Developer Tools
Free, private, runs in your browser
SQL formatting and schema tools, Git and regex references, Docker conversion, Mermaid viewer, image compression, and Markdown editor.
Git Cheat Sheet
Quick reference for common Git commands.
Crontab Generator
Generate cron expressions with a visual builder.
SQL Formatter
Format and beautify SQL queries.
SQL to ER Diagram
Convert CREATE TABLE SQL into interactive ER diagrams with relationship mapping.
SQL Query Plan
Visualize SQL execution plans and get optimization tips.
SQL Dialect Converter
Convert SQL between PostgreSQL, MySQL, SQLite, T-SQL, BigQuery, and more.
Foreign Key Visualizer
Map foreign key relationships and find orphaned tables in your schema.
SQLite Browser
Open, query, and edit SQLite databases in your browser. Browse tables, run SQL, edit cells, import CSV, export .db files. WebAssembly, no upload.
Chmod Calculator
Calculate Unix file permissions.
Docker to Compose
Convert docker run commands to docker-compose.
Regex Tester
Test and debug regular expressions.
Text Encoding Playground
Convert text to Unicode escapes, NATO phonetic alphabet and numeronyms, plus ASCII art. One tabbed playground, client-side.
Quick Utilities
SVG placeholders, WiFi QR codes, camera recording, chronometer, emoji picker and keycode info in one page.
Mermaid Diagram Viewer
Render Mermaid diagrams in real-time. Flowcharts, sequence diagrams, class diagrams, gantt charts, and more.
Performance Benchmark
benchmark-builder - free, privacy-first, and 100% client-side.
BPMN Viewer
Visualize BPMN 2.0 diagrams and export them as PDF. Free, privacy-first BPMN viewer that runs entirely in your browser.
Visio Viewer
Open and view Microsoft Visio .vsdx files in your browser — no Visio install, no upload. Multi-page rendering, zoom, and SVG export.
BPMN to Visio
Convert BPMN 2.0 diagrams to Visio (.vdx) with live preview and exact BPMN DI layout preservation. Drag-drop, layered auto-layout fallback, conversion summary. Client-side.
Html Wysiwyg Editor
html-wysiwyg-editor - free, privacy-first, and 100% client-side.
Markdown Editor
Edit and preview Markdown files in real-time.
Markdown to HTML Converter
Convert Markdown to HTML with syntax highlighting.
Text Diff Checker
Compare two texts and see differences.
Text Statistics
Count characters, words, sentences, and paragraphs.
Image Compressor
Compress and optimize images.
Agent Identity Generator
Instantly generate unique personas, traits, and system prompts for AI agents.
PII Redactor
Scan and remove personal data (emails, phones, SSNs, API keys) before sending to any AI model. Client-side.
OpenAI API Request Builder
Build chat/completions requests visually — model, messages, parameters. Generates curl, Python, and JavaScript code.
Context Window Splitter
Chunk long text for RAG by tokens, sentences, or paragraphs. Shows overlap and context usage per chunk.
Prompt Template Renderer
Auto-generate a form from {{variables}} in your prompt template. Fill values, get the rendered prompt with token count.
LLM JSON Validator
Extract and validate JSON from any AI model output — handles markdown fences, prose, trailing commas, smart quotes.
Jev Playground
Build Jev (TypeSafe System One) requests visually: state plus Noul, Choice, and Score questions. Mock responses with probability distributions, Python SDK code generation. Free, client-side, no API key.
Jev Suitability Test
Is your task Jev-shaped? Six criteria from System One guidance: judgement, bounded, atomic, context-contained, fast-human, machine-consumed — scored with a verdict and decomposition advice.
LLM Token Counter
Count tokens for GPT-4o, GPT-4, o1, and legacy models locally. Compare across tokenizers, estimate API costs. No API calls.
elizaOS Character Validator
Validate your elizaOS character.json against the real schema: missing required fields, type errors, empty bio or style, malformed messageExamples, and leaked secrets. Free, client-side.
.env Hygiene Checker
Client-side scan of agent .env files: duplicate keys, empty values, quote and whitespace issues, and known elizaOS variable names. Nothing is ever uploaded.
elizaOS Plugin Manifest Linter
Lint your plugin package.json against the elizaOS registry conventions: plugin- name prefix, elizaos keywords, dual-format build fields and registry assets. Free, client-side.
Meta Tag Generator
Generate HTML meta tags for SEO.