Simple Online Tools
Created to help you check details and finish everyday tasks with ease.
All Available Tools
Click any tool to start using it right away.
Star Note Rarity & Value Lookup
Check if your dollar bill with a star (★) is rare and see what it might be worth.
Fancy Serial Number Checker
See if your bill has a cool serial number pattern like numbers that repeat or read backward.
JSON Formatter & Cleaner
Make messy JSON text neat, easy to read, and fix formatting errors instantly.
Word & Character Counter
Count words, characters, sentences, and estimated reading time as you type.
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Why Use Tools Dart?
Private & Secure
Everything runs inside your web browser. We never save, track, or share what you type, search, or paste.
Instant Results
No waiting around or loading screens. Your answers appear right as you type or click.
Accurate & Reliable
All bill print sizes and error data come directly from official U.S. government printing records.
Common Questions
How do the tools work?
Every tool runs directly in your web browser. You can use any tool instantly without installing anything.
Are new tools added over time?
Yes, we regularly add new tools for everyday tasks. Check back to see what is new.
How do I search for a tool?
Use the search bar at the top or press ⌘ K (or Ctrl+K) on your keyboard.