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The full toolbox.

23 free developer tools, grouped by what they do. Every one runs entirely in your browser, so nothing you paste is uploaded.

AI

token counterNew

Count tokens with the real OpenAI tokenizers.

context window viz

See what fills a model's context budget.

context budget analyzerNew

Find which files eat your context window.

structured output builder

Schemas for OpenAI, Anthropic, Gemini & JSON Schema.

ai pattern explorer

Compare agent design patterns side by side.

rag chunking visualizerNew

See how a document splits into RAG chunks.

mcp config generatorNew

Build & validate an MCP server config.

prompt linterNew

Catch vague, conflicting, or unclear prompts.

llm vram calculatorNew

Estimate VRAM to run a model locally.

llm cost calculatorNew

Estimate API cost from token usage.

JSON

json → typescript

Paste JSON, get a typed TS interface.

json → go

Generate Go structs from any JSON payload.

Encoding

jwt decoder

Decode & inspect JSON Web Tokens.

base64 encode/decode

Encode or decode Base64, incl. URL-safe.

Converters

csv ⇄ json

Convert tabular data both ways, instantly.

.htaccess gen

Redirects & rewrite rules, the easy way.

curl → code

Turn a cURL command into fetch, axios, or Python.

yaml ⇄ json

Swap between YAML and JSON cleanly.

Text

sql formatter

Beautify and standardize messy SQL.

case converter

camelCase, snake_case, kebab, PascalCase.

Time & Cron

cron generator

Build & read crontab expressions, in plain English.

Feeds

rss validator

Check any feed against the spec.

opml converter

Import, view & convert OPML subscription lists.