maratoolAI tools
AI tools that run locally in your browser.
AI Context Window Calculator
See how much of a model context window your text uses. Compare GPT-4o, Claude, and Gemini token limits.
Prompt Variable Tester — Template Preview
Test prompt templates with variables. Enter {{placeholders}} and preview the filled prompt instantly.
AI Embedding Cost Calculator
Estimate embedding API costs for OpenAI, Cohere, and Voyage. Enter token count and see per-request pricing.
RAG Chunk Calculator — Vector Chunk Size
Calculate RAG chunk count from token total, chunk size, and overlap. Plan vector indexing splits in your browser.
AI Model Cost Comparison
Compare LLM API costs across OpenAI, Claude, and Gemini for the same token counts. Free browser calculator.
Extract JSON from LLM Output
Extract JSON from LLM responses. Parse fenced code blocks and inline objects from pasted model output.
Vision Image Token Estimator
Vision Image Token Estimator. Free, instant, runs in your browser.
JSON Schema Generator from JSON
JSON Schema Generator from JSON. Free, instant, runs in your browser.
Clean Up Markdown Text Online
Clean Up Markdown Text Online. Free, instant, runs in your browser.
Compare Two Prompts — Prompt Diff
Compare Two Prompts — Prompt Diff. Free, instant, runs in your browser.
Compare Prompt Versions
Compare Prompt Versions. Free, instant, runs in your browser.
Format AI Output — JSON & Markdown
Format AI Output — JSON & Markdown. Free, instant, runs in your browser.