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20d ago

Compare Lists - Compare two lists instantly. Private, offline, free.

Compare two lists and instantly see what's only in A, only in B, and shared by both. Built-in templates for Instagram followers, Excel/CSV columns, database IDs, and inventory lists. 100% client-side; nothing you paste is ever uploaded, no login required. Works offline, has a Chrome extension, and includes a visual diff, regex splitting, and find & replace. Free, no signup.

What's the one dev tool tab you ALWAYS have open?

Quick confession I opened my browser today and counted
14 tabs. 9 of them were "utility" sites:
- 2 different JSON formatters (one for big files, one prettier)
- A JWT decoder
- A base64 encoder
- A regex tester
- A UUID generator
- A cron expression parser
- Two SQL formatters (because one doesn't do BigQuery)
Every single one has ads. Half of them upload my data to
"the cloud" for a task that's literally 3 lines of JavaScript.
Here's what's wild I've been doing this for 8+ years.
Every dev I know does this. We just accept it.
So I wanted to ask the PH community:
1. What's the ONE utility tool tab you can never close?
2. Have you ever pasted something sensitive (JWT, API
response, DB dump) into a random online tool and later
thought "wait... where did that data just go?"
3. If you could merge 5 of these tools into one keyboard
shortcut ( K style), which 5 would they be?
Genuinely curious what your daily "utility stack" looks
like I've been building something in this space and
the patterns I'm seeing are wild.
(No link drop this is a real question. Happy to share
what I'm working on in the comments if anyone's curious.)

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