Guides
Compare lists the right way
Practical, no-fluff guides on comparing two lists, finding duplicates, and reconciling data across spreadsheets, exports, and social platforms.
How to Compare Two Lists Online (Step-by-Step)
Paste two lists, set your match rules, and read five clear result sets. A quick walkthrough of comparing lists online without a spreadsheet.
Union vs. Intersection vs. Difference: Set Operations Explained
A plain-English guide to the four core set operations — union, intersection, difference, and symmetric difference — with worked examples.
How to Find Duplicates Between Two Lists
Find items duplicated across two lists (the intersection) and clean up duplicates within a single list, with or without case sensitivity.
How to Compare Two Excel Columns for Differences (3 Methods)
Three ways to compare two Excel columns: conditional formatting, a COUNTIF/MATCH formula, and pasting both columns into an online comparison tool.
How to Compare Two Lists in Google Sheets (and a Faster Way)
Compare two columns in Google Sheets with MATCH/ISNA and conditional formatting, or skip the formulas with a browser-based comparison tool.
How to Compare Instagram Follower Lists (Who Unfollowed You)
Export your Instagram followers and following lists, then compare them to see who unfollowed you, who doesn't follow back, and what changed.