Developer tools for the two-minute problems, with AI built in.
Formatters, converters, token counters, and model calculators built for the gap between opening your terminal and finishing your coffee. No account, no clutter, nothing uploaded.
Pick a problem, get it solved.
19 developer tools, including a growing set of AI helpers. Each does exactly one job, instantly, in your browser.
JSON Formatter
Paste ugly JSON, get clean, validated, color-coded output.
→open toolConverterBase64 Encode / Decode
Text and file conversion, both directions, instantly.
→open toolGeneratorUUID / GUID Generator
Bulk-generate v4 UUIDs in any format you need.
→open toolNew · AIAI Token Cost Calculator
Estimate spend across Claude, GPT, and Gemini before you build.
→open toolCompareText Diff Checker
Side-by-side diff for code, config, or plain text.
→open toolNew · AIAI Disclosure Snippet
Generate compliant "AI-generated content" labels for your site.
→open toolDecoderJWT Decoder
Decode a JSON Web Token's header and payload, no secret needed.
→open toolGeneratorHash Generator
MD5, SHA-1, SHA-256, SHA-512 checksums from any text.
→open toolConverterURL Encode / Decode
Percent-encode text for URLs, or decode it back.
→open toolConverterUnix Timestamp Converter
Convert between Unix time and human dates, both ways.
→open toolTextCase Converter
camelCase, snake_case, kebab-case, Title Case, and more.
→open toolConverterColor Converter
Convert colors between HEX, RGB, and HSL with a live preview.
→open toolNew · AIAI Token Counter
Count real tokens for GPT prompts, right in your browser.
→open toolNew · AILLM Model Comparison
Compare context windows, pricing, and modalities across models.
→open toolNew · AIAI Prompt Builder
Compose a structured, best-practice prompt from clear sections.
→open toolNew · AIllms.txt Generator
Generate an llms.txt file to guide AI crawlers to your best content.
→open toolNew · AIJSON Schema Builder
Build JSON Schema for LLM structured outputs and function calling.
→open toolTextRegex Tester
Test regular expressions live, with match and group highlighting.
→open toolNew · AIAI Repo & Multi-File Token Calculator
Drag & drop multiple files to calculate LLM tokens, context fit, and spend.
→open tool