AI Developer Tools
Free AI-powered developer tools: fill in prompt templates, count tokens and estimate API cost for GPT, Claude, and Gemini, and get AI explanations for code, SQL, and error messages. Some tools send your input to an AI API to work — see each tool's description and our Privacy Policy for details.
5 tools in AI
AI Code Explainer
Paste any code snippet and get a plain-English explanation instantly, powered by AI. Free tool for understanding unfamiliar code in any language.
AI Error Message Explainer
Paste any error message or stack trace and get a plain-English diagnosis with a suggested fix, powered by AI. Free, no sign-up.
AI Text-to-SQL Generator
Describe the query you need in plain English and get a ready-to-use SQL statement, powered by AI. Free tool with dialect support.
Prompt Template Filler
Fill in {{variables}} in any AI prompt template instantly online, for free. Open the resolved prompt directly in ChatGPT with one click.
Token Counter & Estimator
Count tokens and estimate API cost for GPT, Claude, and Gemini models online, instantly. Free token counter using OpenAI's real tiktoken tokenizer.