30 tools · Privacy-first architecture
Developer Utilities
JWT, cron, DNS, SEO audits, CodeJudge, and JSON-to-types.
Security & Cryptography
JWT auditing, password analysis, security headers, and cryptographic key generation.
Decode and inspect a JWT
Header, claims, expiry, alg=none, and optional HMAC verify with Web Crypto.
Launch toolGenerate UUIDs and API keys
Bulk UUID v4 / v7, NanoID, and API keys from Web Crypto.
Launch toolScan a site's security headers
Score CSP, HSTS, X-Frame-Options, and Permissions-Policy from A+ to F.
Launch toolAnalyze password strength and entropy
Calculate Shannon entropy, estimate crack times across hardware tiers, detect keyboard walks and common patterns, and review NIST SP 800-63B recommendations.
Launch toolData & Format Conversion
YAML, JSON, TOML, CSV, type inference, Base64/Hex encoding, and structural diffs.
Turn JSON into TypeScript, Python, or Go types
Infer TypeScript, Pydantic, and Go types from a JSON sample.
Launch toolEncode or decode Base64, hex, and URLs
Live Base64, hex, and URL encoding with UTF-8 byte counts.
Launch toolConvert between CSV, JSON, and tables
Convert CSV, TSV, JSON, Markdown tables, and SQL INSERTs with delimiter sniffing.
Launch toolCompare two JSON documents
Structural JSON diff — added, removed, changed, and type-changed values with JSON-path locations, ignoring key order.
Launch toolConvert between YAML, JSON, and TOML
Convert configuration files across YAML, JSON, and TOML with bidirectional formatting, type-loss warnings, and syntax error localization.
Launch toolText & Pattern Matching
Regular expression workbench, text diffing, and keyword density inspection.
Compare two pieces of text
Side-by-side line diff with unified patch export.
Launch toolCheck keyword density in your text
1/2/3-gram density, stop-word filter, and Flesch / Gunning Fog scores.
Launch toolTest and explain regular expressions
Test regular expressions live, view numbered and named capture groups, inspect plain-English token breakdowns, and run replacements.
Launch toolNetworking & DNS
IPv4 subnetting, DNS/MX lookup, reverse IP geolookup, and redirect hops.
Trace a redirect chain
Trace 301/302/307/308 chains, protocol upgrades, and hop latency.
Launch toolDNS & MX Record Lookup
Resolve A, AAAA, MX, TXT, CNAME, NS, SOA, and CAA with SPF/DMARC lint.
Launch toolLook up an IP address
Client IP, reverse PTR, ASN, and geo coordinates for any public address.
Launch toolCalculate an IPv4 subnet
Network, broadcast, usable host range, and subnet splitting from an IP and CIDR.
Launch toolScheduling & Automation
Crontab generation, cron expression breakdown, and Unix timestamp epoch conversion.
Explain a cron schedule in plain English
Explain 5-field cron in English and list upcoming fire times.
Launch toolConvert a Unix timestamp
Unix timestamp to date, with auto-detected seconds/milliseconds, UTC and local time, and ISO 8601 output.
Launch toolGenerate and edit crontab schedules
Generate standard 5-field cron schedules with a guided visual builder or direct expression editor, complete with plain-English summaries and the next 8 simulated fire dates.
Launch toolSEO & Web Audit
Open Graph cards, robots & sitemaps, indexing checks, and tech stack detection.
Preview how a link looks when shared
Audit og:*, Twitter cards, and character budgets from a URL or pasted HTML.
Launch toolCheck a site's robots.txt and sitemap
Parse robots.txt, test paths, and expand XML sitemap URL lists.
Launch toolCheck if a page can be indexed
Check noindex, nofollow, canonical consistency, and Googlebot hints.
Launch toolFind out what a website is built with
Fingerprint CMS, frameworks, CDNs, and analytics from HTML and headers.
Launch toolAudit a site for SEO and AI search readiness
One-shot crawlability, schema, and AI-citation readiness audit from a URL.
Launch toolCrawl a website and list its pages
Spider a domain, extract titles and H1s, and export a page dataset.
Launch toolExtract structured data from any webpage
Pull JSON-LD / microdata and synthesize TypeScript and Pydantic contracts.
Launch toolAI & Prompt Engineering
System prompt optimization, LLM token pricing, and RAG chunk simulation.
AI System Prompt Studio
Engineer, audit, and auto-architect developer-grade system prompts with Grok.
Launch toolRAG Chunking & Retrieval Studio
Simulate chunking strategies, sliding overlaps, retrieval ranking, and embedding cost.
Launch toolMath & Practice
Percentage calculation engines and in-browser DSA coding sandbox.
Practice coding problems online
Isolated Web Worker JavaScript judge with 3s execution timeout for DSA drills.
Launch toolCalculate a percentage
Percent of a value, percent change, reverse percentage, and percentage-point difference in one tool.
Launch tool