diff --git a/DESCRIPTION b/DESCRIPTION
index 318bdb1..5117179 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -23,7 +23,7 @@ BugReports: https://github.com/coatless-rpkg/searcher/issues
 Depends: R (>= 3.3.0)
 License: GPL (>= 2)
 Encoding: UTF-8
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
 Roxygen: list(markdown = TRUE)
 Suggests: 
     testthat (>= 2.1.0),
diff --git a/NAMESPACE b/NAMESPACE
index bbc133b..5f26607 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -9,6 +9,7 @@ export(search_ecosia)
 export(search_gh)
 export(search_github)
 export(search_google)
+export(search_grep)
 export(search_ixquick)
 export(search_rscom)
 export(search_rseek)
diff --git a/NEWS.md b/NEWS.md
index ae6a99e..24531e6 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,13 @@
+# searcher 0.0.7
+
+## Features
+
+- Added search portal:
+    - `search_grep()`: Searches on grep.app. 
+      ([#35](https://github.com/r-assist/searcher/issues/35), 
+       [#37](https://github.com/r-assist/searcher/pull/37))
+
+
 # searcher 0.0.6
 
 ## Features
diff --git a/R/index-sites.R b/R/index-sites.R
index a25baac..fcbaf3c 100644
--- a/R/index-sites.R
+++ b/R/index-sites.R
@@ -45,6 +45,8 @@ site_index =
   list(
     site_entry("google", "https://google.com/search?q="),
     site_entry("bing", "https://bing.com/search?q="),
+    site_entry("grep", "https://grep.app/search?q=",
+               keywords = keyword_entry("&filter[lang][0]=R")),
     site_entry("duckduckgo", "https://duckduckgo.com/?q=", "ddg"),
     site_entry("startpage", "https://startpage.com/do/dsearch?query=", "sp"),
     site_entry("ecosia", "https://www.ecosia.org/search?q="),
diff --git a/R/search-functions.R b/R/search-functions.R
index 8394bf8..31f8f94 100644
--- a/R/search-functions.R
+++ b/R/search-functions.R
@@ -17,7 +17,7 @@
 #' @seealso [search_google()], [search_bing()], [search_duckduckgo()],
 #'          [search_startpage()], [search_rseek()], [search_twitter()],
 #'          [search_rstudio_community()], [search_stackoverflow()],
-#'          [search_github()], [search_bitbucket()], and [searcher()]
+#'          [search_github()], [search_grep()], [search_bitbucket()], and [searcher()]
 #' @examples
 #' # Search in a generic way
 #' search_site("r-project", "google")
@@ -55,6 +55,12 @@
 #' # Search all languages on GitHub Issues for bivariate normal
 #' search_github("bivariate normal", rlang = FALSE)
 #'
+#' # Search R code on GitHub for numerical optimization
+#' search_grep("optim")
+#'
+#' # Search all code on GitHub for numerical optimization
+#' search_grep("optim", rlang = FALSE)
+#'
 #' # Search BitBucket for assertions
 #' search_bitbucket("assertions")
 #'
@@ -79,6 +85,7 @@ search_site = function(query,
                          "so",
                          "github",
                          "gh",
+                         "grep",
                          "bitbucket",
                          "bb"
                        ),
@@ -102,6 +109,7 @@ search_site = function(query,
     so             = search_stackoverflow(query, rlang),
     github         = ,      # empty case carried below
     gh             = search_github(query, rlang),
+    grep           = search_grep(query, rlang),
     bitbucket      = ,      # empty case carried below
     bb             = search_bitbucket(query, rlang)
   )
@@ -295,6 +303,14 @@ search_github = searcher("gh")
 #' @export
 search_gh = search_github
 
+#' @rdname search_site
+#' @export
+#' @section grep.app Search:
+#' The `search_grep()` function searches all public code on
+#' [GitHub](https://github.com) using [grep.app](https://grep.app) by
+#' querying: `https://grep.app/search?q=<query-here>&filter[lang][0]=R`
+search_grep = searcher("grep")
+
 #' @rdname search_site
 #' @export
 #' @section BitBucket Search:
diff --git a/README.Rmd b/README.Rmd
index 8649c5e..883e1bc 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -64,10 +64,10 @@ The `search_*()` functions can be used to search a query directly from _R_ on
 major search engines, programming help websites, and code repositories. The following search
 platforms are supported: [Google](https://www.google.com), [Bing](https://www.bing.com/),
 [DuckDuckGo](https://duckduckgo.com/), [Startpage](https://www.startpage.com/en/),
-Ecosia, [rseek](https://rseek.org/),
-[Twitter](https://twitter.com/search), [StackOverflow](https://stackoverflow.com/search), 
+Ecosia, [rseek](https://rseek.org/), [Twitter](https://twitter.com/search), [StackOverflow](https://stackoverflow.com/search), 
 [RStudio Community](https://community.rstudio.com/search), 
-[GitHub](https://github.com/search), and [BitBucket](https://bitbucket.org/product/).
+[GitHub](https://github.com/search), [grep.app](https://grep.app/), 
+and [BitBucket](https://bitbucket.org/product/).
 By default, an appropriate suffix for each platform that ensures relevant 
 results to _R_ is appended to all queries. This behavior can be disabled by 
 using `rlang = FALSE`.
@@ -93,6 +93,10 @@ search_stackoverflow("linear regression", rlang = FALSE) # or search_so(...)
 search_rstudio_community("tips")
 search_rstudio_community("tips", rlang = FALSE)          # or search_rscom(...)
 
+# Searching GitHub code for graphs in R and other languages
+search_grep("graph")
+search_grep("graph", rlang = FALSE)
+
 # Searching GitHub Issues for maps in R and other languages
 search_github("maps")
 search_github("maps", rlang = FALSE)                     # or search_gh(...)
@@ -138,6 +142,7 @@ search_bing()
 search_ecosia()
 search_rseek()
 search_twitter()
+search_grep()
 search_duckduckgo()        # or search_ddg()
 search_startpage()         # or search_sp()
 search_stackoverflow()     # or search_so()
diff --git a/man/search_site.Rd b/man/search_site.Rd
index c30e63a..5811ea0 100644
--- a/man/search_site.Rd
+++ b/man/search_site.Rd
@@ -18,6 +18,7 @@
 \alias{search_so}
 \alias{search_github}
 \alias{search_gh}
+\alias{search_grep}
 \alias{search_bitbucket}
 \alias{search_bb}
 \title{Search a Query on a Search Portal in a Web Browser}
@@ -26,7 +27,7 @@ search_site(
   query,
   site = c("google", "bing", "duckduckgo", "ddg", "startpage", "sp", "rseek",
     "rstudio community", "rscom", "twitter", "stackoverflow", "so", "github", "gh",
-    "bitbucket", "bb"),
+    "grep", "bitbucket", "bb"),
   rlang = TRUE
 )
 
@@ -62,6 +63,8 @@ search_github(query = geterrmessage(), rlang = TRUE)
 
 search_gh(query = geterrmessage(), rlang = TRUE)
 
+search_grep(query = geterrmessage(), rlang = TRUE)
+
 search_bitbucket(query = geterrmessage(), rlang = TRUE)
 
 search_bb(query = geterrmessage(), rlang = TRUE)
@@ -177,6 +180,13 @@ search interface please see:
 and \url{https://help.github.com/articles/searching-code/}
 }
 
+\section{grep.app Search}{
+
+The \code{search_grep()} function searches all public code on
+\href{https://github.com}{GitHub} using \href{https://grep.app}{grep.app} by
+querying: \verb{https://grep.app/search?q=<query-here>&filter[lang][0]=R}
+}
+
 \section{BitBucket Search}{
 
 The \code{search_bitbucket()} and \code{search_bb()} functions both search
@@ -225,6 +235,12 @@ search_github("bivariate normal")
 # Search all languages on GitHub Issues for bivariate normal
 search_github("bivariate normal", rlang = FALSE)
 
+# Search R code on GitHub for numerical optimization
+search_grep("optim")
+
+# Search all code on GitHub for numerical optimization
+search_grep("optim", rlang = FALSE)
+
 # Search BitBucket for assertions
 search_bitbucket("assertions")
 
@@ -238,5 +254,5 @@ options(error = search_google)
 \code{\link[=search_google]{search_google()}}, \code{\link[=search_bing]{search_bing()}}, \code{\link[=search_duckduckgo]{search_duckduckgo()}},
 \code{\link[=search_startpage]{search_startpage()}}, \code{\link[=search_rseek]{search_rseek()}}, \code{\link[=search_twitter]{search_twitter()}},
 \code{\link[=search_rstudio_community]{search_rstudio_community()}}, \code{\link[=search_stackoverflow]{search_stackoverflow()}},
-\code{\link[=search_github]{search_github()}}, \code{\link[=search_bitbucket]{search_bitbucket()}}, and \code{\link[=searcher]{searcher()}}
+\code{\link[=search_github]{search_github()}}, \code{\link[=search_grep]{search_grep()}}, \code{\link[=search_bitbucket]{search_bitbucket()}}, and \code{\link[=searcher]{searcher()}}
 }
diff --git a/man/searcher-package.Rd b/man/searcher-package.Rd
index c9c752f..b0ad90d 100644
--- a/man/searcher-package.Rd
+++ b/man/searcher-package.Rd
@@ -3,7 +3,6 @@
 \docType{package}
 \name{searcher-package}
 \alias{searcher-package}
-\alias{_PACKAGE}
 \title{searcher: Query Search Interfaces}
 \description{
 Provides a search interface to look up terms on 'Google', 'Bing', 'DuckDuckGo', 'Startpage', 'Ecosia', 'rseek', 'Twitter', 'StackOverflow', 'RStudio Community', 'GitHub', and 'BitBucket'. Upon searching, a browser window will open with the aforementioned search results.