diff --git a/cobalt/debug/console/command_manager.cc b/cobalt/debug/console/command_manager.cc
index 3c30ae38912e..f87ea66e2c35 100644
--- a/cobalt/debug/console/command_manager.cc
+++ b/cobalt/debug/console/command_manager.cc
@@ -50,9 +50,15 @@ ConsoleCommandManager::CommandHandler::~CommandHandler() {
 // static
 bool ConsoleCommandManager::CommandHandler::IsOnEnableOrTrue(
     const std::string& message) {
+  #if SB_API_VERSION < 16
   return (SbStringCompareNoCase("on", message.c_str()) == 0) ||
          (SbStringCompareNoCase("enable", message.c_str()) == 0) ||
          (SbStringCompareNoCase("true", message.c_str()) == 0);
+  #else
+  return (strcasecmp("on", message.c_str()) == 0) ||
+         (strcasecmp("enable", message.c_str()) == 0) ||
+         (strcasecmp("true", message.c_str()) == 0);
+  #endif // SB_API_VERSION < 16
 }
 
 
diff --git a/cobalt/dom/on_screen_keyboard.cc b/cobalt/dom/on_screen_keyboard.cc
index ec41ff409b62..07a3c9704262 100644
--- a/cobalt/dom/on_screen_keyboard.cc
+++ b/cobalt/dom/on_screen_keyboard.cc
@@ -51,8 +51,12 @@ bool ParseColor(const char* color_str, int& r, int& g, int& b) {
   }
 
   // Handle rgb color notation rgb(R, G, B)
-  if (!is_hex && len >= 10 &&
-      SbStringCompareNoCaseN("rgb(", color_str, 4) == 0) {
+  #if SB_API_VERSION < 16
+  bool strcmp = SbStringCompareNoCaseN("rgb(", color_str, 4) == 0;
+  #else
+  bool strcmp = strncasecmp("rgb(", color_str, 4) == 0;
+  #endif //SB_API_VERSION < 16
+  if (!is_hex && len >= 10 && strcmp) {
     int rgb_tmp[3] = {-1, -1, -1};
     const char* ptr = color_str + 4;
     int i = 0;
diff --git a/cobalt/loader/cors_preflight.cc b/cobalt/loader/cors_preflight.cc
index 980f4d971f1b..718a2cc438aa 100644
--- a/cobalt/loader/cors_preflight.cc
+++ b/cobalt/loader/cors_preflight.cc
@@ -117,9 +117,15 @@ bool IsInArray(const char* input_str, const char* array[], size_t size) {
     return false;
   }
   for (size_t i = 0; i < size; ++i) {
+    #if SB_API_VERSION < 16
     if (SbStringCompareNoCase(input_str, array[i]) == 0) {
       return true;
     }
+    #else
+    if (strcasecmp(input_str, array[i]) == 0) {
+      return true;
+    }
+    #endif // SB_API_VERSION < 16
   }
   return false;
 }
@@ -132,10 +138,18 @@ bool HasFieldValue(const std::vector<std::string>& field_values,
     if (field_values[i].empty()) {
       continue;
     }
+    #if SB_API_VERSION < 16
     if (SbStringCompareNoCase(field_values[i].c_str(),
                               find_value_name.c_str()) == 0) {
       return true;
     }
+    #else
+    if (strcasecmp(field_values[i].c_str(),
+                              find_value_name.c_str()) == 0) {
+      return true;
+    }
+    #endif // SB_API_VERSION < 16
+    
   }
   return false;
 }
@@ -220,10 +234,17 @@ bool CORSPreflight::IsSafeResponseHeader(
   }
 
   for (size_t i = 0; i < CORS_exposed_header_name_list.size(); i++) {
+    #if SB_API_VERSION < 16
     if (SbStringCompareNoCase(CORS_exposed_header_name_list.at(i).c_str(),
                               name.c_str()) == 0) {
       return true;
     }
+    #else
+    if (strcasecmp(CORS_exposed_header_name_list.at(i).c_str(),
+                              name.c_str()) == 0) {
+      return true;
+    }
+    #endif //SB_API_VERSION < 16
   }
   return false;
 }
@@ -381,12 +402,22 @@ void CORSPreflight::OnURLFetchComplete(const net::URLFetcher* source) {
       if (HasFieldValue(headernames_vec, it.name())) {
         continue;
       }
+      #if SB_API_VERSION < 16
       if (SbStringCompareNoCase(it.name().c_str(), kAuthorization) == 0 ||
           (!HasFieldValue(headernames_vec, "*") &&
            !IsSafeRequestHeader(it.name(), it.value()))) {
         error_callback_.Run();
         return;
       }
+      #else
+      if (strcasecmp(it.name().c_str(), kAuthorization) == 0 ||
+          (!HasFieldValue(headernames_vec, "*") &&
+           !IsSafeRequestHeader(it.name(), it.value()))) {
+        error_callback_.Run();
+        return;
+      }
+      #endif //SB_API_VERSION < 16
+
     }
     // step 10-18 for adding entry to preflight cache.
     std::string max_age_str;
diff --git a/cobalt/loader/cors_preflight_cache.cc b/cobalt/loader/cors_preflight_cache.cc
index c16d31339679..6d09a4127ab1 100644
--- a/cobalt/loader/cors_preflight_cache.cc
+++ b/cobalt/loader/cors_preflight_cache.cc
@@ -127,10 +127,17 @@ bool CORSPreflightCache::HaveEntry(
   if (entry_ptr->allow_all_headers_except_non_wildcard) {
     bool has_auth_header = false;
     for (const auto& header : unsafe_headernames) {
+      #if SB_API_VERSION < 16
       if (SbStringCompareNoCase(header.c_str(), kAuthorization)) {
         has_auth_header = true;
         break;
       }
+      #else
+      if (strcasecmp(header.c_str(), kAuthorization)) {
+        has_auth_header = true;
+        break;
+      }
+      #endif //SB_API_VERSION < 16
     }
     // wildcard header is allowed if entry's allowed headers include it.
     return !has_auth_header ||
diff --git a/cobalt/loader/cors_preflight_cache.h b/cobalt/loader/cors_preflight_cache.h
index 6e063d5b18a2..48cdb7aeb9fe 100644
--- a/cobalt/loader/cors_preflight_cache.h
+++ b/cobalt/loader/cors_preflight_cache.h
@@ -54,7 +54,11 @@ class CORSPreflightCache : public base::RefCounted<CORSPreflightCache> {
   // Case-insensitive comparator.
   struct CaseInsensitiveCompare {
     bool operator()(const std::string& lhs, const std::string& rhs) const {
+      #if SB_API_VERSION < 16
       return SbStringCompareNoCase(lhs.c_str(), rhs.c_str()) < 0;
+      #else
+      return strcasecmp(lhs.c_str(), rhs.c_str()) < 0;
+      #endif //SB_API_VERSION < 16
     }
   };
 
diff --git a/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontMgr_cobalt.cc b/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontMgr_cobalt.cc
index b64037dd062d..b4e3197d18fa 100644
--- a/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontMgr_cobalt.cc
+++ b/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontMgr_cobalt.cc
@@ -307,9 +307,15 @@ void SkFontMgr_Cobalt::LoadLocaleDefault() {
   std::string script =
       icu::Locale::createCanonical(base::GetSystemLanguageScript().c_str())
           .getScript();
+  #if SB_API_VERSION < 16
   if (SbStringCompareNoCase(script.c_str(), ROBOTO_SCRIPT) == 0) {
     return;
   }
+  #else
+  if (strcasecmp(script.c_str(), ROBOTO_SCRIPT) == 0) {
+    return;
+  }
+  #endif // SB_API_VERSION < 16
 
   default_fonts_loaded_event_.Reset();
   for (int i = 0; i < families_.count(); i++) {
@@ -515,9 +521,15 @@ bool SkFontMgr_Cobalt::CheckIfFamilyMatchesLocaleScript(
   }
   std::string family_script =
       icu::Locale::createCanonical(family_tag.c_str()).getScript();
+  #if SB_API_VERSION < 16
   if (SbStringCompareNoCase(script, family_script.c_str()) != 0) {
     return false;
   }
+  #else
+  if (strcasecmp(script, family_script.c_str()) != 0) {
+    return false;
+  }
+  #endif //SB_API_VERSION < 16
 
   sk_sp<SkTypeface> check_typeface(
       new_family->MatchStyleWithoutLocking(SkFontStyle()));
diff --git a/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontStyleSet_cobalt.cc b/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontStyleSet_cobalt.cc
index 136b2e31bce3..c3d5b34e0367 100644
--- a/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontStyleSet_cobalt.cc
+++ b/cobalt/renderer/rasterizer/skia/skia/src/ports/SkFontStyleSet_cobalt.cc
@@ -232,6 +232,7 @@ SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt(
     ++extension;
 
     // Only add font formats that match the format setting.
+    #if SB_API_VERSION < 16
     if (font_format_setting == kTtf) {
       if (SbStringCompareNoCase("ttf", extension) != 0 &&
           SbStringCompareNoCase(extension, "ttc") != 0) {
@@ -241,6 +242,17 @@ SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt(
                SbStringCompareNoCase("woff2", extension) != 0) {
       continue;
     }
+    #else
+    if (font_format_setting == kTtf) {
+      if (strcasecmp("ttf", extension) != 0 &&
+          strcasecmp(extension, "ttc") != 0) {
+        continue;
+      }
+    } else if (font_format_setting == kWoff2 &&
+               strcasecmp("woff2", extension) != 0) {
+      continue;
+    }
+    #endif //SB_API_VERSION < 16
 
     SkFontStyle style(font_file.weight, SkFontStyle::kNormal_Width,
                       font_file.style == FontFileInfo::kItalic_FontStyle
@@ -272,6 +284,7 @@ SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt(
     int* index = styles_index_map.find(font_name);
     if (index != nullptr) {
       // If style with name already exists in family, replace it.
+      #if SB_API_VERSION < 16
       if (font_format_setting == kTtfPreferred &&
           SbStringCompareNoCase("ttf", extension) == 0) {
         styles_[*index].reset(font);
@@ -279,6 +292,15 @@ SkFontStyleSet_Cobalt::SkFontStyleSet_Cobalt(
                  SbStringCompareNoCase("woff2", extension) == 0) {
         styles_[*index].reset(font);
       }
+      #else
+      if (font_format_setting == kTtfPreferred &&
+          strcasecmp("ttf", extension) == 0) {
+        styles_[*index].reset(font);
+      } else if (font_format_setting == kWoff2Preferred &&
+                 strcasecmp("woff2", extension) == 0) {
+        styles_[*index].reset(font);
+      }
+      #endif //SB_API_VERSION < 16
     } else {
       int count = styles_.count();
       styles_index_map.set(font_name, count);
diff --git a/starboard/client_porting/poem/strings_poem.h b/starboard/client_porting/poem/strings_poem.h
index 7cab608fb3b2..7d7be2884962 100644
--- a/starboard/client_porting/poem/strings_poem.h
+++ b/starboard/client_porting/poem/strings_poem.h
@@ -23,10 +23,12 @@
 
 #include "starboard/string.h"
 
+#if SB_API_VERSION < 16
 #undef strcasecmp
 #define strcasecmp(s1, s2) SbStringCompareNoCase(s1, s2)
 #undef strncasecmp
 #define strncasecmp(s1, s2) SbStringCompareNoCaseN(s1, s2)
+#endif // SB_API_VERSION < 16
 
 #endif  // POEM_NO_EMULATION
 
diff --git a/starboard/elf_loader/exported_symbols.cc b/starboard/elf_loader/exported_symbols.cc
index d3bb80696d95..c0134d22a875 100644
--- a/starboard/elf_loader/exported_symbols.cc
+++ b/starboard/elf_loader/exported_symbols.cc
@@ -303,13 +303,11 @@ ExportedSymbols::ExportedSymbols() {
   REGISTER_SYMBOL(SbStorageOpenRecord);
   REGISTER_SYMBOL(SbStorageReadRecord);
   REGISTER_SYMBOL(SbStorageWriteRecord);
+#if SB_API_VERSION < 16
   REGISTER_SYMBOL(SbStringCompareNoCase);
   REGISTER_SYMBOL(SbStringCompareNoCaseN);
-
-#if SB_API_VERSION < 16
   REGISTER_SYMBOL(SbStringDuplicate);
-#endif  // #if SB_API_VERSION < 16
-
+#endif  // SB_API_VERSION < 16
   REGISTER_SYMBOL(SbStringFormat);
   REGISTER_SYMBOL(SbStringFormatWide);
   REGISTER_SYMBOL(SbStringScan);
diff --git a/starboard/shared/posix/string_compare_no_case.cc b/starboard/shared/posix/string_compare_no_case.cc
index 4837d888b2a9..79479e7eebe1 100644
--- a/starboard/shared/posix/string_compare_no_case.cc
+++ b/starboard/shared/posix/string_compare_no_case.cc
@@ -17,6 +17,8 @@
 #include <string.h>  // Non-standard, required for some platforms.
 #include <strings.h>
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCase(const char* string1, const char* string2) {
   return strcasecmp(string1, string2);
 }
+#endif
diff --git a/starboard/shared/posix/string_compare_no_case_n.cc b/starboard/shared/posix/string_compare_no_case_n.cc
index 75c9141a1afb..e56c4fb7ebce 100644
--- a/starboard/shared/posix/string_compare_no_case_n.cc
+++ b/starboard/shared/posix/string_compare_no_case_n.cc
@@ -17,8 +17,10 @@
 #include <string.h>  // Non-standard, required for some platforms.
 #include <strings.h>
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCaseN(const char* string1,
                            const char* string2,
                            size_t count) {
   return ::strncasecmp(string1, string2, count);
 }
+#endif
diff --git a/starboard/shared/starboard/media/mime_type.cc b/starboard/shared/starboard/media/mime_type.cc
index 4954ceeb318e..80b25f78f834 100644
--- a/starboard/shared/starboard/media/mime_type.cc
+++ b/starboard/shared/starboard/media/mime_type.cc
@@ -196,9 +196,15 @@ const std::string& MimeType::GetParamName(int index) const {
 
 int MimeType::GetParamIndexByName(const char* name) const {
   for (size_t i = 0; i < params_.size(); ++i) {
+    #if SB_API_VERSION < 16
     if (SbStringCompareNoCase(params_[i].name.c_str(), name) == 0) {
       return static_cast<int>(i);
     }
+    #else
+    if (strcasecmp(params_[i].name.c_str(), name) == 0) {
+      return static_cast<int>(i);
+    }
+    #endif // SB_API_VERSION < 16
   }
   return kInvalidParamIndex;
 }
diff --git a/starboard/shared/stub/string_compare_no_case.cc b/starboard/shared/stub/string_compare_no_case.cc
index 3434800b2d63..aa767bdb86be 100644
--- a/starboard/shared/stub/string_compare_no_case.cc
+++ b/starboard/shared/stub/string_compare_no_case.cc
@@ -14,6 +14,8 @@
 
 #include "starboard/common/string.h"
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCase(const char* string1, const char* string2) {
   return 0;
 }
+#endif
diff --git a/starboard/shared/stub/string_compare_no_case_n.cc b/starboard/shared/stub/string_compare_no_case_n.cc
index e04639e26939..aa7ae6323c75 100644
--- a/starboard/shared/stub/string_compare_no_case_n.cc
+++ b/starboard/shared/stub/string_compare_no_case_n.cc
@@ -14,8 +14,10 @@
 
 #include "starboard/common/string.h"
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCaseN(const char* string1,
                            const char* string2,
                            size_t count) {
   return 0;
 }
+#endif
diff --git a/starboard/shared/win32/string_compare_no_case.cc b/starboard/shared/win32/string_compare_no_case.cc
index 6021bf7d0ae1..85862f19f9ab 100644
--- a/starboard/shared/win32/string_compare_no_case.cc
+++ b/starboard/shared/win32/string_compare_no_case.cc
@@ -16,6 +16,8 @@
 
 #include <string.h>
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCase(const char* string1, const char* string2) {
   return _stricmp(string1, string2);
 }
+#endif
diff --git a/starboard/shared/win32/string_compare_no_case_n.cc b/starboard/shared/win32/string_compare_no_case_n.cc
index 7490d3d9c7ce..3ac38d73a953 100644
--- a/starboard/shared/win32/string_compare_no_case_n.cc
+++ b/starboard/shared/win32/string_compare_no_case_n.cc
@@ -16,8 +16,10 @@
 
 #include <string.h>
 
+#if SB_API_VERSION < 16
 int SbStringCompareNoCaseN(const char* string1,
                            const char* string2,
                            size_t count) {
   return _strnicmp(string1, string2, count);
 }
+#endif
diff --git a/third_party/musl/BUILD.gn b/third_party/musl/BUILD.gn
index 0c7d0578f439..3886d776441c 100644
--- a/third_party/musl/BUILD.gn
+++ b/third_party/musl/BUILD.gn
@@ -433,6 +433,7 @@ static_library("c_internal") {
     "src/string/rindex.c",
     "src/string/stpcpy.c",
     "src/string/stpncpy.c",
+    "src/string/strcasecmp.c",
     "src/string/strcat.c",
     "src/string/strchr.c",
     "src/string/strchrnul.c",
@@ -444,6 +445,7 @@ static_library("c_internal") {
     "src/string/strlcat.c",
     "src/string/strlcpy.c",
     "src/string/strlen.c",
+    "src/string/strncasecmp.c",
     "src/string/strncat.c",
     "src/string/strncmp.c",
     "src/string/strncpy.c",