Precise tools for the AI engineer.
Twelve sharp utilities for the AI engineer: token counting, cost math, prompt scaffolds, format utilities. Every tool runs in your browser. Your prompts never leave this tab.
AI Tools
SECTION 01/03 · 5 TOOLSToken Counter
Count tokens for GPT-5, Claude, Gemini, Grok & 30+ LLMs. Real tokenizer ratios.
LLM Cost Calculator
Compare API costs across 40+ models from 7 providers. April 2026 verified pricing.
AI Model Comparison
Compare 40+ models side-by-side: pricing, context, speed, vision & reasoning.
AI Prompt Generator
Generate optimized prompts for any LLM with tone & format controls.
System Prompt Builder
Build structured system prompts with role, rules & output format.
Dev Tools
SECTION 02/03 · 5 TOOLSJSON Formatter
Format, validate & minify JSON data. Error detection included.
Base64 Encoder/Decoder
Encode & decode Base64 strings instantly.
UUID Generator
Generate UUID v4 identifiers in bulk.
Epoch Converter
Convert Unix timestamps to dates and back.
Cron Expression Generator
Build cron expressions visually with presets.