Count Duplicates is a free online JavaScript tool that aggregates pasted lines and shows the count of occurrences of each value. Results include unique values, occurrence counts, the total number of lines and the number of unique values. Output can be copied in TAB or CSV format for spreadsheets. Data is processed client-side in the browser and is not sent or stored elsewhere.
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duplicateword.com
A free web app that finds duplicate words in text and highlights them in real time as the user pastes or types. A list of duplicates appears beside the editor, and individual word highlighting can be toggled by clicking. Settings include minimum word length, minimum repeat count and case sensitivity, with light, dark or system themes.
pacolabs.com
Minifig Scan is a fan-made app for iOS and Android that scans data codes on supported LEGO Minifigure boxes to identify contents and avoid duplicates. It tracks collections with counters, favorites and notes, offers 360° views, blind mode, news and widgets.