Use cases
Common jobs with ListDiff—cleaning exports, finding gaps, or comparing Instagram lists from your official download.
Each page explains what to put in List A vs List B and which result tab answers your question. You bring the paste or file; ListDiff never logs into third-party accounts.
Everyday jobs
Subtract an exclusion list
Main list minus a to-remove list—A only is the cleaned result.
Compare attendance or roster lists
Full roster vs check-in—A only shows who is missing.
Compare phone number lists
Find unique and shared numbers when formats match on both sides.
Compare keyword lists
Find SEO keyword gaps between your export and a competitor set.
Compare URL or domain lists
Spot added or removed URLs between two crawls or sitemaps.
Compare inventory or SKU lists
Find discontinued and new product codes between catalog exports.
Email & CSV
Compare email lists
Remove a suppression list, find overlaps, or merge unique addresses.
Compare CSV files by ID
Extract Col N, then find missing and new SKUs or customer IDs.
Files
Compare two local files
Paste or upload TXT/CSV and compare on your device.
Compare HTML files as lists
Turn list-like HTML into lines, then compare.
Compare 2 Instagram lists
Start here: download your data, then compare two lists in the browser.
Compare followers to following
Mutuals, who doesn’t follow back, and who you haven’t followed.
Who doesn’t follow you back
No third-party app—official download only.
Who unfollowed you
Compare two follower downloads from different dates.
Download help: time and files guide