Tools

Free tools

Small, fast tools that run in your browser. No sign-up, nothing uploaded.

01

All tools⁽⁶⁾

Screenshot mockup
Images
Turn raw screenshots into polished product visuals, exported as PNG or JPG.
LLM token & cost calculator
AI
Count tokens in a prompt and compare the cost across Claude, GPT and Gemini models.
Prompt template playground
AI
Write prompts with {{variables}}, fill them in and copy plain text or API-ready messages.
Tool schema converter
AI
Convert a JSON Schema into an Anthropic tool or OpenAI function definition, and back.
Diff checker
Developer
Compare two pieces of text or code side by side, by line, word or character.
Mermaid diagram previewer
Developer
Write Mermaid code, preview the diagram live and export it as SVG or PNG.
Next up
More tools are on the way: JSON formatter, JWT decoder, colour converter.