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Developer tools for the AI generation

17 precision instruments for token counting, pricing, context planning, and every encoding tool you need. In-browser, no signup.

Try Token Counter

Your AI workflow, measured and optimized.

Token Counter

See every token boundary

GPT, Claude, Gemini tokenizers side by side.

The quick brown fox jumps over

LLM Pricing

56 models, one comparison

Real-time pricing from all major providers.

Map your context window

System prompt, RAG, history — visualize allocation.

System 15%RAG 35%History 30%Free 20%

Prompt Builder

Assemble prompts, block by block

Structured multi-turn editor with variables.

system{ ... }

user{ ... }

assistant{ ... }

Browser-Native

From input to insight in zero round trips.

Every tool runs entirely in your browser. No server calls, no data leaves your machine.

ProcessingLocal only

Data uploaded0 bytes

Signup requiredNever

Tools available17

Every tool you need

JSON Formatter

Format & validate

JSON Diff

Compare structures

JSON → TypeScript

Generate interfaces

JSONPath

Query expressions

JSON Schema

Generate & validate

Base64

Encode & decode

Unicode Explorer

Inspect codepoints

Text Diff

Side-by-side compare

Regex Tester

Real-time patterns

String Inspector

Character analysis

cURL Converter

To fetch, axios

Image Compressor

Lossless & lossy

File Explorer

Inspect any file