Free AI Tools: Prompt Generators & Calculators
Small, fast tools for people who work with AI models. Each one runs entirely in your browser: nothing you type is uploaded, and none of them asks for an account.
FreeNo signupRuns in your browser
Prompt generators and converters
Prompt Weight ConverterTranslate (word:1.2), [word], word+ and {word} between A1111, ComfyUI, InvokeAI and NovelAI.
AI Image Prompt GeneratorBuild an image prompt as natural language or tags with quality prefixes for your model.
Negative Prompt GeneratorBuild a negative prompt around your model family, image type and visible defects.
AI Image Resolution CalculatorCalculate rounded image dimensions, real megapixels and the nearest SDXL training size.
Midjourney Prompt GeneratorAssemble a Midjourney prompt with ordered parameters and an optional Discord prefix.
AI Video Prompt GeneratorBuild one video shot with a clear action, camera move, sound cues and dialogue.
JSON Prompt GeneratorTurn an idea into a valid, structured JSON prompt for image, video or chat models.
System Prompt GeneratorBuild standing instructions with a role, context, tasks, rules, tone and response format.
AI Prompt GeneratorTurn a rough request into a structured chat prompt using a free template engine, with no AI calls.
AI Text CleanerStrip hidden characters, Markdown marks, em dashes and smart quotes from AI-written text.
Model, pricing and hardware tools
Which LLM Should I Use?Answer four questions, get a concrete model recommendation.
LLM API Pricing CalculatorLive per-token prices for 300+ models and a monthly cost estimate.
LLM VRAM CalculatorCheck whether your GPU can run a local model, and at which quantization.
Cloud GPU PricingHourly prices for AI-capable GPUs across providers.
MCP Server DirectoryCurated Model Context Protocol servers with install commands.
AI Model Releases TimelineEvery major model launch, newest first.
Use these from an AI agent
Assistants can call the calculators and the live data directly. Add the MCP server https://www.promptzone.com/mcp to any client that supports the Model Context Protocol (Streamable HTTP, no sign-in), or call the same tools over plain HTTP: the tool list gives each tool's JSON Schema and URL. Every result names the page it came from.
Looking for finished prompts rather than a builder? The prompt directory is free and every prompt is ready to paste.
Browse free copy-ready prompts →
