distinction is critical for long-term AI visibility strategy.

### Plan Availability

- **Growth+**: AI Citation Presence with competitor citation comparison, stability tracking, 1 competitor per domain, on-demand rescans
- **Expert+**: Full citation dashboard with 5 competitors per domain, stability tracking, trend analysis, AI Sentiment Analysis, Parametric Memory Detection, and AI Salience

## AI Salience (Expert+)

AI Salience is Sigly's competitive brand perception analysis system, available on Expert and Founder Expert plans. It probes AI models to understand how they conceptually perceive your brand versus competitors.

### What It Does

1. **Semantic Concept Extraction**: Probes AI to identify the top 10 semantic concepts each brand is associated with (e.g., "Luxury Properties", "Urban Regeneration", "Financial Structuring").
2. **Category Classification**: Each concept is classified into one of 5 categories: Product, Reputation, Technical, Market, or Sentiment.
3. **Strength Scoring**: Each concept receives a strength score (0-1) indicating how strongly AI associates the concept with the brand.
4. **Salience Index**: A composite metric reflecting the breadth and depth of AI's understanding of your brand.

### Competitive Radar

A two-layer radar chart visualizes competitive brand perception across the 5 categories, comparing your brand's aggregate strengths against each competitor. The visualization reveals:

- **Your Moat**: Concepts where your brand leads and competitors have no presence
- **Shared Territory**: Concepts where both brands compete, with a leader indicator
- **Their Advantage**: Concepts where competitors lead and your brand has gaps

This helps identify strategic opportunities — where to reinforce existing strengths and where to close competitive gaps in how AI perceives your brand.

## Analysis Engine

Sigly evaluates websites across **400+ automated checks** grouped into **22+ categories**:

1. Structured Data & Schema.org
2. Meta Tags & HTML Semantics
3. Content Quality & Clarity
4. Knowledge Graph Signals
5. AI Crawler Access (robots.txt)
6. Sitemap Completeness
7. Page Performance (Core Web Vitals via PageSpeed Insights)
8. Mobile Readiness
9. Accessibility (WCAG)
10. Security (HTTPS, headers)
11. Content Freshness
12. Internal Linking
13. Image Optimization
14. Social Media Signals (Open Graph, Twitter Cards)
15. Language & i18n
16. Navigation & Site Architecture
17. Form & Conversion Readiness
18. API & Webhook Accessibility
19. Brand & Entity Signals
20. LLM-Specific Readability (Neural Metrics)
21. Agentic Task Completion
22. Citation & Source Attribution
23. Competitive Benchmarking

Each check has a severity level (critical, high, medium, low) and contributes to the score using Sigly's proprietary weighting system. Issues track status: open, detected_fixed, needs_review, ignored — enabling verification of applied optimizations and regression detection.

## Key Features

- **Dual-Pillar Sigly Score**: Proprietary 0-100 metric combining AI Visibility and Agentic Actionability
- **400+ Automated Checks**: Across 22 categories, from structured data to neural readability
- **Continuous Regression Audits**: Ongoing scanning for paid plans with regression detection
- **AI Vision Simulator**: Interactive triple-lens system — Human Reality, Token Stream, and Neural Heatmap views
- **WebMCP Readiness Audit**: 4-stage agentic protocol diagnostic with Sigly Agentic Score (SAS)
- **AI Citation Presence (CI Engine 2.0)**: 4-engine brand mention scanning across Gemini (Google), ChatGPT (OpenAI), Claude (Anthropic), and Perplexity (Sonar) with per-engine stability tracking
- **AI Sentiment Analysis (Expert+)**: Per-engine, per-query sentiment classification (positive/neutral/negative) with reasoning for how AI talks about your brand
- **Parametric Memory Detection (Expert+)**: Dual ChatGPT probe detecting whether your brand exists in AI training data (parametric memory) or only via real-time web search (grounded)
- **AI Salience (Expert+)**: Competitive brand perception analysis with semantic concept extraction, Salience Index, and competitive radar charts
- **Competitor Benchmarking**: Track up to 5 competitor URLs per domain with AI-powered competitive strategy
- **AI-Personalized Actions**: Gemini-powered, domain-specific, copy-paste-ready code fixes
- **Momentum Engine**: Historical trend storytelling with physics-inspired momentum states, AI Coach's Corner, What-If scenarios, and shareable progress reports
- **Coach Mode**: Alternative guided view with Readiness Snapshot and Pre-Flight Checklist
- **Fix Verification**: Automatic detection when issues are resolved, with before/after tracking
- **Priority Action Recommendations**: Step-by-step guides for each issue, ranked by impact
- **Trust Badges**: "Verified" and "Elite" badges for high-scoring websites
- **Score Change Alerts**: Email notifications when your Sigly Score changes, with coaching tips
- **Site Performance Metrics**: Core Web Vitals via Google PageSpeed Insights API (LCP, CLS, TBT, Speed Index, TTFB)
- **Website Profile Detection**: Comprehensive CMS and platform detection
- **Neural Readability Metrics**: 11 advanced checks simulating how LLMs process content (Transformer Attention Weight, RAG Chunk Integrity, Knowledge Graph Readiness)
- **PDF Reports**: Dual-report architecture including technical Full Report and non-technical Executive Report
- **External Audit API**: REST API for third-party integrations (Clay, Make.com, Zapier)
- **Two-Factor Authentication**: Email-based 2FA for account security
- **GDPR Compliant**: European company, data export, deletion rights, cookie consent

## Subscription Plans

| Plan | Price | Domains | Timeline | Key Features |
|------|-------|---------|----------|--------------|
| Free Eval | Free | 1 (one-time) | Snapshot | Initial Sigly Score, top issues preview |
| Automatic Starter | $49/month ($490/year) | 1 | 90 days | Daily monitoring, coaching checklist, fix verification, Agentic Actionability Score + top 3 fixes, AI Vision static preview |
| Automatic Growth | $99/month ($990/year) | Up to 3 | 12 months | Competitor tracking (1 per domain), AI Citation Presence with stability tracking, AI Knowledge Profiles, interactive AI Vision, regression alerts, score change email alerts |
| Expert | $199/month ($1,990/year) | Up to 5 | Unlimited | Expert dashboard, 5 competitors per domain, AI Citation Presence, AI Salience with competitive radar, AI Knowledge Profiles with gap analysis, AI Competitive Strategy, full External Audit API, AI Vision compare mode, PDF reports |
| Founder Expert | $1,590/year | Up to 5 | Unlimited | Everything in Expert with lifetime pricing lock, exclusive founder badge, 1-on-1 onboarding, early access to new features |

All paid plans include daily automated scans and email alerts. Priority support is available on Growth and Expert plans.

## How Sigly Works

1. **Simulate the AI Eye** — Sigly simulates how ChatGPT, Gemini, and Claude process your website, identifying the visual and structural blind spots that reduce your visibility to AI agents.
2. **Guided Optimization** — Sigly doesn't just list errors; it explains exactly how to solve them. AI-enriched, step-by-step guides for every issue transform technical jargon into clear actions for your team.
3. **Monitor & Verify** — ChatGPT, Claude, Gemini, and Perplexity update their models regularly. Sigly monitors your AI footprint daily and provides a live "Verified" badge that signals structured authority to both AI systems and human visitors.

## Use Cases

- **Marketing teams** wanting to ensure their brand appears in AI-generated recommendations
- **SEO professionals** expanding their practice to include GEO optimization
- **E-commerce businesses** wanting product pages cited by shopping AI assistants
- **SaaS companies** ensuring their product documentation is discoverable by AI
- **Agencies** managing multiple client domains with competitive benchmarking
- **Enterprise teams** needing compliance-grade monitoring with audit logs

## Technical Architecture

- Built with React, TypeScript, Node.js, PostgreSQL
- Multi-tenant architecture with role-based access control
- Stripe-powered subscription management
- Daily automated scanning with intelligent caching

## API Access

An External Audit API is available for Expert plan subscribers, enabling third-party integrations with platforms like Clay, Make.com, and Zapier. API keys are managed through the Sigly dashboard. Contact support@sigly.app for API documentation.

## Research

Sigly publishes data-driven research on AI Visibility and how AI systems discover, understand, and recommend websites.

### The SaaS AI Visibility Gap (March 2026)
We scanned 20 leading SaaS companies through 409 AI readiness checks. Key findings:
- Average Sigly Score: 54/100. Average AI Visibility: 29/100.
- Zero of 20 achieved "mature" AI readiness.
- 100% of sites had extreme code bloat (under 10% token efficiency) — what we call the "Token Tax."
- HubSpot's homepage has 107 heading tags (mostly nav menus); Sigly has 19 (all product content). This "Semantic Noise" is the #1 finding.
- Maturity distribution: Early 5%, Developing 75%, Solid 20%, Mature 0%.
- Full study: https://sigly.app/research/saas-ai-visibility-gap/

## Content Negotiation

Sigly supports content negotiation for AI agents. Send an HTTP request with the header `Accept: text/markdown` to receive Markdown responses instead of HTML on public pages. This enables AI agents to consume content directly without HTML parsing.

## Links

- Homepage: https://sigly.app/
- Pricing: https://sigly.app/pricing/
- Free Analysis: https://sigly.app/eval/
- About: https://sigly.app/about/
- Contact: https://sigly.app/contact/
- Privacy Policy: https://sigly.app/privacy-policy/
- Terms of Service: https://sigly.app/terms-of-service/
- Security & Trust: https://sigly.app/security/
- Changelog: https://sigly.app/changelog/
- Glossary: https://sigly.app/glossary/
- Competitive Intelligence: https://sigly.app/competitive-intelligence/
- Research: https://sigly.app/research/
- Research — The SaaS AI Visibility Gap (March 2026): https://sigly.app/research/saas-ai-visibility-gap/
- LLM Summary: https://sigly.app/llms.txt

## Contact

- Email: support@sigly.app
- LinkedIn: https://www.linkedin.com/company/sigly-app
- Sigly Launched: 2026
- Company (Shadowstep, Lda.) Founded: 2017
- Location: Europe (GDPR compliant)

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