diff --git a/README.md b/README.md
index da971e1..db56f7a 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,13 @@ Build with a custom config file:
 CONFIG_PATH='config.customName.json' npm run build
 ```
 
+### Theme checker
+
+The [Hubl theme manager](https://cdn.startinblox.com/hubl/theme/) is very handy for customer to easily customize the main colors they want to use.
+But developers should verify that their development use those colors to fit the customer wishes. The theme checker make this task easier :
+just add `"themeChecker": true` to the config.json to display the color picker tool in the header bar. Changing the color will set them on the
+whole app so that you can verify that your development take them into account correctly.
+
 ## Mandatory modules
 
 By default, a Hubl includes only individual chat modules.
diff --git a/src/dependencies.pug b/src/dependencies.pug
index 88d7a8f..a02ed06 100644
--- a/src/dependencies.pug
+++ b/src/dependencies.pug
@@ -10,6 +10,10 @@ script(type="module" src="https://cdn.skypack.dev/@startinblox/router@0.11" defe
 script(type="module" src="https://cdn.skypack.dev/@startinblox/component-notifications@0.9" defer)
 //- script(type="module" src="/lib/sib-notifications/index.js" defer)
 
+if themeChecker
+    script(src="https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/pickr.min.js")
+    link(rel='stylesheet', href='https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/themes/nano.min.css')
+
 if endpoints.get
   if endpoints.get.events && endpoints.get.typeevents
       script(type="module" src="https://cdn.skypack.dev/@startinblox/component-event@1.4" defer)
diff --git a/src/scripts/theme-checker.js b/src/scripts/theme-checker.js
new file mode 100644
index 0000000..b6f2d67
--- /dev/null
+++ b/src/scripts/theme-checker.js
@@ -0,0 +1,97 @@
+document.addEventListener("DOMContentLoaded", () => {
+
+    if( !document.querySelector('.input-color') ) return
+    const params = new URLSearchParams(window.location.search);
+    const currentPrimary = getComputedStyle(document.documentElement).getPropertyValue('--color-primary')
+    const defaultPrimary = params.has('p') ? "#" + params.get('p') : currentPrimary ? currentPrimary.trim() : "#FF0055";
+    document.documentElement.style.setProperty('--color-primary', defaultPrimary);
+    const cP = Pickr.create({
+        el: '.input-color#color-primary',
+        theme: 'nano',
+        default: defaultPrimary,
+        defaultRepresentation: 'HEX',
+        swatches: null,
+        components: {
+            hue: true,
+            preview: true,
+            palette: true,
+            interaction: {
+                input: true
+            }
+        }
+    });
+    cP.on('change', (color, evt) => {
+        document.documentElement.style.setProperty('--color-primary', color.toHEXA());
+        params.set('p', String(color.toHEXA()).substr(1));
+        cP.applyColor();
+    });
+    const currentSecondary = getComputedStyle(document.documentElement).getPropertyValue('--color-secondary')
+    const defaultSecondary = params.has('s') ? "#" + params.get('s') : currentSecondary ? currentSecondary.trim() : "#314560";
+    document.documentElement.style.setProperty('--color-secondary', defaultSecondary);
+    const cS = Pickr.create({
+        el: '.input-color#color-secondary',
+        theme: 'nano',
+        default: defaultSecondary,
+        defaultRepresentation: 'HEX',
+        swatches: null,
+        components: {
+            hue: true,
+            preview: true,
+            palette: true,
+            interaction: {
+                input: true
+            }
+        }
+    });
+    cS.on('change', (color, evt) => {
+        document.documentElement.style.setProperty('--color-secondary', color.toHEXA());
+        params.set('s', String(color.toHEXA()).substr(1));
+        cS.applyColor();
+    });
+    const currentComplementary = getComputedStyle(document.documentElement).getPropertyValue('--color-complementary')
+    const defaultComplementary = params.has('c') ? "#" + params.get('c') : currentComplementary ? currentComplementary.trim() : "#00E3B4";
+    document.documentElement.style.setProperty('--color-complementary', defaultComplementary);
+    const cC = Pickr.create({
+        el: '.input-color#color-complementary',
+        theme: 'nano',
+        default: defaultComplementary,
+        defaultRepresentation: 'HEX',
+        swatches: null,
+        components: {
+            hue: true,
+            preview: true,
+            palette: true,
+            interaction: {
+                input: true
+            }
+        }
+    });
+    cC.on('change', (color, evt) => {
+        document.documentElement.style.setProperty('--color-complementary', color.toHEXA());
+        params.set('c', String(color.toHEXA()).substr(1));
+        cC.applyColor();
+    });
+    const currentComplementaryDarken = getComputedStyle(document.documentElement).getPropertyValue('--color-complementary-darken')
+    const defaultComplementaryDarken = params.has('cd') ? "#" + params.get('cd') : currentComplementaryDarken ? currentComplementaryDarken.trim() : "#0068FF";
+    document.documentElement.style.setProperty('--color-complementary-darken', defaultComplementaryDarken);
+    const cCd = Pickr.create({
+        el: '.input-color#color-complementary-darken',
+        theme: 'nano',
+        default: defaultComplementaryDarken,
+        defaultRepresentation: 'HEX',
+        swatches: null,
+        components: {
+            hue: true,
+            preview: true,
+            palette: true,
+            interaction: {
+                input: true
+            }
+        }
+    });
+    cCd.on('change', (color, evt) => {
+        document.documentElement.style.setProperty('--color-complementary-darken', color.toHEXA());
+        params.set('cd', String(color.toHEXA()).substr(1));
+        cCd.applyColor();
+    });
+});
diff --git a/src/styles/base/header.scss b/src/styles/base/header.scss
index cbc0b8f..15958a0 100644
--- a/src/styles/base/header.scss
+++ b/src/styles/base/header.scss
@@ -71,6 +71,22 @@
   solid-notifications-template[data-rdf-type='foaf:user'] {
     position: absolute;
   }
+
+  .selector {
+    display: flex;
+    width: 30%;
+    justify-content: space-around;
+
+    input {
+      height: 2em;
+      width: 2em;
+      padding: 0;
+      border: solid thin;
+    }
+    label {
+      text-align: center;
+    }
+  }
 }
   
 /* General styling for both notification and user's panel */
diff --git a/src/views/partials/header.pug b/src/views/partials/header.pug
index b49ad92..ae765db 100644
--- a/src/views/partials/header.pug
+++ b/src/views/partials/header.pug
@@ -5,6 +5,16 @@
 
   span.beta-tag(data-trans='header.beta')
 
+if themeChecker
+  div.selector
+    each val, index in ['primary', 'secondary', 'complementary', 'complementary-darken']
+      label= 'Couleur ' + (index+1)
+        input.input-color(
+          id='color-'+val
+          type="text"
+        )
+
+
 solid-notifications.notLoggedIn(
   nested-field="inbox"
   bind-user