AI & LLM Tools — Token Count, Pricing & Context

Browser-local utilities for LLM developers: count tokens, estimate API costs, and check context-window fit. Also useful: word-counter, json-formatter, and character-counter.

Count tokens before calling OpenAI, Anthropic, or Google APIs.
Estimate run cost from input/output token counts.
Check whether a prompt fits a model context window.

Back to AI tools on the hub

LLM token counter

Count tokens locally with exact tiktoken for OpenAI models.

LLM pricing calculator

Estimate API cost from token counts (coming soon).

Context window calculator

See prompt usage vs each model context limit (coming soon).

Guides

Web Performance Checklist 2026: Guide to a Fast Website

The complete checklist to optimize your website performance in 2026. Minification, compression, images, caching, Core Web Vitals and more.

Optimize REST API Performance with JSON Minification

Speed up your REST APIs by optimizing JSON payloads. Minification, compression, pagination and best practices for ultra-fast APIs.