AI & LLM Utilities
Free online AI and LLM tools. Count tokens, calculate API pricing, build prompts, compare models — all in your browser.
AI Model Comparison Table
Free interactive AI model comparison table. Compare context windows, pricing, benchmarks, and speeds across GPT-5, …
AI Pricing Calculator
Free online AI pricing calculator. Calculate API costs for GPT-5, Claude, Gemini, and more. Compare pricing across all …
AI Token Counter
Free online AI token counter. Estimate token counts for GPT-5, Claude, Gemini, Llama and more. Calculate API costs …
Chunking Preview Tool
Free online text chunking tool for RAG pipelines. Split text by tokens, sentences, or paragraphs with overlap. Visualize …
JSON Schema Generator for Function Calling
Free online JSON schema generator for AI function calling. Build tool schemas for OpenAI and Claude APIs with a visual …
Prompt Diff / A/B Viewer
Free online prompt diff tool. Compare two prompts side by side with highlighted differences. Track prompt iterations and …
Prompt Template Library
Free curated prompt templates for developers. Copy-paste prompts for coding, debugging, writing, analysis, and more. …
Structured Output Tester
Free online structured output tester. Validate JSON schemas, generate example responses, and create TypeScript types for …
System Prompt Builder
Free online system prompt builder. Create structured system prompts for ChatGPT, Claude, and other LLMs with a visual …
Text Similarity Analyzer
Free online text similarity analyzer. Compare two texts using TF-IDF and cosine similarity. Visualize shared terms and …