diff --git a/README.md b/README.md
index 30a6eee..a85c9d9 100644
--- a/README.md
+++ b/README.md
@@ -32,11 +32,11 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 
 # Summary
 
-To date, **908** apps/tools covered, organized in **45** categories.
+To date, **909** apps/tools covered, organized in **45** categories.
 
 # Index
 
-[Backup](#backup) (9) | [Calculators](#calc) (9) | [Chat and instant messaging](#chat) (12) | [Commands cheatsheet and snippets](#cheatsheet) (16) | [Conversion](#conversion) (7) | [Data management](#data-management) (38) | [Data transfer](#transfer) (32) | [Directory changers](#cd) (13) | [Disk usage analyzers](#disk-analyzer) (12) | [Editors](#editors) (23) | [Email](#email) (12) | [File and file system handling](#file-handling) (45) | [File manager](#file-manager) (17) | [File renamers](#file-renamer) (11) | [File systems](#file-system) (4) | [Font management](#font) (2) | [Funny tools](#funny) (25) | [Games](#games) (37) | [Git and accessories](#git) (33) | [Graphics](#graphics) (26) | [Multimedia](#multimedia) (8) | [Networking](#networking) (23) | [Note taking](#note-taking) (17) | [Office tools](#office) (17) | [Organizers and calendars](#organizers) (17) | [Online search and resources](#online) (10) | [Password managers](#password-manager) (14) | [Productivity](#productivity) (38) | [Programming](#programming) (33) | [Science](#science) (10) | [Security and encryption](#security) (20) | [Shells](#shells) (8) | [Sound and music](#music) (26) | [System monitoring](#monitor) (33) | [System tools](#system) (32) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (47) | [Text search](#text-search) (10) | [Todo managers](#todo-manager) (21) | [Torrent](#torrent) (7) | [Utilities](#utility) (46) | [Versioning](#versioning) (6) | [Viewers](#viewers) (35) | [Web browser](#browser) (16) | [Web development](#webdev) (22)
+[Backup](#backup) (9) | [Calculators](#calc) (9) | [Chat and instant messaging](#chat) (12) | [Commands cheatsheet and snippets](#cheatsheet) (16) | [Conversion](#conversion) (7) | [Data management](#data-management) (38) | [Data transfer](#transfer) (32) | [Directory changers](#cd) (13) | [Disk usage analyzers](#disk-analyzer) (12) | [Editors](#editors) (23) | [Email](#email) (12) | [File and file system handling](#file-handling) (46) | [File manager](#file-manager) (17) | [File renamers](#file-renamer) (11) | [File systems](#file-system) (4) | [Font management](#font) (2) | [Funny tools](#funny) (25) | [Games](#games) (37) | [Git and accessories](#git) (33) | [Graphics](#graphics) (26) | [Multimedia](#multimedia) (8) | [Networking](#networking) (23) | [Note taking](#note-taking) (17) | [Office tools](#office) (17) | [Organizers and calendars](#organizers) (17) | [Online search and resources](#online) (10) | [Password managers](#password-manager) (14) | [Productivity](#productivity) (38) | [Programming](#programming) (33) | [Science](#science) (10) | [Security and encryption](#security) (20) | [Shells](#shells) (8) | [Sound and music](#music) (26) | [System monitoring](#monitor) (33) | [System tools](#system) (32) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (47) | [Text search](#text-search) (10) | [Todo managers](#todo-manager) (21) | [Torrent](#torrent) (7) | [Utilities](#utility) (46) | [Versioning](#versioning) (6) | [Viewers](#viewers) (35) | [Web browser](#browser) (16) | [Web development](#webdev) (22)
 
 Some links to [related resources](#resources).
 
@@ -280,6 +280,7 @@ File managers, tagging, bookmarking.
 * [czkawka](https://github.com/qarmin/czkawka) - Remove unnecessary files from your computer
 * [detox](https://sourceforge.net/projects/detox/) - A utility designed to easily clean up filenames
 * [Dext](https://github.com/AfzGit/dext) - (Directories by Extensions) is a script that moves (or copies) files of the same extension into a folder.
+* [Dirdiff](https://github.com/OCamlPro/dirdiff) - Efficiently compute the differences between two directories.
 * [doppelganger](https://github.com/witchard/doppelganger) - Save and load your shell environment to create doppelganger shells!
 * [dtrx](https://github.com/dtrx-py/dtrx) - (Do The Right eXtraction) aims at taking "all the hassle out of extracting archives"; allows to use one command to extract archives in different formats, recursive extraction (files into file) and extracts files into dedicated directories.
 * [entr](https://github.com/eradman/entr) - Event Notify Test Runner - Run an arbitrary command when files change.
diff --git a/data/apps.csv b/data/apps.csv
index aac0bbe..e3dd077 100644
--- a/data/apps.csv
+++ b/data/apps.csv
@@ -907,3 +907,4 @@ multimedia,YouTube TUI,https://siriusmart.github.io/youtube-tui/,https://github.
 monitor,PCtrl,,https://github.com/MohamedSherifNoureldin/PCtrl,"Robust, featureful, easy-to-use and powerful process manager.",,,,
 git,Git Auto Sync,,https://github.com/GitJournal/git-auto-sync,"Automatically commits changes to a git repository, and always keep that repo up to date.",,,,
 note-taking,meudeus,,https://github.com/dj8yfo/meudeus,A skim-based `*.md` explore and surf tool.,,,,
+file-handling,Dirdiff,,https://github.com/OCamlPro/dirdiff,Efficiently compute the differences between two directories.,,,,