Free AI & Developer Tools
No-code tools for developers, SEO professionals, and content creators. Built by Effloow — try them instantly, no signup required.
JSON to TypeScript, Pydantic, Zod & JSON Schema Generator
Paste JSON to generate TypeScript interfaces, Pydantic v2 models, Zod schemas, and JSON Schema. Ideal for typing LLM structured outputs. 100% client-side.
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Claude Model Migration Scanner — Find Retired Model IDs
Scan code, config, and .env for retired Claude/Anthropic model IDs and API parameters that break after model retirement. Dated checklist, client-side.
JSON to TypeScript, Pydantic, Zod & JSON Schema Generator
Paste JSON to generate TypeScript interfaces, Pydantic v2 models, Zod schemas, and JSON Schema. Ideal for typing LLM structured outputs. 100% client-side.
LLM Cost Calculator — API vs Self-Hosting Break-Even
Free calculator: compare the monthly cost of an LLM API against self-hosting on your own GPU, and find the token volume where self-hosting starts to win.
LLM VRAM Calculator — GPU Memory for Inference, LoRA & Fine-Tuning
Free calculator: estimate the GPU VRAM needed to run or fine-tune any LLM. Choose model size, precision, and mode (inference, LoRA, QLoRA, full fine-tune).
HTTP Status Code Reference — Complete Explorer & Quick Lookup
Look up any HTTP status code. Search by number or name, filter by category (1xx-5xx), and read descriptions, use cases, and developer notes.
Color Converter — HEX, RGB, HSL, CMYK Free Online Tool
Convert colors between HEX, RGB, RGBA, HSL, HSLA, and CMYK instantly. Visual preview, tints & shades, color harmonies, and one-click CSS copy. 100% client-side.
URL Encoder/Decoder — Percent-Encode URLs Online
Encode and decode URLs instantly. Full URL and component encoding for query parameters, path segments, and special characters. 100% client-side.
Unix Timestamp Converter — Epoch Time to Human-Readable Date
Convert Unix timestamps to readable dates and back. See current epoch, timezone conversions, ISO 8601, and relative time. 100% client-side.
Cron Expression Parser — Decode Cron Schedules Instantly
Parse cron expressions online. Get human-readable descriptions and preview the next 10 run times. Supports 5-part and 6-part (with seconds) syntax.
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.
JWT Decoder — Inspect JSON Web Tokens Instantly
Decode and inspect JWT tokens online. View header, payload, and claims, and check expiration, algorithm, and issuer. Client-side, privacy-first.
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.
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.
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.
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.
Vibe Coding Tool Picker — Find Your Perfect AI Code Generator
Interactive quiz to find the best vibe coding tool for your project. Compare Cursor, Lovable, Bolt.new, Replit, v0, and Windsurf on pricing and features.
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.
SEO Tools
Content Tools
Article Word Count & Reading Time Calculator — Free Text Analysis Tool
Free word counter and reading time estimator. Instant word, character, sentence, and paragraph counts plus Flesch reading ease score for any text.
Newsletter Revenue & Valuation Calculator — Estimate Your Worth
Free calculator estimating your newsletter's sponsorship, paid subscription, and affiliate revenue, plus market valuation, from subscriber metrics.
Analytics Tools
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.
AI Model Comparison Tool — Claude vs GPT vs Gemini Feature Matrix
Compare AI models side-by-side: pricing, context windows, multimodal support, and speed. Interactive matrix for Claude, GPT, Gemini, Llama, and more.
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