Free AI & Developer Tools

Unix Timestamp Converter — Epoch Time to Human-Readable Date

Convert Unix timestamps to human-readable dates and back. See current epoch time, timezone conversions, ISO 8601, and relative time. 100% client-side, no data sent anywhere.

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Interactive

Cron Expression Parser — Decode Cron Schedules Instantly

Parse and understand cron expressions online. Get human-readable descriptions and preview the next 10 run times. Supports 5-part and 6-part (with seconds) cron syntax.

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Interactive

Regex Tester — Test Regular Expressions Online

Test and debug regular expressions in real time. Highlight matches, view capture groups, and use common patterns. 100% client-side, no data sent anywhere.

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Interactive

JWT Decoder — Inspect JSON Web Tokens Instantly

Decode and inspect JWT tokens online. View header, payload, and claims in a readable format. Check expiration, algorithm, and issuer. 100% client-side, privacy-first.

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Interactive

Free Base64 Encoder & Decoder Online | Effloow

Encode text to Base64 or decode Base64 to text instantly. Supports file upload, URL-safe variant, and copy to clipboard. 100% client-side.

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Interactive

Developer Utilities Hub — UUID, Timestamp & Hash Generator

Generate UUIDs (v1/v4/v7), convert Unix timestamps, create hashes (MD5/SHA-256/SHA-512). Bulk generation, CSV/JSON export. 100% client-side.

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Interactive

Diff Checker — Free Online Text & Code Compare Tool

Compare text and code side-by-side or inline. Word-level highlighting, JSON semantic diff, file upload. 100% client-side — your data never leaves your browser.

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Interactive

JSON Formatter & Validator — Free Online JSON Tool

Format, validate, and minify JSON instantly. Syntax highlighting, tree view, error detection with line numbers, and configurable indentation. 100% client-side.

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Interactive

Vibe Coding Tool Picker — Find Your Perfect AI Code Generator

Take the interactive quiz to find the best vibe coding tool for your project. Compare Cursor, Lovable, Bolt.new, Replit, v0, Windsurf and more — pricing, features, and use cases side-by-side.

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Interactive

twMerge Playground — Tailwind CSS Class Conflict Debugger

Interactively debug Tailwind CSS class conflicts. See which classes get removed by tailwind-merge and why, with live visual output.

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AI Crawler Control Panel — Block AI Bots with a Visual robots.txt Generator

Generate robots.txt rules, meta tags, and HTTP headers to block AI crawlers like GPTBot, ClaudeBot, and PerplexityBot. Visual toggles, one-click presets, and deploy-ready output.

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Interactive

Article Word Count & Reading Time Calculator — Free Text Analysis Tool

Free word counter and reading time estimator. Get instant word count, character count, sentence count, paragraph count, reading time, and Flesch reading ease score for any text.

#tool #writing

Interactive

Newsletter Revenue & Valuation Calculator — Estimate Your Newsletter's Worth

Free calculator to estimate your newsletter's sponsorship revenue, paid subscription potential, affiliate income, and market valuation based on subscriber metrics and industry benchmarks.

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Interactive

AI Token Estimator — Count Tokens for Claude, GPT-4, Gemini

Estimate token counts and API costs for your prompts across Claude, GPT-4o, and Gemini models. Real-time, client-side, no data sent to servers.

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Interactive

AI Model Comparison Tool — Claude vs GPT vs Gemini Feature Matrix

Compare AI models side-by-side: pricing, context windows, multimodal support, speed, and capabilities. Interactive feature matrix for Claude, GPT, Gemini, Llama, and more.

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Interactive