diff --git a/src/tuxclocker-qt/Globals.hpp b/src/tuxclocker-qt/Globals.hpp
index a2e026b..db22c29 100644
--- a/src/tuxclocker-qt/Globals.hpp
+++ b/src/tuxclocker-qt/Globals.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <Settings.hpp>
+
 class DeviceModel;
 class QStackedWidget;
 class QWidget;
@@ -11,5 +13,7 @@ namespace Globals {
 extern DeviceModel *g_deviceModel;
 extern QStackedWidget *g_mainStack;
 extern QWidget *g_deviceBrowser;
+// When applying successfully, we need to know which profile to save changes to
+extern SettingsData g_settingsData;
 
 } // namespace Globals
diff --git a/src/tuxclocker-qt/Utils.cpp b/src/tuxclocker-qt/Utils.cpp
index 1063c21..88eb69a 100644
--- a/src/tuxclocker-qt/Utils.cpp
+++ b/src/tuxclocker-qt/Utils.cpp
@@ -5,6 +5,7 @@
 #include <functional>
 #include <QDebug>
 #include <QSettings>
+#include <Settings.hpp>
 
 namespace Utils {
 
@@ -77,4 +78,15 @@ void writeAssignableDefaults(DeviceModel &model) {
 	traverseModel(cb, &model);
 }
 
+void writeAssignableSetting(SettingsData data, QVariant value, NodePath assignablePath) {
+	if (!data.currentProfile.has_value())
+		return;
+
+	QSettings settings{"tuxclocker"};
+	auto profile = data.currentProfile.value();
+	settings.beginGroup("profiles");
+	settings.beginGroup(profile);
+	settings.setValue(toSettingsPath(assignablePath), value);
+}
+
 } // namespace Utils
diff --git a/src/tuxclocker-qt/Utils.hpp b/src/tuxclocker-qt/Utils.hpp
index f3b47da..c28ec56 100644
--- a/src/tuxclocker-qt/Utils.hpp
+++ b/src/tuxclocker-qt/Utils.hpp
@@ -2,6 +2,8 @@
 
 #include <DeviceModel.hpp>
 
+class SettingsData;
+
 namespace Utils {
 
 using ModelTraverseCallback =
@@ -15,5 +17,6 @@ QString toSettingsPath(NodePath);
 void traverseModel(
     const ModelTraverseCallback &, QAbstractItemModel *, const QModelIndex &parent = QModelIndex());
 void writeAssignableDefaults(DeviceModel &model);
+void writeAssignableSetting(SettingsData, QVariant value, NodePath assignablePath);
 
 } // namespace Utils
diff --git a/src/tuxclocker-qt/data/AssignableProxy.hpp b/src/tuxclocker-qt/data/AssignableProxy.hpp
index 53ab3ea..53b087f 100644
--- a/src/tuxclocker-qt/data/AssignableProxy.hpp
+++ b/src/tuxclocker-qt/data/AssignableProxy.hpp
@@ -20,7 +20,9 @@ public:
 	void apply();
 	// Stop connection and clear current connection
 	void stopConnection();
+	// TODO: rename to setTargetValue for congruency
 	void setValue(QVariant v) { m_value = v; }
+	QVariant targetValue() { return m_value; }
 	std::optional<TC::Device::AssignmentArgument> currentValue();
 	QString dbusPath();
 signals:
diff --git a/src/tuxclocker-qt/data/DeviceModel.cpp b/src/tuxclocker-qt/data/DeviceModel.cpp
index 50915f8..b256327 100644
--- a/src/tuxclocker-qt/data/DeviceModel.cpp
+++ b/src/tuxclocker-qt/data/DeviceModel.cpp
@@ -3,6 +3,8 @@
 #include "AssignableProxy.hpp"
 #include "DynamicReadableProxy.hpp"
 #include <fplus/fplus.hpp>
+#include <Globals.hpp>
+#include <Utils.hpp>
 #include <QApplication>
 #include <QDBusReply>
 #include <QDebug>
@@ -172,8 +174,16 @@ QStandardItem *DeviceModel::createAssignable(
 	connect(proxy, &AssignableProxy::applied, [=](auto err) {
 		ifaceItem->applyTargetText();
 
+		bool success = !err.has_value();
+
+		if (success) {
+			// Write successfully changed value to settings
+			Utils::writeAssignableSetting(
+			    Globals::g_settingsData, proxy->targetValue(), proxy->dbusPath());
+		}
+
 		// Fade out result color
-		auto startColor = (err.has_value()) ? errorColor() : successColor();
+		auto startColor = !success ? errorColor() : successColor();
 		auto anim = new QVariantAnimation;
 		anim->setDuration(fadeOutTime());
 		anim->setStartValue(startColor);
diff --git a/src/tuxclocker-qt/widgets/DeviceBrowser.cpp b/src/tuxclocker-qt/widgets/DeviceBrowser.cpp
index e6e9230..5b049b6 100644
--- a/src/tuxclocker-qt/widgets/DeviceBrowser.cpp
+++ b/src/tuxclocker-qt/widgets/DeviceBrowser.cpp
@@ -58,6 +58,9 @@ DeviceBrowser::DeviceBrowser(DeviceModel &model, QWidget *parent)
 
 			connect(m_settings, &Settings::cancelled,
 			    [=] { Globals::g_mainStack->setCurrentWidget(this); });
+
+			connect(m_settings, &Settings::settingsSaved,
+			    [=](auto) { Globals::g_mainStack->setCurrentWidget(this); });
 		}
 		Globals::g_mainStack->setCurrentWidget(m_settings);
 	});
diff --git a/src/tuxclocker-qt/widgets/Settings.cpp b/src/tuxclocker-qt/widgets/Settings.cpp
index f00e5a8..56f3cb6 100644
--- a/src/tuxclocker-qt/widgets/Settings.cpp
+++ b/src/tuxclocker-qt/widgets/Settings.cpp
@@ -1,10 +1,14 @@
 #include "Settings.hpp"
 
+#include <Globals.hpp>
 #include <QCheckBox>
 #include <QGridLayout>
 #include <QLabel>
 #include <QListWidget>
 #include <QPushButton>
+#include <QSettings>
+
+SettingsData Globals::g_settingsData;
 
 Settings::Settings(QWidget *parent) : QWidget(parent) {
 	auto layout = new QGridLayout{this};
@@ -18,15 +22,15 @@ Settings::Settings(QWidget *parent) : QWidget(parent) {
 	label->setFont(biggerPoint);
 	label->setText("Settings");
 
-	auto autoLoadCheck = new QCheckBox{"Apply profile settings automatically", this};
+	m_autoLoad = new QCheckBox{"Apply profile settings automatically", this};
 
 	auto profileCheck = new QCheckBox{"Use profile", this};
 
 	// TODO: add delegate to make deleting a little nicer
-	auto profileView = new QListWidget{this};
+	m_profileView = new QListWidget{this};
 	auto triggers = QAbstractItemView::SelectedClicked | QAbstractItemView::EditKeyPressed;
-	profileView->setEditTriggers(triggers);
-	profileView->setEnabled(false);
+	m_profileView->setEditTriggers(triggers);
+	m_profileView->setEnabled(false);
 
 	auto addButton = new QPushButton{"Add profile"};
 	addButton->setEnabled(false);
@@ -36,17 +40,17 @@ Settings::Settings(QWidget *parent) : QWidget(parent) {
 	connect(addButton, &QPushButton::released, [=] {
 		auto item = new QListWidgetItem{"Unnamed"};
 		item->setFlags(item->flags() | Qt::ItemIsEditable);
-		profileView->addItem(item);
+		m_profileView->addItem(item);
 	});
 
 	connect(removeButton, &QPushButton::released,
-	    [=] { profileView->model()->removeRow(profileView->currentRow()); });
+	    [=] { m_profileView->model()->removeRow(m_profileView->currentRow()); });
 
 	connect(profileCheck, &QCheckBox::stateChanged, [=](auto state) {
 		bool enable = (state == Qt::Unchecked) ? false : true;
 
 		addButton->setEnabled(enable);
-		profileView->setEnabled(enable);
+		m_profileView->setEnabled(enable);
 	});
 
 	auto cancelButton = new QPushButton{"Cancel", this};
@@ -55,10 +59,20 @@ Settings::Settings(QWidget *parent) : QWidget(parent) {
 
 	auto saveButton = new QPushButton{"Save", this};
 
+	connect(saveButton, &QPushButton::released, this, [=] {
+		// TODO: read assignableSettings from disk
+		auto settingsData = fromUIState();
+		writeSettings(fromUIState());
+
+		Globals::g_settingsData = settingsData;
+
+		emit settingsSaved(settingsData);
+	});
+
 	layout->addWidget(label, 0, 0, 1, 1, Qt::AlignLeft | Qt::AlignTop);
-	layout->addWidget(autoLoadCheck, 1, 0, 1, 1, Qt::AlignLeft);
+	layout->addWidget(m_autoLoad, 1, 0, 1, 1, Qt::AlignLeft);
 	layout->addWidget(profileCheck, 2, 0, 1, 1, Qt::AlignLeft);
-	layout->addWidget(profileView, 2, 1, 1, 2);
+	layout->addWidget(m_profileView, 2, 1, 1, 2);
 	layout->addWidget(addButton, 3, 1);
 	layout->addWidget(removeButton, 3, 2);
 	layout->addWidget(cancelButton, 4, 0, 1, 1, Qt::AlignBottom);
@@ -66,3 +80,29 @@ Settings::Settings(QWidget *parent) : QWidget(parent) {
 
 	this->setLayout(layout);
 }
+
+SettingsData Settings::fromUIState() {
+	std::optional<QString> currentProfile = std::nullopt;
+
+	auto data = m_profileView->currentItem()->data(Qt::DisplayRole);
+	if (data.isValid())
+		currentProfile = data.toString();
+
+	return SettingsData{
+	    .autoApplyProfile = m_autoLoad->isChecked(),
+	    .currentProfile = currentProfile,
+	};
+}
+
+void Settings::writeSettings(SettingsData data) {
+	bool usingProfile = data.currentProfile.has_value() ? true : false;
+
+	QSettings settings{"tuxclocker"};
+	settings.beginGroup("general");
+
+	settings.setValue("autoApplyProfile", data.autoApplyProfile);
+	settings.setValue("usingProfile", usingProfile);
+
+	if (usingProfile)
+		settings.setValue("currentProfile", data.currentProfile.value());
+}
diff --git a/src/tuxclocker-qt/widgets/Settings.hpp b/src/tuxclocker-qt/widgets/Settings.hpp
index edfcccf..474701e 100644
--- a/src/tuxclocker-qt/widgets/Settings.hpp
+++ b/src/tuxclocker-qt/widgets/Settings.hpp
@@ -4,6 +4,9 @@
 #include <QVariant>
 #include <QWidget>
 
+class QCheckBox;
+class QListWidget;
+
 // TODO: duplicate definition
 struct AssignableSetting {
 	QString assignablePath;
@@ -21,6 +24,14 @@ public:
 	explicit Settings(QWidget *parent = nullptr);
 signals:
 	void cancelled();
+	void settingsSaved(SettingsData);
 private:
+	SettingsData fromUIState();
+	void writeSettings(SettingsData);
+
+	QCheckBox *m_autoLoad;
+	QCheckBox *m_useProfile;
+	QListWidget *m_profileView;
+
 	Q_OBJECT
 };