Developer Utilities
A curated suite of privacy-first, client-side tools designed specifically for AI developers, prompt engineers, and creators. No signup required.
Instantly count tokens for OpenAI, Anthropic, and open-source models, and estimate API costs.
Instantly structure your prompts with XML tags optimized for Claude and Anthropic models.
Check exact context limits for GPT-5.6, Claude 5, Llama 4, and hundreds of OpenRouter models dynamically.
Compare any LLM side-by-side using real-time OpenRouter stats, context limits, and token pricing.
Format, validate, and beautify messy JSON payloads, specifically tuned for fixing LLM outputs.
Translate YAML configurations into JSON and vice-versa. Free online developer utility.
Transform tabular CSV data into JSON arrays. Great for marketers and data engineers.
Validate a JSON payload against a strict JSON Schema definition visually.
Translate cryptic cron syntax into human-readable English instantly. Visualize execution dates and structure.
Instantly convert Unix timestamps (epoch) to human-readable dates in local and UTC time, and vice-versa.
Quickly generate standard .gitignore files by selecting your framework, language, and IDE.
Instantly translate a messy docker run terminal command into a clean docker-compose.yml file.
Visual Linux file permissions calculator. Convert between symbolic and numeric notations.
Generate perfectly formatted connection URIs for PostgreSQL, MongoDB, Redis, and more.
Build, test, and debug regular expressions in real-time. Features live match highlighting and capture group extraction.
Write, preview, and convert Markdown to HTML in real-time. Features GitHub Flavored Markdown (GFM) and raw HTML export.
Instantly convert raw cURL commands into JavaScript fetch(), Axios, or Python requests code.
Format, beautify, and align your messy SQL queries. Supports PostgreSQL, MySQL, and standard SQL dialects.
Visually compare two blocks of text or code to highlight exact additions and deletions.
A fast, privacy-first Base64 encoder and decoder. Your data never leaves your browser.
Instantly decode, verify, and format JSON Web Tokens (JWT). Inspect header, payload claims, and signatures securely.
Generate, salt, and verify bcrypt hashes instantly. Features adjustable salt rounds and strict security validation.
Instantly generate cryptographically secure UUIDs. Supports versions 1, 3, 4, 5 and bulk generation.
Generate cryptographically secure passwords or memorable Diceware passphrases natively in your browser.
Build and validate robust HTTP CSP headers visually without memorizing the syntax.
A marketing and SEO utility to generate valid robots.txt files for website crawling rules.
Generate and preview standard HTML meta tags and OpenGraph tags for perfect social media sharing.
Generate complex CSS box shadows visually. Supports multiple layers, inset shadows, opacity, spread, and real-time live preview.
Generate tiny, base64-encoded SVG data URIs for image placeholders in web design.
Visually design complex layouts and generate the corresponding Tailwind CSS utility classes.
Check if your background and foreground colors pass WCAG accessibility standards (AA/AAA).