diff --git a/NAMESPACE b/NAMESPACE
index 1fed441..7a5d4bd 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,8 +1,10 @@
 # Generated by roxygen2: do not edit by hand
 
 export(apache_httpd_version_history)
+export(apple_ios_version_history)
+export(complete_semver)
 export(google_chrome_version_history)
-export(is_valid)
+export(is_valid_semver)
 export(lighttpd_version_history)
 export(memcached_version_history)
 export(mongodb_version_history)
@@ -50,6 +52,7 @@ importFrom(rvest,xml_nodes)
 importFrom(stringi,stri_count_fixed)
 importFrom(stringi,stri_detect_fixed)
 importFrom(stringi,stri_detect_regex)
+importFrom(stringi,stri_extract_all_regex)
 importFrom(stringi,stri_extract_first_regex)
 importFrom(stringi,stri_match_first_regex)
 importFrom(stringi,stri_replace_all_fixed)
diff --git a/NEWS.md b/NEWS.md
index f203403..6ed7383 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
 0.1.0 
 * Initial release
-* Support for Apache httpd, Google Chrome lighttpd, memcached, mongodb, nginx, mysql,
-  openresty, openssh, sendmail and sqlite
\ No newline at end of file
+* Support for Apache httpd, Apple iOS, Google Chrome lighttpd, memcached, mongodb, nginx, 
+  mysql, openresty, openssh, sendmail and sqlite
\ No newline at end of file
diff --git a/R/RcppExports.R b/R/RcppExports.R
index 6a6ec6c..b943091 100644
--- a/R/RcppExports.R
+++ b/R/RcppExports.R
@@ -1,11 +1,11 @@
 # Generated by using Rcpp::compileAttributes() -> do not edit by hand
 # Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
 
-#' Test if semantic version strings are valid
+#' Test if semantic version strings are valid tri-string
 #'
 #' @param v character verctor of version strings
 #' @export
-is_valid <- function(v) {
-    .Call('_vershist_is_valid', PACKAGE = 'vershist', v)
+is_valid_semver <- function(v) {
+    .Call('_vershist_is_valid_semver', PACKAGE = 'vershist', v)
 }
 
diff --git a/R/ios.R b/R/ios.R
new file mode 100644
index 0000000..bb61745
--- /dev/null
+++ b/R/ios.R
@@ -0,0 +1,62 @@
+#' Retrieve Apple iOS  Version Release History
+#'
+#' Reads <https://en.wikipedia.org/wiki/IOS_version_history"> to build a data
+#' frame of Apple iOS version release numbers and dates with pseudo-semantic version
+#' strings parsed and separate fields added. The data frame is also arranged in
+#' order from lowest version to latest version and the `vers` column is an
+#' ordered factor.
+#'
+#' @md
+#' @note This does not distinguish by device target and only pulls the first release
+#'       date and excludes betas. If more granular data is needed, file an issue or PR.
+#' @export
+apple_ios_version_history <- function() {
+
+  pg <- xml2::read_html("https://en.wikipedia.org/wiki/IOS_version_history")
+
+  vers_nodes <- rvest::html_nodes(pg, xpath=".//th[contains(@id, '.') or contains(., '.')]")
+
+  dplyr::data_frame(
+    vers = rvest::html_text(vers_nodes),
+    rls_date = purrr::map_chr(
+      vers_nodes,
+      ~rvest::html_node(.x, xpath=".//following-sibling::td[3]") %>%
+        rvest::html_text()
+    )
+  ) %>%
+    dplyr::filter(!stri_detect_regex(vers, "Table|Post|Apple")) %>%
+    dplyr::mutate(vers = stri_replace_all_regex(vers, "\\[.*\\]", "")) -> xdf
+
+  dplyr::filter(xdf, !stri_detect_fixed(vers, "/")) %>%
+    dplyr::mutate(
+      rls_date = stri_extract_first_regex(
+        rls_date, "[[:alpha:]]{2,}[[:space:]]+[[:digit:]]{1,2},[[:space:]]+[[:digit:]]{4}"
+      )
+    ) -> simple
+
+  more_complex <- dplyr::filter(xdf, stri_detect_fixed(vers, "/"))
+
+  c_v <- stri_extract_all_regex(more_complex$vers, "[[:digit:]\\.]+")
+  c_d <- stri_extract_all_regex(more_complex$rls_date, "[[:alpha:]]{2,}[[:space:]]+[[:digit:]]{1,2},[[:space:]]+[[:digit:]]{4}")
+
+  purrr::map2_df(c_v, c_d, ~{
+    dplyr::data_frame(
+      vers = .x,
+      rls_date = .y
+    )
+  }) -> more_complex
+
+  dplyr::bind_rows(simple, more_complex) %>%
+    dplyr::mutate(rls_date = lubridate::mdy(rls_date)) %>%
+    dplyr::filter(!stri_detect_fixed(vers, "Beta")) %>%
+    dplyr::mutate(
+      vers = ifelse(stri_count_fixed(vers, ".") == 1, sprintf("%s.0", vers), vers)
+    ) %>%
+    dplyr::bind_cols(
+      semver::parse_version(.$vers) %>%
+        dplyr::as_data_frame()
+    ) %>%
+    dplyr::arrange(major, minor, patch) %>%
+    dplyr::mutate(vers = factor(vers, levels = vers))
+
+}
\ No newline at end of file
diff --git a/R/lighttpd.R b/R/lighttpd.R
index 724fc83..84207d4 100644
--- a/R/lighttpd.R
+++ b/R/lighttpd.R
@@ -3,7 +3,7 @@
 #' Reads from the `lighttpd` releases and snapshot downloads to build a
 #' data frame of version release numbers and dates. The caller is responsible
 #' for extracting out the version components due to the non-standard
-#' semantic versioning used. The [is_valid()] function can be used to test the
+#' semantic versioning used. The [is_valid_semver()] function can be used to test the
 #' validity of version strings.
 #'
 #' @md
diff --git a/R/utils.R b/R/utils.R
new file mode 100644
index 0000000..37ea05e
--- /dev/null
+++ b/R/utils.R
@@ -0,0 +1,34 @@
+#' Turn partial "valid" semantic version strings into a complete semver-tri or quad strings
+#'
+#' For MAJOR.MINOR.PATCH (semver-tri), turn `1` into `1.0.0`; `1.1` into `1.1.0`; `1.1.1`
+#' into `1.1.1`. For MAJOR.MINOR.PATCH.EXTENSION (semver-quad), turn `1` into `1.0.0.0`;
+#' `1.1` into `1.1.0.0`; `1.1.1.0` into `1.1.1.0`.
+#'
+#' Partial validity checking is performed to test if the input strings contain only
+#' digits and periods. "Invalid" input is returned unscathed.
+#'
+#' @param x a character vector of full or partial version strings
+#' @param quad (logical) if `TRUE` then a three-dot semver is returned, else a two-dot semver
+#'        is returned. Default: `FALSE`.
+#' @export
+complete_semver <- function(x, quad = FALSE) {
+
+  x <- stri_trim_both(x)
+  x <- stri_replace_all_regex(x, "(^\\.|\\.$)", "")
+
+  max_dots <- if (quad) 3 else 2
+
+  purrr::map_chr(x, ~{
+    if (stri_detect_regex(.x, "^[[:digit:]\\.]+$")) {
+      times <- max_dots - stri_count_fixed(.x, ".")
+      if (times > 0) {
+        sprintf("%s%s", .x, paste0(rep(".0", times), collapse=""))
+      } else {
+        .x
+      }
+    } else {
+      .x
+    }
+  })
+
+}
diff --git a/R/vershist-package.R b/R/vershist-package.R
index 8c4d2e5..21f728b 100644
--- a/R/vershist-package.R
+++ b/R/vershist-package.R
@@ -15,6 +15,7 @@
 #' @importFrom stringi stri_replace_all_regex stri_replace_first_fixed stri_trans_tolower
 #' @importFrom stringi stri_extract_first_regex stri_sub stri_replace_first_regex
 #' @importFrom stringi stri_replace_all_fixed stri_split_fixed stri_count_fixed stri_trim_both
+#' @importFrom stringi stri_extract_all_regex
 #' @importFrom lubridate year mdy mdy_hms parse_date_time
 #' @importFrom readr read_lines
 #' @importFrom utils globalVariables
diff --git a/README.Rmd b/README.Rmd
index 58ca014..7145b7b 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -1,5 +1,7 @@
 ---
 output: rmarkdown::github_document
+editor_options: 
+  chunk_output_type: console
 ---
 
 # vershist
@@ -18,6 +20,7 @@ The following functions are implemented:
 Core:
 
 - `apache_httpd_version_history`:	Retrieve Apache httpd Version Release History
+- `apple_ios_version_history`:	Retrieve Apple iOS Version Release History
 - `google_chrome_version_history`:	Retrieve Google Chrome Version Release History
 - `lighttpd_version_history`:	Retrieve lighttpd Version Release History
 - `memcached_version_history`:	Retrieve memcached Version Release History
@@ -31,7 +34,8 @@ Core:
 
 Utility:
 
-- `is_valid`:	Test if semantic version strings are valid
+- `is_valid_semver`:	Test if semantic version strings are valid
+- `complete_semver`:	Turn partial "valid" semantic version strings into a complete semver-tri or quad strings
 
 ## Installation
 
@@ -52,12 +56,31 @@ library(vershist)
 packageVersion("vershist")
 ```
 
+Utility
+
+```{r utility}
+versions <- c("steve", "1", "2.1", "3.2.1", "4.3.2.1")
+
+# Technically, a "valid" semver string is MAJOR.MINOR.PATCH
+is_valid_semver(versions)
+
+complete_semver(versions)
+
+complete_semver(versions, quad=TRUE)
+```
+
 Apache
 
 ```{r apache, cache=TRUE}
 apache_httpd_version_history()
 ```
 
+Apple iOS
+
+```{r apple_ios, cache=TRUE}
+apple_ios_version_history()
+```
+
 Google Chrome
 
 ```{r chrome, cache=TRUE}
diff --git a/README.md b/README.md
index 2b42b7d..6d77a11 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ Core:
 
   - `apache_httpd_version_history`: Retrieve Apache httpd Version
     Release History
+  - `apple_ios_version_history`: Retrieve Apple iOS Version Release
+    History
   - `google_chrome_version_history`: Retrieve Google Chrome Version
     Release History
   - `lighttpd_version_history`: Retrieve lighttpd Version Release
@@ -34,7 +36,9 @@ Core:
 
 Utility:
 
-  - `is_valid`: Test if semantic version strings are valid
+  - `is_valid_semver`: Test if semantic version strings are valid
+  - `complete_semver`: Turn partial “valid” semantic version strings
+    into a complete semver-tri or quad strings
 
 ## Installation
 
@@ -53,6 +57,29 @@ packageVersion("vershist")
 
     ## [1] '0.1.0'
 
+Utility
+
+``` r
+versions <- c("steve", "1", "2.1", "3.2.1", "4.3.2.1")
+
+# Technically, a "valid" semver string is MAJOR.MINOR.PATCH
+is_valid_semver(versions)
+```
+
+    ## [1] FALSE  TRUE  TRUE  TRUE FALSE
+
+``` r
+complete_semver(versions)
+```
+
+    ## [1] "steve"   "1.0.0"   "2.1.0"   "3.2.1"   "4.3.2.1"
+
+``` r
+complete_semver(versions, quad=TRUE)
+```
+
+    ## [1] "steve"   "1.0.0.0" "2.1.0.0" "3.2.1.0" "4.3.2.1"
+
 Apache
 
 ``` r
@@ -74,6 +101,27 @@ apache_httpd_version_history()
     ## 10 1.3.14 2000-10-10     2000     1     3    14 ""         ""   
     ## # ... with 19 more rows
 
+Apple iOS
+
+``` r
+apple_ios_version_history()
+```
+
+    ## # A tibble: 112 x 7
+    ##    vers  rls_date   major minor patch prerelease build
+    ##    <fct> <date>     <int> <int> <int> <chr>      <chr>
+    ##  1 1.0.0 2007-06-29     1     0     0 ""         ""   
+    ##  2 1.0.1 2007-07-31     1     0     1 ""         ""   
+    ##  3 1.0.2 2007-08-21     1     0     2 ""         ""   
+    ##  4 1.1.0 2007-09-14     1     1     0 ""         ""   
+    ##  5 1.1.1 2007-09-27     1     1     1 ""         ""   
+    ##  6 1.1.2 2007-11-12     1     1     2 ""         ""   
+    ##  7 1.1.3 2008-01-15     1     1     3 ""         ""   
+    ##  8 1.1.4 2008-02-26     1     1     4 ""         ""   
+    ##  9 1.1.5 2008-07-15     1     1     5 ""         ""   
+    ## 10 2.0.0 2008-07-11     2     0     0 ""         ""   
+    ## # ... with 102 more rows
+
 Google Chrome
 
 ``` r
diff --git a/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.RData b/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.RData
new file mode 100644
index 0000000..2484746
Binary files /dev/null and b/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.RData differ
diff --git a/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.rdb b/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.rdb
new file mode 100644
index 0000000..e69de29
diff --git a/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.rdx b/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.rdx
new file mode 100644
index 0000000..868ca76
Binary files /dev/null and b/README_cache/gfm/apple_ios_c87a0ba8187fd58c6318fd9ff44ca2a6.rdx differ
diff --git a/man/apple_ios_version_history.Rd b/man/apple_ios_version_history.Rd
new file mode 100644
index 0000000..daa4fb5
--- /dev/null
+++ b/man/apple_ios_version_history.Rd
@@ -0,0 +1,19 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ios.R
+\name{apple_ios_version_history}
+\alias{apple_ios_version_history}
+\title{Retrieve Apple iOS  Version Release History}
+\usage{
+apple_ios_version_history()
+}
+\description{
+Reads \url{https://en.wikipedia.org/wiki/IOS_version_history"} to build a data
+frame of Apple iOS version release numbers and dates with pseudo-semantic version
+strings parsed and separate fields added. The data frame is also arranged in
+order from lowest version to latest version and the \code{vers} column is an
+ordered factor.
+}
+\note{
+This does not distinguish by device target and only pulls the first release
+date and excludes betas. If more granular data is needed, file an issue or PR.
+}
diff --git a/man/complete_semver.Rd b/man/complete_semver.Rd
new file mode 100644
index 0000000..b5f462e
--- /dev/null
+++ b/man/complete_semver.Rd
@@ -0,0 +1,23 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/utils.R
+\name{complete_semver}
+\alias{complete_semver}
+\title{Turn partial "valid" semantic version strings into a complete semver-tri or quad strings}
+\usage{
+complete_semver(x, quad = FALSE)
+}
+\arguments{
+\item{x}{a character vector of full or partial version strings}
+
+\item{quad}{(logical) if `TRUE` then a three-dot semver is returned, else a two-dot semver
+is returned. Default: `FALSE`.}
+}
+\description{
+For MAJOR.MINOR.PATCH (semver-tri), turn `1` into `1.0.0`; `1.1` into `1.1.0`; `1.1.1`
+into `1.1.1`. For MAJOR.MINOR.PATCH.EXTENSION (semver-quad), turn `1` into `1.0.0.0`;
+`1.1` into `1.1.0.0`; `1.1.1.0` into `1.1.1.0`.
+}
+\details{
+Partial validity checking is performed to test if the input strings contain only
+digits and periods. "Invalid" input is returned unscathed.
+}
diff --git a/man/is_valid.Rd b/man/is_valid.Rd
deleted file mode 100644
index c456e40..0000000
--- a/man/is_valid.Rd
+++ /dev/null
@@ -1,14 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/RcppExports.R
-\name{is_valid}
-\alias{is_valid}
-\title{Test if semantic version strings are valid}
-\usage{
-is_valid(v)
-}
-\arguments{
-\item{v}{character verctor of version strings}
-}
-\description{
-Test if semantic version strings are valid
-}
diff --git a/man/is_valid_semver.Rd b/man/is_valid_semver.Rd
new file mode 100644
index 0000000..1e4e0b9
--- /dev/null
+++ b/man/is_valid_semver.Rd
@@ -0,0 +1,14 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/RcppExports.R
+\name{is_valid_semver}
+\alias{is_valid_semver}
+\title{Test if semantic version strings are valid tri-string}
+\usage{
+is_valid_semver(v)
+}
+\arguments{
+\item{v}{character verctor of version strings}
+}
+\description{
+Test if semantic version strings are valid tri-string
+}
diff --git a/man/lighttpd_version_history.Rd b/man/lighttpd_version_history.Rd
index 3cf2db0..cb720ae 100644
--- a/man/lighttpd_version_history.Rd
+++ b/man/lighttpd_version_history.Rd
@@ -10,6 +10,6 @@ lighttpd_version_history()
 Reads from the \code{lighttpd} releases and snapshot downloads to build a
 data frame of version release numbers and dates. The caller is responsible
 for extracting out the version components due to the non-standard
-semantic versioning used. The \code{\link[=is_valid]{is_valid()}} function can be used to test the
+semantic versioning used. The \code{\link[=is_valid_semver]{is_valid_semver()}} function can be used to test the
 validity of version strings.
 }
diff --git a/src/RcppExports.cpp b/src/RcppExports.cpp
index 790bcc9..920cd2a 100644
--- a/src/RcppExports.cpp
+++ b/src/RcppExports.cpp
@@ -5,20 +5,20 @@
 
 using namespace Rcpp;
 
-// is_valid
-std::vector < bool > is_valid(std::vector < std::string > v);
-RcppExport SEXP _vershist_is_valid(SEXP vSEXP) {
+// is_valid_semver
+std::vector < bool > is_valid_semver(std::vector < std::string > v);
+RcppExport SEXP _vershist_is_valid_semver(SEXP vSEXP) {
 BEGIN_RCPP
     Rcpp::RObject rcpp_result_gen;
     Rcpp::RNGScope rcpp_rngScope_gen;
     Rcpp::traits::input_parameter< std::vector < std::string > >::type v(vSEXP);
-    rcpp_result_gen = Rcpp::wrap(is_valid(v));
+    rcpp_result_gen = Rcpp::wrap(is_valid_semver(v));
     return rcpp_result_gen;
 END_RCPP
 }
 
 static const R_CallMethodDef CallEntries[] = {
-    {"_vershist_is_valid", (DL_FUNC) &_vershist_is_valid, 1},
+    {"_vershist_is_valid_semver", (DL_FUNC) &_vershist_is_valid_semver, 1},
     {NULL, NULL, 0}
 };
 
diff --git a/src/vershist-main.cpp b/src/vershist-main.cpp
index ca360e6..b2418b6 100644
--- a/src/vershist-main.cpp
+++ b/src/vershist-main.cpp
@@ -15,12 +15,12 @@ bool one_is_valid(std::string v) {
 
 }
 
-//' Test if semantic version strings are valid
+//' Test if semantic version strings are valid tri-string
 //'
 //' @param v character verctor of version strings
 //' @export
 // [[Rcpp::export]]
-std::vector < bool > is_valid(std::vector < std::string > v) {
+std::vector < bool > is_valid_semver(std::vector < std::string > v) {
 
   std::vector < bool > ret(v.size());