AI Token Tools is a free suite of practical developer utilities designed to make working with AI language model APIs faster and more informed. Everything runs in your browser — no accounts, no servers, no data collection.
Every developer working with AI APIs faces the same friction: you need to know how many tokens your prompt uses before you can estimate costs, but most tokenizer libraries require a local install or an API call just to get a count. You need to compare model prices across providers, but each has a different pricing page with different table formats. You need to write an effective system prompt, but the right format differs between Claude, GPT-4o, and Gemini.
AI Token Tools was built to solve these specific, practical problems in one place. The tools are intentionally minimal — no dashboards, no account management, no features you don't need. Just fast, accurate utility tools that answer the questions developers ask every day.
Count tokens in any text for GPT-4o, Claude, and Gemini models using BPE approximation. See character count, word count, and an estimated input cost — all in real time as you type.
Enter your token counts and monthly request volume to see exact API costs across 11 models, ranked from cheapest to most expensive. Essential before you scale a workload.
Side-by-side specs for every major LLM: context window, input/output pricing, and key capabilities. Sortable and filterable by provider and budget.
Build structured system prompts visually, formatted correctly for Claude (XML tags), GPT-4o (Markdown), or Gemini (prose). Start from four professional templates.
AI Token Tools is designed for:
AI Token Tools is built with plain HTML, CSS, and Alpine.js — no heavy frameworks, no build pipeline, no server infrastructure. All tool logic runs entirely client-side. The site is hosted on Cloudflare Pages and served from edge locations worldwide for fast load times regardless of where you are.
Model pricing data is manually maintained and updated when providers announce price changes. We aim to update within 24 hours of any change. Token counts use a BPE approximation algorithm calibrated against cl100k_base, the tokenizer used by GPT-4o and Claude models.
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All tools are free, instant, and require no signup.