Tools.
Practical tools built from real engagement patterns. Open, instant, no signup required.
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YAML ↔ JSON Converter
Convert between YAML and JSON instantly — bidirectional, client-side, with syntax validation.
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Word Counter & Reading Time
Count words, characters, and sentences in real time — plus reading time, speaking time, and keyword density.
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UUID Generator
Generate cryptographically random v4 UUIDs in bulk — all client-side.
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URL Encode/Decode
Encode and decode URLs and URI components instantly — all client-side.
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Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates — all client-side.
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Unit Converter
Convert between units of length, weight, temperature, data size, time, and more — all client-side.
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TOTP Code Generator
Generate time-based one-time passwords from a secret key — runs entirely in your browser.
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Tool Index & Search
Search and browse all 100 tools with categories, descriptions, and direct links.
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Token Counter
Estimate token counts for GPT-4, GPT-3.5, and Claude 3 models. See character count, word count, and per-model token estimates in real time.
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Tip Calculator
Calculate tip amounts and split bills evenly among any number of people.
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Timezone Converter
Compare times across multiple timezones at a glance — with business hours highlighting and common region presets.
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Tech Stack Visualizer
Select your tech stack components and generate a shareable visual diagram.
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Tailwind CSS Class Lookup
Search Tailwind CSS utility classes instantly — see what each class does with live CSS output and visual previews.
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System Prompt Linter
Paste a system prompt and get instant feedback on anti-patterns, vague language, missing structure, and an overall quality score.
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SVG Path Editor
Draw and edit SVG paths visually — drag control points, see commands in real time, and export clean SVG code.
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Subresource Integrity Hash
Generate SRI hashes for scripts and stylesheets to protect against CDN tampering.
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Subnet Calculator
Parse CIDR notation and instantly see network address, broadcast, netmask, usable host range, and IP class.
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Standup Note Generator
Build structured standup notes and export them as plain text, Markdown, or Slack-formatted messages.
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SSL Certificate Decoder
Paste a PEM-encoded certificate and instantly view subject, issuer, validity, SANs, and key details.
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SSH Key Generator
Generate Ed25519 or RSA key pairs entirely in the browser — nothing leaves your machine.
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SQL Formatter
Pretty-print and format SQL queries with syntax highlighting — all client-side.
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Sprint Velocity Calculator
Track sprint velocity, visualize trends, and forecast delivery timelines with confidence ranges.
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Slug Generator
Convert any text into URL slugs, filenames, CSS classes, camelCase, and snake_case in real time.
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Sitemap XML Generator
Generate a valid XML sitemap with per-URL priority, changefreq, and lastmod settings.
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SaaS Unit Economics Dashboard
Input your key SaaS metrics and get a one-page unit economics snapshot with health indicators and actionable benchmarks.
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Runway Calculator
Enter your cash on hand, monthly revenue, and expenses to calculate your startup's runway, burn rate, and zero-cash date.
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Robots.txt Generator
Build a robots.txt file with user-agent rules, presets for AI bots, sitemap URL, and crawl-delay.
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Retro Board
Run sprint retrospectives with draggable cards, voting, and markdown export. Organize feedback into What Went Well, What Didn't, and Action Items.
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Responsive Breakpoint Tester
Preview any URL at common viewport sizes — test mobile, tablet, and desktop breakpoints side by side.
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Regex Tester
Test regular expressions with real-time match highlighting and group capture display — all client-side.
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README Template Generator
Fill in project details and generate a well-structured README.md file.
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Readability Score Analyzer
Analyze text readability using Flesch, Gunning Fog, Coleman-Liau, and other industry-standard formulas.
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RAG Retrieval Debugger
Debug retrieval quality by scoring text chunks against a query using BM25 and TF-IDF cosine similarity. See rankings, scores, and highlighted term matches.
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QR Code Generator
Generate QR codes from any text or URL — download as PNG, all client-side.
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Prompt Template Builder
Write prompt templates with {{variable}} placeholders, fill in each variable, and preview the rendered prompt ready to copy.
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Prompt A/B Tester
Draft, compare, and diff two prompts side by side. See character, word, and token counts, highlight differences, and export as JSON.
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Project Scope Estimator
Estimate project hours and costs using t-shirt sizing for each feature or task.
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Privacy Policy Generator
Answer a few questions about your site or app and get a basic privacy policy draft — free and instant.
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Pricing Page Grader
Score your SaaS pricing page against a 20-point checklist of conversion best practices used by top-performing companies.
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Pomodoro Timer
Stay focused with timed work sessions and breaks — 25 minutes on, 5 minutes off, with audio alerts and session tracking.
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Password Strength Meter
Estimate crack time with zxcvbn-style pattern analysis — checks dictionary words, sequences, and common patterns.
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Password Generator
Generate strong, random passwords with configurable length, character sets, and real-time entropy display.
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Open Graph Preview
Preview how your URLs will appear when shared on Facebook, Twitter, Discord, LinkedIn, and Slack.
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Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal — with live updates as you type.
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Nginx Config Generator
Build production-ready nginx server blocks with SSL, reverse proxy, PHP-FPM, and security headers.
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MRR / ARR Calculator
Input your subscription tiers and customer counts to instantly calculate MRR, ARR, and month-over-month growth rate.
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Mortgage Payment Calculator
Estimate monthly mortgage payments with principal, interest rate, and loan term.
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Model Context Window Comparison
Visual bar chart comparing context window sizes across GPT, Claude, Gemini, Llama, Mistral, and Cohere models. See what fits in each window.
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Meta Tag Generator
Generate Open Graph, Twitter Card, and SEO meta tags for any webpage instantly.
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Meeting Cost Calculator
Calculate the true cost of meetings based on attendees, hourly rates, and duration — including recurring meeting projections.
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Markdown to HTML Converter
Convert Markdown to HTML instantly with live preview — supports headings, tables, code blocks, and more.
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Markdown Table Generator
Build tables visually with a GUI editor and export clean Markdown — no syntax to remember.
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LTV:CAC Ratio Calculator
Calculate customer lifetime value vs. acquisition cost, see your LTV:CAC ratio, and benchmark against SaaS industry standards.
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Lorem Ipsum Generator
Generate placeholder text as paragraphs, sentences, or words — all client-side.
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Keyboard Shortcut Reference
Searchable database of keyboard shortcuts for VS Code, Vim, Mac OS, and Windows.
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JWT Decoder
Paste a JSON Web Token and instantly decode the header, payload, and signature — all client-side.
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JSON to CSV Converter
Paste a JSON array and flatten it into a downloadable CSV file — all client-side.
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JSON Schema Generator
Paste a JSON example and instantly generate a JSON Schema with inferred types, required fields, nested objects, and format detection.
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JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting — all client-side.
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Invoice Generator
Fill in your business details, add line items, and download a professional PDF invoice — no account needed, all client-side.
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Image to Base64 Encoder
Drop an image and get a ready-to-use data URI — all client-side, nothing uploaded.
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HTTP Status Code Reference
Searchable reference for every HTTP status code with descriptions, use cases, and quick copy.
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HTTP Header Analyzer
Paste HTTP response headers and get actionable security recommendations for hardening your site.
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Hourly Rate Calculator
Convert your desired annual salary into an hourly rate with overhead and profit margins.
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Headline Analyzer
Score and optimize headlines for engagement — analyzes length, power words, sentiment, and word balance.
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Hash Generator
Generate SHA-256, SHA-512, and MD5 hashes from any text input — all client-side.
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Gantt Chart Builder
Build interactive Gantt charts with tasks, dependencies, and timeline visualization. Add tasks with dates, draw dependency arrows, and export your project plan.
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Font Pairing Suggester
Pick a heading font and get expert body font pairings — preview them live with customizable sample text.
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Feature Prioritization Matrix
Score and rank features using ICE or RICE frameworks with a sortable, editable table. Add your features, score them, and see the priority order.
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Favicon Generator
Upload an image and generate all favicon sizes plus the HTML snippet you need — all client-side.
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Embedding Similarity Calculator
Compare two texts using TF-IDF cosine similarity. See the similarity score, common terms, and unique terms for each input.
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Email Subject Line Tester
Score your email subject lines on length, power words, personalization, urgency, spam triggers, and more.
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Docker Compose Validator
Paste your docker-compose.yml and validate services, ports, volumes, and structure against common mistakes.
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DNS Lookup
Query DNS records over HTTPS — A, AAAA, MX, TXT, CNAME, and NS — with TTL values and copy-friendly output.
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Diff Checker
Compare two texts side-by-side with color-highlighted line-by-line diff — all client-side.
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Decision Matrix
Compare options against weighted criteria to find the best choice with a clear, visual ranking.
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CSV to JSON Converter
Upload or paste CSV data and instantly convert it to JSON with automatic type inference — all client-side.
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CSS Grid Generator
Build CSS grid layouts visually — define columns, rows, gaps, and template areas, then copy the generated code.
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CSS Gradient Generator
Build linear, radial, and conic CSS gradients visually with color stops, angle controls, and instant code output.
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CSS Flexbox Playground
Configure CSS flexbox properties visually — see how flex containers and items behave with instant code output.
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CSP Header Builder
Build Content-Security-Policy headers interactively with directive explanations and live preview.
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Cron Expression Builder
Build, parse, and preview cron expressions with visual selectors, human-readable descriptions, and next-run previews.
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CORS Checker
Test and validate CORS headers against your expected configuration — paste headers and verify policies.
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Conversion Rate Calculator
Track your marketing funnel from visitors to trials to paid customers with conversion rates, cost analysis, and a visual funnel.
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Contrast Ratio Checker
Check WCAG contrast ratios for text and background color combinations — see AA and AAA compliance at a glance.
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Color Converter
Convert colors between HEX, RGB, and HSL with a live preview swatch — all client-side.
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Cloud Cost Estimator
Compare approximate monthly and yearly compute, storage, and transfer costs across AWS, GCP, and Azure.
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Churn Rate Calculator
Calculate customer and revenue churn rates, visualize retention trends, and benchmark against SaaS industry standards.
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Chunking Visualizer
Paste text and visualize how different chunking strategies split it. Compare fixed-size, sentence, paragraph, and recursive chunking with adjustable parameters.
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Changelog Generator
Paste conventional commits and generate a formatted changelog grouped by type.
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Business Name Generator
Generate creative business name ideas from your industry and keywords.
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Break-Even Calculator
Calculate your break-even point in units and revenue. See how fixed costs, variable costs, and price per unit affect profitability.
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Box Shadow Generator
Drag sliders to design box shadows visually and copy the CSS — supports multiple layers, inset, and spread.
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Blog Post Outline Builder
Generate structured blog post outlines with title variations, H2/H3 sections, intro, conclusion, and CTA.
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Base64 Encode/Decode
Encode and decode Base64 strings instantly — all client-side.
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AWS Region Latency Tester
Measure approximate round-trip time to every AWS region from your browser and find the closest one.
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Aspect Ratio Calculator
Calculate width and height for any aspect ratio — perfect for responsive images, video embeds, and design layouts.
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API Response Time Tester
Measure the response time of any public API endpoint from your browser.
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AI Cost Calculator
Estimate and compare API costs across GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and more. Calculate per-request, daily, monthly, and yearly spend.
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.env File Formatter
Sort, dedupe, lint, and clean your .env files. Catch unquoted values, duplicate keys, and exposed secrets.
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Technical Debt Interest Calculator
Tech debt compounds like financial debt. See exactly what you're paying in interest — and when it's cheaper to refactor.
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Square Texter
Type a word, see it rendered as a corner-square pattern. Instant, in-browser.