Free, private developer tools with zero accounts
Small, focused utilities that run entirely in your local browser. No data leaves your machine, no tracking, no rate limits, and no accounts required.
Client-Side Utilities
Developer Roadmap Generator
Pick a goal, your level and your weekly hours, and get a dated week-by-week plan built from free learning paths, with real video links and milestones.
DSA Sheet Tracker
Track Blind 75 and NeetCode 150 problem by problem, flag what needs revision, and see progress per topic. Saved in your browser, no account.
JSON Formatter & Validator
Beautify, minify, and validate JSON payloads with native parser error diagnostics. Your data never leaves your browser.
LLM Token Counter
Estimate token counts across GPT-4o, Claude 3.5, Llama 3, and Gemini before dispatching prompts to model APIs.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time live as you type, with social media length indicators.
JSONL Validator & Viewer
Validate newline-delimited JSON line by line, preview valid rows as a table, and detect common fine-tuning dataset schemas.
LLM API Cost Calculator
Estimate model API spend per call, per 1K, per 1M and per month across GPT, Claude, Gemini, Llama and DeepSeek with the math shown.
JSON to TypeScript, Zod & Pydantic
Turn a JSON sample into TypeScript interfaces, Zod schemas, or Python Pydantic models with nested types, arrays and nullable fields.
PX to REM Converter
Convert px to rem and back against a configurable base font size, with a reference table and copy buttons for common values.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML in both directions with a one-click swap, two-space output and inline parse errors.
Cron Expression Generator
Build a five-field crontab schedule from presets, read it in plain English, and preview the next five run times in your local timezone.
Open Graph & Meta Tag Previewer
Preview a link as it would appear on Google, Facebook, LinkedIn, X and Slack, then copy a ready-to-paste meta tag block.
Case Converter
Convert text to camelCase, snake_case, kebab-case, Title Case, a URL slug and more at once, with per-row copy.
Secret & API Key Scanner
Scan pasted code, config or logs for exposed provider keys, tokens, private keys and hardcoded credentials. No telemetry.
Unix Timestamp Converter
Convert epoch values to human dates and back with unit auto-detection, timezone selection, ISO 8601, RFC 2822 and relative time.
Chat Messages Array Builder
Compose an LLM conversation turn by turn and export it as OpenAI JSON, Anthropic messages, a Python SDK call, or curl.
AI Developer Tools
Free AI Code Generator
Transform plain English problem descriptions into clean, production-ready code snippets across modern programming languages.
AI Project Generator
Convert rough software concepts into structured project briefs, database schemas, and step-by-step implementation milestones.
AI API Documentation Generator
Generate structured OpenAPI/Swagger and markdown documentation directly from backend endpoints and code files.
Explore All AI Tools
Browse our complete collection of 8+ dedicated AI productivity tools for developers and engineers.
Why our utilities run 100% in your browser
Zero Server Uploads
Most online formatters post your text to a server. Here, your JSON, prompt tokens, and confidential drafts never leave your local RAM.
Safe for API Keys & NDAs
Paste server configs, proprietary schemas, and API tokens with confidence. Nothing is logged, cached, or transmitted across a wire.
Offline Ready
Once the page is loaded, you can disconnect your internet and every single client-side utility continues functioning instantly.