About Compare Lists

Fast, private list comparison that runs entirely in your browser.

🐕

Why Nobu Tools?

Nobu is my dog, and the inspiration behind these tools. Life is short, so we should spend less time on tedious tasks and more time with the ones we love.

Nobu Tools are built to save you time. Fast, private, no-nonsense utilities that just work, so you can get back to what matters.

🔒 Privacy First

Your lists stay yours. Everything runs locally in your browser using WebAssembly:

No data is ever sent to any server. Your lists stay on your device
No data is logged or stored. We can't see what you compare
Works completely offline. Once loaded, no internet needed
Handle thousands of items. Fast performance with large lists

⚡ How It Works

Compare Lists uses Rust's high-performance HashSet data structure compiled to WebAssembly. This gives you O(1) average lookup time for set operations, meaning instant results even with thousands of items.

Output Sections

Only in First List Items that exist in your first list but not in the second

Only in Second List Items that exist in your second list but not in the first

In Both Lists Items that appear in both lists (intersection)

Combined List All unique items from both lists combined (union)

Input Formats

One per line (default): Each line is treated as a separate item
Comma separated: Items separated by commas (CSV-style)
Tab separated: Items separated by tabs (TSV-style)
Semicolon separated: Items separated by semicolons
Pipe separated: Items separated by | characters
Bulleted list: Lines starting with -, •, or * (copied from documents)
Numbered list: Lines starting with 1., 2), etc. (copied from documents)
Whitespace separated: Items separated by spaces or tabs on a single line
Quoted CSV: Standard CSV with quoted fields. Handles commas inside quotes and escaped quotes

Skip first item (header): Enable this to ignore the first entry in each list, useful when your data includes column headers.

Text Normalization

Case insensitive: Treat "Apple" and "apple" as the same
Trim spaces: Remove leading/trailing whitespace
Remove all whitespace: Strip all spaces from items
Skip empty lines: Ignore blank items

Content Filtering

Remove punctuation: Strip periods, commas, etc.
Remove numbers: Strip digits 0-9
Disregard character order: Match anagrams ("abc" = "cba")

💼 Use Cases

📧

Email Lists

Find subscribers who are on one list but not another. Identify duplicates.

📦

Inventory Management

Compare product catalogs to find items that need to be added or removed.

👥

Customer Data

Compare customer lists from different sources to find unique or common entries.

📁

File Comparison

Compare directory listings to find files that exist in one location but not another.

⌨️ Keyboard Shortcuts

Ctrl+Enter: Run comparison

❓ FAQ

Is my data sent to a server?

No. All comparison happens locally. Your lists never leave your device.

How many items can I compare?

The tool handles thousands of items with ease. Performance remains fast thanks to efficient HashSet operations.

Does it work offline?

Yes! Once loaded, no internet connection required.

Ready to Compare?

Try Compare Lists now. No signup required.

Start Comparing →