diff --git a/README.md b/README.md
index 2b9e97d..a67af25 100644
--- a/README.md
+++ b/README.md
@@ -27,11 +27,11 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 
 # Summary
 
-To date, **714** apps/tools covered, divided in **43** categories.
+To date, **715** apps/tools covered, divided in **43** categories.
 
 # Index
 
-[Backup](#backup) (8) | [Calculators](#calc) (6) | [Chat and instant messaging](#chat) (10) | [Conversion](#conversion) (7) | [Data management](#data-management) (31) | [Data transfer](#transfer) (33) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (21) | [Email](#email) (10) | [File and file system handling](#file-handling) (35) | [File manager](#file-manager) (11) | [File renamers](#file-renamer) (7) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (18) | [Games](#games) (35) | [Git and accessories](#git) (26) | [Graphics](#graphics) (20) | [Multimedia](#multimedia) (3) | [Networking](#networking) (19) | [Note taking](#note-taking) (14) | [Office tools](#office) (15) | [Organizers and calendars](#organizers) (14) | [Online search and resources](#online) (8) | [Password managers](#password-manager) (11) | [Productivity](#productivity) (25) | [Programming](#programming) (28) | [Science](#science) (8) | [Security and encryption](#security) (14) | [Shells](#shells) (6) | [Sound and music](#music) (24) | [System monitoring](#monitor) (26) | [System tools](#system) (27) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (41) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (18) | [Utilities](#utility) (31) | [Versioning](#versioning) (6) | [Viewers](#viewers) (27) | [Web browser](#browser) (16) | [Web development](#webdev) (16)
+[Backup](#backup) (8) | [Calculators](#calc) (6) | [Chat and instant messaging](#chat) (10) | [Conversion](#conversion) (7) | [Data management](#data-management) (31) | [Data transfer](#transfer) (33) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (21) | [Email](#email) (10) | [File and file system handling](#file-handling) (35) | [File manager](#file-manager) (11) | [File renamers](#file-renamer) (7) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (18) | [Games](#games) (35) | [Git and accessories](#git) (26) | [Graphics](#graphics) (20) | [Multimedia](#multimedia) (3) | [Networking](#networking) (19) | [Note taking](#note-taking) (14) | [Office tools](#office) (15) | [Organizers and calendars](#organizers) (14) | [Online search and resources](#online) (8) | [Password managers](#password-manager) (11) | [Productivity](#productivity) (25) | [Programming](#programming) (28) | [Science](#science) (8) | [Security and encryption](#security) (14) | [Shells](#shells) (6) | [Sound and music](#music) (24) | [System monitoring](#monitor) (26) | [System tools](#system) (27) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (41) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (18) | [Utilities](#utility) (31) | [Versioning](#versioning) (6) | [Viewers](#viewers) (27) | [Web browser](#browser) (16) | [Web development](#webdev) (17)
 
 Some links to [related resources](#resources).
 
@@ -896,6 +896,7 @@ Static site generators, load test tools..
 * [http-tanker](https://github.com/PierreKieffer/http-tanker) - Terminal application used for API testing; easily create, manage and execute http requests from the terminal.
 * [Hugo](https://github.com/gohugoio/hugo) - The world’s fastest framework for building websites.
 * [iola](https://github.com/pvarentsov/iola) - A command-line socket client with REST API. It helps to work with socket servers using your favorite REST client.
+* [is-up-cli](https://github.com/sindresorhus/is-up-cli) - Check whether a website is up or down using the [isitup.org](https://isitup.org/) API.
 * [linkchecker](https://github.com/linkchecker/linkchecker) - Check links in web documents or full websites.
 * [lychee](https://github.com/lycheeverse/lychee) - Fast, async, resource-friendly link checker written in Rust.
 * [Metalsmith](https://github.com/metalsmith/metalsmith) - An extremely simple static site generator; all functionalities are provided by plugins that can be combined and chained; written and extendable in Javascript.  
diff --git a/data/apps.csv b/data/apps.csv
index 5057856..b8a1853 100644
--- a/data/apps.csv
+++ b/data/apps.csv
@@ -713,3 +713,4 @@ programming,clog,,https://github.com/clog-tool/clog-cli,Creates a changelog auto
 programming,Cookiecutter,,https://github.com/audreyr/cookiecutter,"A cross-platform command-line utility that creates projects from cookiecutters (project templates), e.g. Python package projects, C projects."
 chat,kirc,http://kirc.io/,https://github.com/mcpcpc/kirc,A tiny IRC client written in POSIX C99.
 programming,cgasm,,https://github.com/bnagy/cgasm,"Pronounced “SeekAzzem”, it is a standalone, offline terminal-based tool with no dependencies that gives me x86 assembly documentation."
+webdev,is-up-cli,,https://github.com/sindresorhus/is-up-cli,Check whether a website is up or down using the [isitup.org](https://isitup.org/) API.