AI & LLM Tools
Count tokens, estimate API costs, check context window limits and generate llms.txt. Practical utilities for anyone building on GPT, Claude or Gemini.
AI Token Counter
Estimate how many tokens your prompt will cost before you send it.
Open tool →LLM API Cost Calculator
Work out what your AI feature will cost per call and per month.
Open tool →Context Window Calculator
Check whether your document fits — and how much room is left to answer.
Open tool →llms.txt Generator
Publish a map of your site for AI crawlers and answer engines.
Open tool →JSON Schema Generator
Turn a sample JSON document into a validation schema.
Open tool →About AI & LLM Tools
Building on a language model means reasoning constantly about tokens: how many a prompt costs, whether a document fits the context window, what a month of traffic will bill. These tools answer those questions directly, without you having to wire up an SDK to find out.
Every tool in this category
- AI Token Counter — Estimate how many tokens your prompt will cost before you send it.
- LLM API Cost Calculator — Work out what your AI feature will cost per call and per month.
- Context Window Calculator — Check whether your document fits — and how much room is left to answer.
- llms.txt Generator — Publish a map of your site for AI crawlers and answer engines.
- JSON Schema Generator — Turn a sample JSON document into a validation schema.
Other tool categories
- Data Format Converters — Convert between JSON, YAML, CSV, XML and TypeScript in your browser. Every converter validates as you type and nothing is uploaded to a server.
- SEO & Web Tools — Generate robots.txt, meta tags, schema markup and UTM links, preview your SERP snippet and validate an XML sitemap. Technical SEO essentials, free.
- Text & String Tools — Compare two texts, test regular expressions, build URL slugs, convert case and count words and characters. Fast, private, browser-based text utilities.
- Encoding & Developer Tools — Base64, URL encoding, JWT decoding, hash generation and UUIDs. The small developer utilities you reach for several times a week, all client-side.
- Image & Asset Tools — Convert images to Base64 data URIs, inline SVGs, read EXIF metadata, generate favicons and extract colour palettes — all in the browser.