The AI engineer's
utility belt.
Token counters, cost calculators, output cleaners, RAG prep — everything you need to ship with LLMs. Free, fast, and 100% client-side.
Your data never leaves your browser.
Anchor tools
The five most-used utilities — covering counting, cost, structure, and data prep.
Token Counter
Count tokens for GPT, Claude, and Gemini models — runs entirely in your browser.
Coming soonAPI Cost Calculator
Estimate the cost of any prompt or completion across major LLM providers.
Coming soonSystem Prompt Generator
Build battle-tested system prompts from role, tone, and constraint inputs.
Coming soonAI JSON Repairer
Fix malformed JSON output from any LLM — quotes, trailing commas, escaping, all of it.
Coming soonText Chunker
Split long documents into token-aware chunks for embeddings and RAG.
Coming soonBrowse by category
Six focused categories, fifty tools — every one built for the LLM workflow.
Tokens & Cost
10 tools
Count tokens, estimate API spend, and visualize context windows for GPT, Claude, and Gemini.
Prompt Builders
10 tools
Compose, structure, and refactor prompts with templates for system messages, few-shot examples, and chain-of-thought.
Output Cleaners
10 tools
Strip markdown, fix broken JSON, extract code blocks, and polish raw LLM responses for production use.
RAG & Data Prep
8 tools
Chunk text, deduplicate datasets, and convert files into formats ready for retrieval augmented generation and fine-tuning.
Model Reference
6 tools
Side-by-side comparisons of model context windows, speeds, capabilities, and pricing across vendors.
AI Creator Tools
6 tools
Utilities for AI image, video, and social content creators — aspect ratios, seeds, subtitles, and disclosure helpers.