diff --git a/README.md b/README.md
index d6144494..ce0f5089 100644
--- a/README.md
+++ b/README.md
@@ -565,7 +565,7 @@ The default template is `classic`.
     <td data-for="pagespeed">✔️</td>
     <td data-for="isocalendar">✔️</td>
     <td data-for="music">✔️</td>
-    <td data-for="languages">✔️</td>
+    <td data-for="languages"><span title="Use customs colors on @master">✔️<sup>N</sup></span></td>
     <td data-for="followup">✔️</td>
     <td data-for="topics">✔️</td>
     <td data-for="projects">✔️</td>
@@ -1015,6 +1015,22 @@ Add the following to your workflow:
     plugin_languages_skipped: "" # List of comma separated repositories to skip
 ```
 
+    🚧 Feature below is available as pre-release on @master branch (unstable)
+
+It is possible to use custom colors for languages if those provided by GitHub do not suit you by adding the following to your workflow:
+```yaml
+- uses: lowlighter/metrics@latest
+  with:
+    # ... other options
+    plugin_languages: yes
+    plugin_languages_colors: "0:orange, javascript:#ff0000, ..." # Make most used languages orange and JavaScript red
+```
+
+You can specify either an index with a color, or a language name (case insensitive) with a color.
+Colors can be either in hexadecimal format or a [named color](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value).
+
+Use the special value `rainbow` to use rainbow colors.
+
 </details>
 
 ### 🎟️ Follow-up
diff --git a/action.yml b/action.yml
index 40274ff1..2a1ae101 100644
--- a/action.yml
+++ b/action.yml
@@ -211,6 +211,17 @@ inputs:
     description: List of skipped repositories
     default: ""
 
+  # List of custom colors for specified languages
+  # Use this option when GitHub's color are too similar for your most used languages
+  #
+  # It is possible to use either hexadecimal colors or named colors
+  # - Use "rainbow" values for a predefined set of colors
+  # - Use `${n}:${color}` to change the color of the n-th most used language (e.g. "0:red" to make your most used language red)
+  # - Use `${language}:${color}` to change the color of named language (e.g. "javascript:red" to make JavaScript language red, language case is ignored)
+  plugin_languages_colors:
+    description: Custom languages colors
+    default: ""
+
   # Follow-up plugin
   # Display the number and the ratio of opened/closed issues and opened/merged pull requests on your repositories
   plugin_followup:
diff --git a/source/app/action/index.mjs b/source/app/action/index.mjs
index cf8b5e48..ee358cc4 100644
--- a/source/app/action/index.mjs
+++ b/source/app/action/index.mjs
@@ -166,7 +166,7 @@
           }
         //Languages
           if (plugins.languages.enabled) {
-            for (const option of ["ignored", "skipped"])
+            for (const option of ["ignored", "skipped", "colors"])
               info(`Languages ${option}`, q[`languages.${option}`] = input.array(`plugin_languages_${option}`))
           }
         //Habits
diff --git a/source/plugins/languages/index.mjs b/source/plugins/languages/index.mjs
index edf53d59..fed20962 100644
--- a/source/plugins/languages/index.mjs
+++ b/source/plugins/languages/index.mjs
@@ -6,11 +6,16 @@
           if ((!enabled)||(!q.languages))
             return null
         //Parameters override
-          let {"languages.ignored":ignored = "", "languages.skipped":skipped = ""} = q
+          let {"languages.ignored":ignored = "", "languages.skipped":skipped = "", "languages.colors":colors = ""} = q
           //Ignored languages
             ignored = decodeURIComponent(ignored).split(",").map(x => x.trim().toLocaleLowerCase()).filter(x => x)
           //Skipped repositories
             skipped = decodeURIComponent(skipped).split(",").map(x => x.trim().toLocaleLowerCase()).filter(x => x)
+          //Custom colors
+            if (`${colors}` === "rainbow")
+              colors = ["0:#ff0000", "1:#ffa500", "2:#ffff00", "3:#008000", "4:#0000ff", "5:#4b0082", "6:#ee82ee", "7:#162221"]
+            colors = Object.fromEntries(decodeURIComponent(colors).split(",").map(x => x.trim().toLocaleLowerCase()).filter(x => x).map(x => x.split(":").map(x => x.trim())))
+            console.debug(`metrics/compute/${login}/plugins > languages > custom colors ${JSON.stringify(colors)}`)
         //Iterate through user's repositories and retrieve languages data
           console.debug(`metrics/compute/${login}/plugins > languages > processing ${data.user.repositories.nodes.length} repositories`)
           const languages = {colors:{}, total:0, stats:{}}
@@ -29,7 +34,7 @@
                   }
                 //Update language stats
                   languages.stats[name] = (languages.stats[name] ?? 0) + size
-                  languages.colors[name] = color ?? "#ededed"
+                  languages.colors[name] = colors[name.toLocaleLowerCase()] ?? color ?? "#ededed"
                   languages.total += size
               }
           }
@@ -37,8 +42,11 @@
           console.debug(`metrics/compute/${login}/plugins > languages > computing stats`)
           Object.keys(languages.stats).map(name => languages.stats[name] /= languages.total)
           languages.favorites = Object.entries(languages.stats).sort(([an, a], [bn, b]) => b - a).slice(0, 8).map(([name, value]) => ({name, value, color:languages.colors[name], x:0}))
-          for (let i = 1; i < languages.favorites.length; i++)
-            languages.favorites[i].x = languages.favorites[i-1].x + languages.favorites[i-1].value
+          for (let i = 0; i < languages.favorites.length; i++) {
+            languages.favorites[i].x = (languages.favorites[i-1]?.x ?? 0) + (languages.favorites[i-1]?.value ?? 0)
+            if ((colors[i])&&(!colors[languages.favorites[i].name.toLocaleLowerCase()]))
+              languages.favorites[i].color = colors[i]
+          }
         //Results
           return languages
       }
diff --git a/tests/metrics.test.js b/tests/metrics.test.js
index bc16fe58..c7c8e250 100644
--- a/tests/metrics.test.js
+++ b/tests/metrics.test.js
@@ -138,10 +138,19 @@
       plugin_languages:true,
       plugin_languages_skipped:"metrics",
     }],
+    ["Language plugin (custom color set)", {
+      plugin_languages:true,
+      plugin_languages_colors:"0:ff0000,1:red",
+    }],
+    ["Language plugin (custom color set)", {
+      plugin_languages:true,
+      plugin_languages_colors:"rainbow",
+    }],
     ["Language plugin (complete)", {
       plugin_languages:true,
       plugin_languages_ignored:"html, css, dockerfile",
       plugin_languages_skipped:"metrics",
+      plugin_languages_colors:"rainbow",
     }],
     ["Follow-up plugin (default)", {
       plugin_followup:true,