diff --git a/packages/builder/src/builderStore/store/frontend.js b/packages/builder/src/builderStore/store/frontend.js
index 192ade9e5d..7d0b9d0547 100644
--- a/packages/builder/src/builderStore/store/frontend.js
+++ b/packages/builder/src/builderStore/store/frontend.js
@@ -41,6 +41,8 @@ const INITIAL_FRONTEND_STATE = {
     spectrumThemes: false,
     intelligentLoading: false,
     deviceAwareness: false,
+    state: false,
+    customThemes: false,
   },
   currentFrontEndType: "none",
   selectedScreenId: "",
@@ -53,6 +55,7 @@ const INITIAL_FRONTEND_STATE = {
   routes: {},
   clientLibPath: "",
   theme: "",
+  customTheme: {},
 }
 
 export const getFrontendStore = () => {
@@ -77,6 +80,7 @@ export const getFrontendStore = () => {
         layouts,
         screens,
         theme: application.theme || "spectrum--light",
+        customTheme: application.customTheme,
         hasAppPackage: true,
         appInstance: application.instance,
         clientLibPath,
@@ -110,6 +114,22 @@ export const getFrontendStore = () => {
         }
       },
     },
+    customTheme: {
+      save: async customTheme => {
+        const appId = get(store).appId
+        const response = await api.put(`/api/applications/${appId}`, {
+          customTheme,
+        })
+        if (response.status === 200) {
+          store.update(state => {
+            state.customTheme = customTheme
+            return state
+          })
+        } else {
+          throw new Error("Error updating theme")
+        }
+      },
+    },
     routing: {
       fetch: async () => {
         const response = await api.get("/api/routing")
diff --git a/packages/builder/src/components/design/AppPreview/AppThemeSelect.svelte b/packages/builder/src/components/design/AppPreview/AppThemeSelect.svelte
index 21dae25708..09041dbf5a 100644
--- a/packages/builder/src/components/design/AppPreview/AppThemeSelect.svelte
+++ b/packages/builder/src/components/design/AppPreview/AppThemeSelect.svelte
@@ -33,6 +33,7 @@
 
 <style>
   div {
+    width: 100px;
     padding-right: 8px;
   }
 </style>
diff --git a/packages/builder/src/components/design/AppPreview/CurrentItemPreview.svelte b/packages/builder/src/components/design/AppPreview/CurrentItemPreview.svelte
index 38441d4323..85fb086b59 100644
--- a/packages/builder/src/components/design/AppPreview/CurrentItemPreview.svelte
+++ b/packages/builder/src/components/design/AppPreview/CurrentItemPreview.svelte
@@ -49,6 +49,7 @@
     selectedComponentId,
     previewType: $store.currentFrontEndType,
     theme: $store.theme,
+    customTheme: $store.customTheme,
   }
 
   // Saving pages and screens to the DB causes them to have _revs.
diff --git a/packages/builder/src/components/design/AppPreview/ThemeEditor.svelte b/packages/builder/src/components/design/AppPreview/ThemeEditor.svelte
new file mode 100644
index 0000000000..6ea82e2713
--- /dev/null
+++ b/packages/builder/src/components/design/AppPreview/ThemeEditor.svelte
@@ -0,0 +1,76 @@
+<script>
+  import { get } from "svelte/store"
+  import {
+    ActionButton,
+    Modal,
+    ModalContent,
+    Layout,
+    ColorPicker,
+    Label,
+  } from "@budibase/bbui"
+  import { store } from "builderStore"
+
+  let modal
+
+  const defaultTheme = {
+    primaryColor: "var(--spectrum-global-color-blue-600)",
+    primaryColorHover: "var(--spectrum-global-color-blue-500)",
+  }
+
+  const updateProperty = property => {
+    return e => {
+      store.actions.customTheme.save({
+        ...get(store).customTheme,
+        [property]: e.detail,
+      })
+    }
+  }
+</script>
+
+<div class="container">
+  <ActionButton icon="Brush" on:click={modal.show}>Edit</ActionButton>
+</div>
+<Modal bind:this={modal}>
+  <ModalContent
+    showConfirmButton={false}
+    cancelText="Close"
+    showCloseIcon={false}
+    title="Theme settings"
+  >
+    <Layout noPadding gap="XS">
+      <div class="setting">
+        <Label size="L">Primary Color</Label>
+        <ColorPicker
+          value={$store.customTheme?.primaryColor || defaultTheme.primaryColor}
+          on:change={updateProperty("primaryColor")}
+        />
+      </div>
+      <div class="setting">
+        <Label size="L">Primary Color (Hover)</Label>
+        <ColorPicker
+          value={$store.customTheme?.primaryColorHover ||
+            defaultTheme.primaryColorHover}
+          on:change={updateProperty("primaryColorHover")}
+        />
+      </div>
+    </Layout>
+  </ModalContent>
+</Modal>
+
+<style>
+  .container {
+    padding-right: 8px;
+  }
+  .setting {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: center;
+    padding-bottom: var(--spectrum-global-dimension-static-size-100);
+    border-bottom: var(--border-light);
+  }
+  .setting:last-child {
+    padding-bottom: 0;
+    border-bottom: none;
+  }
+</style>
diff --git a/packages/builder/src/components/design/AppPreview/iframeTemplate.js b/packages/builder/src/components/design/AppPreview/iframeTemplate.js
index 1e3ff7c856..85f008df08 100644
--- a/packages/builder/src/components/design/AppPreview/iframeTemplate.js
+++ b/packages/builder/src/components/design/AppPreview/iframeTemplate.js
@@ -66,7 +66,8 @@ export default `
           screen,
           previewType,
           appId,
-          theme
+          theme,
+          customTheme
         } = parsed
 
         // Set some flags so the app knows we're in the builder
@@ -78,6 +79,7 @@ export default `
         window["##BUDIBASE_PREVIEW_ID##"] = Math.random()
         window["##BUDIBASE_PREVIEW_TYPE##"] = previewType
         window["##BUDIBASE_PREVIEW_THEME##"] = theme
+        window["##BUDIBASE_PREVIEW_CUSTOM_THEME##"] = customTheme
 
         // Initialise app
         try {
diff --git a/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/EventEditor.svelte b/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/EventEditor.svelte
index 4ff746a034..d0c561546f 100644
--- a/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/EventEditor.svelte
+++ b/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/EventEditor.svelte
@@ -9,11 +9,12 @@
     ActionMenu,
     MenuItem,
   } from "@budibase/bbui"
-  import actionTypes from "./actions"
+  import { getAvailableActions } from "./actions"
   import { generate } from "shortid"
 
   const flipDurationMs = 150
   const EVENT_TYPE_KEY = "##eventHandlerType"
+  const actionTypes = getAvailableActions()
 
   export let actions
   export let bindings = []
diff --git a/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/actions/index.js b/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/actions/index.js
index 6c285939ac..eaab22d89d 100644
--- a/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/actions/index.js
+++ b/packages/builder/src/components/design/PropertiesPanel/PropertyControls/EventsEditor/actions/index.js
@@ -1,3 +1,6 @@
+import { store } from "builderStore"
+import { get } from "svelte/store"
+
 import NavigateTo from "./NavigateTo.svelte"
 import SaveRow from "./SaveRow.svelte"
 import DeleteRow from "./DeleteRow.svelte"
@@ -17,49 +20,56 @@ import UpdateStateStep from "./UpdateState.svelte"
 // be considered as camel case too.
 // There is technical debt here to sanitize all these and standardise them
 // across the packages but it's a breaking change to existing apps.
-export default [
-  {
-    name: "Save Row",
-    component: SaveRow,
-  },
-  {
-    name: "Delete Row",
-    component: DeleteRow,
-  },
-  {
-    name: "Navigate To",
-    component: NavigateTo,
-  },
-  {
-    name: "Execute Query",
-    component: ExecuteQuery,
-  },
-  {
-    name: "Trigger Automation",
-    component: TriggerAutomation,
-  },
-  {
-    name: "Validate Form",
-    component: ValidateForm,
-  },
-  {
-    name: "Log Out",
-    component: LogOut,
-  },
-  {
-    name: "Clear Form",
-    component: ClearForm,
-  },
-  {
-    name: "Close Screen Modal",
-    component: CloseScreenModal,
-  },
-  {
-    name: "Change Form Step",
-    component: ChangeFormStep,
-  },
-  {
-    name: "Update State",
-    component: UpdateStateStep,
-  },
-]
+export const getAvailableActions = () => {
+  let actions = [
+    {
+      name: "Save Row",
+      component: SaveRow,
+    },
+    {
+      name: "Delete Row",
+      component: DeleteRow,
+    },
+    {
+      name: "Navigate To",
+      component: NavigateTo,
+    },
+    {
+      name: "Execute Query",
+      component: ExecuteQuery,
+    },
+    {
+      name: "Trigger Automation",
+      component: TriggerAutomation,
+    },
+    {
+      name: "Validate Form",
+      component: ValidateForm,
+    },
+    {
+      name: "Log Out",
+      component: LogOut,
+    },
+    {
+      name: "Clear Form",
+      component: ClearForm,
+    },
+    {
+      name: "Close Screen Modal",
+      component: CloseScreenModal,
+    },
+    {
+      name: "Change Form Step",
+      component: ChangeFormStep,
+    },
+  ]
+
+  if (get(store).clientFeatures?.state) {
+    actions.push({
+      name: "Update State",
+      component: UpdateStateStep,
+    })
+  }
+
+  return actions
+}
diff --git a/packages/builder/src/pages/builder/app/[application]/design/[assetType]/_layout.svelte b/packages/builder/src/pages/builder/app/[application]/design/[assetType]/_layout.svelte
index 207daae84a..b5d1a8df11 100644
--- a/packages/builder/src/pages/builder/app/[application]/design/[assetType]/_layout.svelte
+++ b/packages/builder/src/pages/builder/app/[application]/design/[assetType]/_layout.svelte
@@ -14,6 +14,7 @@
   import { findComponent, findComponentPath } from "builderStore/storeUtils"
   import { get } from "svelte/store"
   import AppThemeSelect from "components/design/AppPreview/AppThemeSelect.svelte"
+  import ThemeEditor from "components/design/AppPreview/ThemeEditor.svelte"
 
   // Cache previous values so we don't update the URL more than necessary
   let previousType
@@ -153,6 +154,9 @@
         {#if $store.clientFeatures.spectrumThemes}
           <AppThemeSelect />
         {/if}
+        {#if $store.clientFeatures.customThemes}
+          <ThemeEditor />
+        {/if}
       </div>
       <div class="preview-content">
         {#key $store.version}
@@ -202,9 +206,18 @@
     padding: var(--spacing-xl) 40px;
   }
   .preview-header {
-    display: grid;
-    grid-template-columns: 1fr 100px;
+    display: flex;
+    flex-direction: row;
+    justify-content: flex-start;
+    align-items: center;
   }
+  .preview-header > :global(*) {
+    flex: 0 0 auto;
+  }
+  .preview-header > :global(*:first-child) {
+    flex: 1 1 auto;
+  }
+
   .preview-content {
     flex: 1 1 auto;
   }
diff --git a/packages/client/manifest.json b/packages/client/manifest.json
index 194706744d..51ae1cf30d 100644
--- a/packages/client/manifest.json
+++ b/packages/client/manifest.json
@@ -2,7 +2,9 @@
   "features": {
     "spectrumThemes": true,
     "intelligentLoading": true,
-    "deviceAwareness": true
+    "deviceAwareness": true,
+    "state": true,
+    "customThemes": true
   },
   "layout": {
     "name": "Layout",
diff --git a/packages/client/src/components/ClientApp.svelte b/packages/client/src/components/ClientApp.svelte
index cdc39ac225..4c494f9104 100644
--- a/packages/client/src/components/ClientApp.svelte
+++ b/packages/client/src/components/ClientApp.svelte
@@ -11,7 +11,7 @@
     authStore,
     routeStore,
     builderStore,
-    appStore,
+    themeStore,
   } from "stores"
   import NotificationDisplay from "components/overlay/NotificationDisplay.svelte"
   import ConfirmationDisplay from "components/overlay/ConfirmationDisplay.svelte"
@@ -63,9 +63,6 @@
       }
     }
   }
-
-  $: themeClass =
-    $builderStore.theme || $appStore.application?.theme || "spectrum--light"
 </script>
 
 {#if dataLoaded}
@@ -73,7 +70,7 @@
     id="spectrum-root"
     lang="en"
     dir="ltr"
-    class="spectrum spectrum--medium {themeClass}"
+    class="spectrum spectrum--medium {$themeStore.theme}"
   >
     {#if permissionError}
       <div class="error">
@@ -87,7 +84,11 @@
       <UserBindingsProvider>
         <DeviceBindingsProvider>
           <StateBindingsProvider>
-            <div id="app-root" class:preview={$builderStore.inBuilder}>
+            <div
+              id="app-root"
+              class:preview={$builderStore.inBuilder}
+              style={$themeStore.customThemeCss}
+            >
               {#key $screenStore.activeLayout._id}
                 <Component instance={$screenStore.activeLayout.props} />
               {/key}
@@ -132,6 +133,20 @@
     border: 1px solid var(--spectrum-global-color-gray-300);
   }
 
+  #app-root {
+    /*  Primary */
+    --spectrum-global-color-blue-600: var(--primaryColor);
+    --spectrum-global-color-blue-700: var(--primaryColor);
+    --spectrum-global-color-static-blue-600: var(--primaryColor);
+    --spectrum-global-color-static-blue-700: var(--primaryColor);
+
+    /*  Primary hover */
+    --spectrum-global-color-blue-400: var(--primaryColorHover);
+    --spectrum-global-color-blue-500: var(--primaryColorHover);
+    --spectrum-global-color-static-blue-400: var(--primaryColorHover);
+    --spectrum-global-color-static-blue-500: var(--primaryColorHover);
+  }
+
   /* Custom scrollbars */
   :global(::-webkit-scrollbar) {
     width: 8px;
diff --git a/packages/client/src/index.js b/packages/client/src/index.js
index ceae36c9f3..2d1c9fd1c0 100644
--- a/packages/client/src/index.js
+++ b/packages/client/src/index.js
@@ -17,6 +17,7 @@ const loadBudibase = () => {
     previewId: window["##BUDIBASE_PREVIEW_ID##"],
     previewType: window["##BUDIBASE_PREVIEW_TYPE##"],
     theme: window["##BUDIBASE_PREVIEW_THEME##"],
+    customTheme: window["##BUDIBASE_PREVIEW_CUSTOM_THEME##"],
   })
 
   // Set app ID - this window flag is set by both the preview and the real
diff --git a/packages/client/src/stores/index.js b/packages/client/src/stores/index.js
index 6c99e3f453..02c848120c 100644
--- a/packages/client/src/stores/index.js
+++ b/packages/client/src/stores/index.js
@@ -8,6 +8,7 @@ export { dataSourceStore } from "./dataSource"
 export { confirmationStore } from "./confirmation"
 export { peekStore } from "./peek"
 export { stateStore } from "./state"
+export { themeStore } from "./theme"
 
 // Context stores are layered and duplicated, so it is not a singleton
 export { createContextStore } from "./context"
diff --git a/packages/client/src/stores/theme.js b/packages/client/src/stores/theme.js
new file mode 100644
index 0000000000..821c41ccc7
--- /dev/null
+++ b/packages/client/src/stores/theme.js
@@ -0,0 +1,30 @@
+import { derived } from "svelte/store"
+import { appStore } from "./app"
+import { builderStore } from "./builder"
+
+const createThemeStore = () => {
+  const store = derived(
+    [builderStore, appStore],
+    ([$builderStore, $appStore]) => {
+      const theme =
+        $builderStore.theme || $appStore.application?.theme || "spectrum--light"
+      const customTheme =
+        $builderStore.customTheme || $appStore.application?.customTheme || {}
+      let customThemeCss = ""
+      Object.entries(customTheme).forEach(([key, value]) => {
+        customThemeCss += `--${key}:${value};`
+      })
+      return {
+        theme,
+        customTheme,
+        customThemeCss,
+      }
+    }
+  )
+
+  return {
+    subscribe: store.subscribe,
+  }
+}
+
+export const themeStore = createThemeStore()