FastTool
Tool Finder

SEO TOOL

Schema Visual Builder

Build JSON-LD for Article, WebPage, SoftwareApplication, Product, FAQPage, Event, LocalBusiness, VideoObject, Recipe, and BreadcrumbList.

Reviewed and refreshed on 2026-06-17.

Browser-side analysis No signup Copyable report SEO

WHY THIS EXISTS

Specialized workflow, inspectable result

Build JSON-LD for Article, WebPage, SoftwareApplication, Product, FAQPage, Event, LocalBusiness, VideoObject, Recipe, and BreadcrumbList. The scoring is visible and repeatable so users can improve an input, rerun the tool, and copy a useful artifact.

Useful next checks

AI Hallucination Likelihood Scorer

Score an LLM answer for hallucination risk using entity density, citation gaps, temporal claims, hedging, contradiction hints, and unsupported specifics.

LLM Output Schema Extractor

Paste JSON or JSON-like LLM output and infer a Draft 2020-12 JSON Schema with nested objects, arrays, enums, required fields, and confidence notes.

Prompt A/B Tester

Compare prompt variants by clarity, constraints, output format, ambiguity, examples, token cost, and instruction-following likelihood.

System Prompt Optimizer

Tighten a system prompt by detecting redundancy, missing role, missing output contract, unsafe boundaries, and weak instruction hierarchy.