diff --git a/src/frames/mainwindow.cpp b/src/frames/mainwindow.cpp
index 25ca5f8..c98c5b8 100644
--- a/src/frames/mainwindow.cpp
+++ b/src/frames/mainwindow.cpp
@@ -1,8 +1,15 @@
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 
+#define PRIORITIES_KEY "priorities"
+#define STATUS_KEY "status"
+#define BOARDS_KEY "boards"
+
 #include <QUuid>
 #include <QColor>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QMessageBox>
 
 #include "prefdialog.h"
 #include "aboutdialog.h"
@@ -15,6 +22,7 @@ MainWindow::MainWindow(QWidget *parent)
     , ui(new Ui::MainWindow)
 {
     ui->setupUi(this);
+    init();
     this->selectedBoardIndex = -1;
     connect(ui->actionPreferences, &QAction::triggered, this, &MainWindow::openPreferences);
     connect(ui->actionAbout, &QAction::triggered, this, &MainWindow::openAbout);
@@ -22,8 +30,6 @@ MainWindow::MainWindow(QWidget *parent)
     connect(ui->listWidget, &QListWidget::currentRowChanged, this, &MainWindow::onBoardSelected);
     connect(ui->actionNew_task, &QAction::triggered, this, &MainWindow::onNewTaskClick);
     connect(ui->treeWidget, &QTreeWidget::itemDoubleClicked, this, &MainWindow::onEditTask);
-    this->priorities = defaultPriorities();
-    this->status = defaultStatus();
 }
 
 MainWindow::~MainWindow()
@@ -43,6 +49,7 @@ void MainWindow::openPreferences()
     {
         this->priorities = dialog.getPriorities();
         this->status = dialog.getStatus();
+        save();
     }
 }
 
@@ -62,6 +69,7 @@ void MainWindow::onNewBoardClick()
         boards.append(b);
         QListWidgetItem *item = new QListWidgetItem(name);
         ui->listWidget->addItem(item);
+        save();
     }
 }
 
@@ -98,6 +106,7 @@ void MainWindow::onNewTaskClick()
             item->setForeground(2, fgColor);
 
             ui->treeWidget->addTopLevelItem(item);
+            save();
         }
     }
 }
@@ -153,11 +162,38 @@ void MainWindow::onEditTask(QTreeWidgetItem *item)
                 fgColor.setColor(Tools::getForegroundColor(bgColor.color()));
                 item->setBackground(2, bgColor);
                 item->setForeground(2, fgColor);
+                save();
             }
         }
     }
 }
 
+void MainWindow::init()
+{
+    if (Tools::isSaveFileExist())
+    {
+        QJsonDocument doc;
+        if (Tools::readSaveFile(doc))
+        {
+            QJsonObject save = doc.object();
+            for (QJsonValue value : save[PRIORITIES_KEY].toArray()) {
+                priorities.append(Priority(value.toObject()));
+            }
+            for (QJsonValue value : save[STATUS_KEY].toArray()) {
+                status.append(Status(value.toObject()));
+            }
+            for (QJsonValue value : save[BOARDS_KEY].toArray()) {
+                boards.append(new Board(value.toObject()));
+            }
+            redrawBoardList();
+            return;
+        }
+    }
+    this->priorities = defaultPriorities();
+    this->status = defaultStatus();
+    save();
+}
+
 QVector<Priority> MainWindow::defaultPriorities()
 {
     QVector<Priority> res;
@@ -228,10 +264,34 @@ const QColor MainWindow::getStatusColor(QString uuid, QColor defaultColor)
     return color;
 }
 
+const QJsonDocument MainWindow::getJsonSave()
+{
+    QJsonDocument doc;
+    QJsonObject obj;
+    QJsonArray jsonPriorities;
+    foreach (Priority p, this->priorities) {
+        jsonPriorities.append(p.toJson());
+    }
+    QJsonArray jsonStatus;
+    foreach (Status s, this->status) {
+        jsonStatus.append(s.toJson());
+    }
+    QJsonArray jsonBoards;
+    foreach (Board *b, this->boards) {
+        jsonBoards.append(b->toJson());
+    }
+    obj[PRIORITIES_KEY] = jsonPriorities;
+    obj[STATUS_KEY] = jsonStatus;
+    obj[BOARDS_KEY] = jsonBoards;
+    doc.setObject(obj);
+    return doc;
+}
+
 void MainWindow::redrawBoardList()
 {
     QListWidget *l = ui->listWidget;
-    for (uint16_t i = 0; i < l->count(); i++)
+    uint16_t itemCount = l->count();
+    for (int16_t i = itemCount; i >= 0; i--)
     {
         delete l->takeItem(i);
     }
@@ -245,7 +305,8 @@ void MainWindow::redrawBoardList()
 void MainWindow::redrawTaskTree()
 {
     QTreeWidget *l = ui->treeWidget;
-    for (uint16_t i = 0; i < l->topLevelItemCount(); i++)
+    uint16_t itemCount = l->topLevelItemCount();
+    for (int16_t i = itemCount; i >= 0; i--)
     {
         delete l->takeTopLevelItem(i);
     }
@@ -282,3 +343,12 @@ void MainWindow::redrawTaskTree()
 
 }
 
+void MainWindow::save()
+{
+    QJsonDocument doc = getJsonSave();
+    if (!Tools::writeSaveToFile(doc))
+    {
+        QMessageBox::critical(this, "Failed to save", "Failed to write the save to the file", QMessageBox::StandardButton::Ok);
+    }
+}
+
diff --git a/src/frames/mainwindow.h b/src/frames/mainwindow.h
index e19c33e..a24726b 100644
--- a/src/frames/mainwindow.h
+++ b/src/frames/mainwindow.h
@@ -4,6 +4,7 @@
 #include <QMainWindow>
 #include <QTreeWidgetItem>
 #include <QBrush>
+#include <QJsonDocument>
 
 #include "../models/priority.h"
 #include "../models/status.h"
@@ -32,6 +33,8 @@ private slots:
 private:
     Ui::MainWindow *ui;
 
+    void init();
+
     int16_t selectedBoardIndex;
     QVector<Priority> priorities;
     QVector<Status> status;
@@ -46,7 +49,10 @@ private:
     const QColor getPriorityColor(QString uuid, QColor defaultColor);
     const QColor getStatusColor(QString uuid, QColor defaultColor);
 
+    const QJsonDocument getJsonSave();
+
     void redrawBoardList();
     void redrawTaskTree();
+    void save();
 };
 #endif // MAINWINDOW_H
diff --git a/src/frames/prefdialog.cpp b/src/frames/prefdialog.cpp
index 6daac64..1935909 100644
--- a/src/frames/prefdialog.cpp
+++ b/src/frames/prefdialog.cpp
@@ -47,10 +47,10 @@ PrefDialog::~PrefDialog()
 
 QVector<Priority> PrefDialog::getPriorities()
 {
-    int count = ui->priorityListWidget->count();
+    uint16_t count = ui->priorityListWidget->count();
     QVector<Priority> res;
 
-    for (int i = 0; i < count; i++)
+    for (uint16_t i = 0; i < count; i++)
     {
         QListWidgetItem *item = ui->priorityListWidget->item(i);
         Priority p(priorityUUIDRef[i], item->text(), item->background().color());
@@ -62,10 +62,10 @@ QVector<Priority> PrefDialog::getPriorities()
 
 QVector<Status> PrefDialog::getStatus()
 {
-    int count = ui->statusListWidget->count();
+    uint16_t count = ui->statusListWidget->count();
     QVector<Status> res;
 
-    for (int i = 0; i < count; i++)
+    for (uint16_t i = 0; i < count; i++)
     {
         QListWidgetItem *item = ui->statusListWidget->item(i);
         Status s(statusUUIDRef[i], item->text(), item->background().color());
diff --git a/src/models/board.cpp b/src/models/board.cpp
index 3e2f9d9..62d37aa 100644
--- a/src/models/board.cpp
+++ b/src/models/board.cpp
@@ -1,10 +1,25 @@
 #include "board.h"
 
+#define NAME_KEY "name"
+#define TASKS_KEY "tasks"
+
+#include <QJsonArray>
+#include <QJsonValue>
+
 Board::Board(QString name)
 {
     this->name = name;
 }
 
+Board::Board(QJsonObject obj)
+{
+    this->name = obj[NAME_KEY].toString();
+    foreach (QJsonValue value, obj[TASKS_KEY].toArray()) {
+        Task *t = new Task(value.toObject());
+        this->tasks.append(t);
+    }
+}
+
 Board::~Board()
 {
     for (uint16_t i = 0; i < tasks.count(); i++)
@@ -38,3 +53,15 @@ const QVector<Task *> Board::getTasks()
     return tasks;
 }
 
+const QJsonObject Board::toJson()
+{
+    QJsonArray array;
+    foreach (Task *t, this->tasks) {
+        array.append(t->toJson());
+    }
+    QJsonObject obj;
+    obj[NAME_KEY] = this->name;
+    obj[TASKS_KEY] = array;
+    return obj;
+}
+
diff --git a/src/models/board.h b/src/models/board.h
index e40bbad..3979dfd 100644
--- a/src/models/board.h
+++ b/src/models/board.h
@@ -3,6 +3,7 @@
 
 #include <QVector>
 #include <QString>
+#include <QJsonObject>
 
 #include "task.h"
 
@@ -10,6 +11,7 @@ class Board
 {
 public:
     Board(QString name);
+    Board(QJsonObject);
     ~Board();
 
     const QString getName();
@@ -17,6 +19,8 @@ public:
     Task *taskAt(uint16_t);
     const QVector<Task*> getTasks();
 
+    const QJsonObject toJson();
+
 private:
     QVector<Task*> tasks;
     QString name;
diff --git a/src/models/priority.cpp b/src/models/priority.cpp
index 2507636..59460f7 100644
--- a/src/models/priority.cpp
+++ b/src/models/priority.cpp
@@ -1,5 +1,9 @@
 #include "priority.h"
 
+#define UUID_KEY "uuid"
+#define NAME_KEY "name"
+#define COLOR_KEY "color"
+
 Priority::Priority(QString uuid, QString name, QColor color)
 {
     this->uuid = uuid;
@@ -7,6 +11,13 @@ Priority::Priority(QString uuid, QString name, QColor color)
     this->color = color;
 }
 
+Priority::Priority(QJsonObject obj)
+{
+    this->uuid = obj[UUID_KEY].toString();
+    this->name = obj[NAME_KEY].toString();
+    this->color = QColor::fromString(obj[COLOR_KEY].toString());
+}
+
 const QString Priority::getName()
 {
     return this->name;
@@ -21,3 +32,12 @@ const QColor Priority::getColor()
 {
     return this->color;
 }
+
+const QJsonObject Priority::toJson()
+{
+    QJsonObject obj;
+    obj[UUID_KEY] = this->uuid;
+    obj[NAME_KEY] = this->name;
+    obj[COLOR_KEY] = this->color.name(QColor::HexRgb);
+    return obj;
+}
diff --git a/src/models/priority.h b/src/models/priority.h
index 63a1e5b..7b4e508 100644
--- a/src/models/priority.h
+++ b/src/models/priority.h
@@ -3,15 +3,18 @@
 
 #include <QString>
 #include <QColor>
+#include <QJsonObject>
 
 class Priority
 {
 public:
     Priority(QString uuid, QString name, QColor color);
+    Priority(QJsonObject);
 
     const QString getName();
     const QString getUUID();
     const QColor getColor();
+    const QJsonObject toJson();
 
 private:
     QString uuid;
diff --git a/src/models/status.cpp b/src/models/status.cpp
index 0bce06b..f78b6f3 100644
--- a/src/models/status.cpp
+++ b/src/models/status.cpp
@@ -1,5 +1,9 @@
 #include "status.h"
 
+#define UUID_KEY "uuid"
+#define NAME_KEY "name"
+#define COLOR_KEY "color"
+
 Status::Status(QString uuid, QString name, QColor color)
 {
     this->uuid = uuid;
@@ -7,6 +11,13 @@ Status::Status(QString uuid, QString name, QColor color)
     this->color = color;
 }
 
+Status::Status(QJsonObject obj)
+{
+    this->uuid = obj[UUID_KEY].toString();
+    this->name = obj[NAME_KEY].toString();
+    this->color = QColor::fromString(obj[COLOR_KEY].toString());
+}
+
 const QString Status::getName()
 {
     return this->name;
@@ -21,3 +32,12 @@ const QColor Status::getColor()
 {
     return this->color;
 }
+
+const QJsonObject Status::toJson()
+{
+    QJsonObject obj;
+    obj[UUID_KEY] = this->uuid;
+    obj[NAME_KEY] = this->name;
+    obj[COLOR_KEY] = this->color.name(QColor::HexRgb);
+    return obj;
+}
diff --git a/src/models/status.h b/src/models/status.h
index e4d7fc1..16bec9c 100644
--- a/src/models/status.h
+++ b/src/models/status.h
@@ -3,15 +3,18 @@
 
 #include <QString>
 #include <QColor>
+#include <QJsonObject>
 
 class Status
 {
 public:
     Status(QString uuid, QString name, QColor color);
+    Status(QJsonObject);
 
     const QString getName();
     const QString getUUID();
     const QColor getColor();
+    const QJsonObject toJson();
 
 private:
     QString uuid;
diff --git a/src/models/task.cpp b/src/models/task.cpp
index 7d56906..eb36cae 100644
--- a/src/models/task.cpp
+++ b/src/models/task.cpp
@@ -1,5 +1,11 @@
 #include "task.h"
 
+#define TITLE_KEY "title"
+#define DESCRIPTION_KEY "description"
+#define EXPECTEDFOR_KEY "expected_for"
+#define PRIORITY_KEY "priority"
+#define STATUS_KEY "status"
+
 Task::Task(QString title, QString description, QDate expectedFor, QString priorityUUID, QString statusUUID)
 {
     this->title = title;
@@ -9,6 +15,15 @@ Task::Task(QString title, QString description, QDate expectedFor, QString priori
     this->statusUUID = statusUUID;
 }
 
+Task::Task(QJsonObject obj)
+{
+    this->title = obj[TITLE_KEY].toString();
+    this->description = obj[DESCRIPTION_KEY].toString();
+    this->expectedFor = QDate::fromString(obj[EXPECTEDFOR_KEY].toString(), Qt::DateFormat::ISODate);
+    this->priorityUUID = obj[PRIORITY_KEY].toString();
+    this->statusUUID = obj[STATUS_KEY].toString();
+}
+
 const QString Task::getTitle()
 {
     return this->title;
@@ -34,6 +49,17 @@ const QString Task::getStatusUUID()
     return this->statusUUID;
 }
 
+const QJsonObject Task::toJson()
+{
+    QJsonObject obj;
+    obj[TITLE_KEY] = this->title;
+    obj[DESCRIPTION_KEY] = this->description;
+    obj[EXPECTEDFOR_KEY] = this->expectedFor.toString(Qt::DateFormat::ISODate);
+    obj[PRIORITY_KEY] = this->priorityUUID;
+    obj[STATUS_KEY] = this->statusUUID;
+    return obj;
+}
+
 void Task::update(Task t)
 {
     this->title = t.title;
diff --git a/src/models/task.h b/src/models/task.h
index 75606e3..c07cc84 100644
--- a/src/models/task.h
+++ b/src/models/task.h
@@ -3,17 +3,20 @@
 
 #include <QString>
 #include <QDate>
+#include <QJsonObject>
 
 class Task
 {
 public:
     Task(QString title, QString description, QDate expectedFor, QString priorityUUID, QString statusUUID);
+    Task(QJsonObject);
 
     const QString getTitle();
     const QString getDescription();
     const QDate getExpectedFor();
     const QString getPriorityUUID();
     const QString getStatusUUID();
+    const QJsonObject toJson();
 
     void update(Task);
 
diff --git a/src/tools.cpp b/src/tools.cpp
index 99a7284..8b9f174 100644
--- a/src/tools.cpp
+++ b/src/tools.cpp
@@ -3,13 +3,17 @@
 #define BRIGHTNESS_THRESHOLD 170
 #define WHITECOLOR 240
 #define BLACKCOLOR 15
+#define FILENAME "data.json"
+
+#include <QStandardPaths>
+#include <QDir>
 
 Tools::Tools()
 {
 
 }
 
-QColor Tools::getRandomColor()
+const QColor Tools::getRandomColor()
 {
     srand(time(0));
 #ifdef __linux__
@@ -24,24 +28,12 @@ QColor Tools::getRandomColor()
     return QColor(r, g, b);
 }
 
-QColor Tools::getForegroundColor(QColor background)
+const QColor Tools::getForegroundColor(QColor background)
 {
-    uint8_t avg = background.red();
-    avg += background.green();
-    avg += background.blue();
-    avg = avg / 3;
-
-    uint8_t avg2 = background.red();
-    avg2 += background.green();
-    avg2 = avg2 / 2;
-
-    uint8_t avg3 = background.red();
-    avg3 += background.blue();
-    avg3 = avg3 / 2;
-
-    uint8_t avg4 = background.green();
-    avg4 += background.blue();
-    avg4 = avg4 / 2;
+    uint8_t avg = (background.red() + background.green() + background.blue()) / 3;
+    uint8_t avg2 = (background.red() + background.green()) / 2;
+    uint8_t avg3 = (background.red() + background.blue()) / 2;
+    uint8_t avg4 = (background.green() + background.blue()) / 2;
 
     if (avg < BRIGHTNESS_THRESHOLD && avg2 < BRIGHTNESS_THRESHOLD && avg3 < BRIGHTNESS_THRESHOLD && avg4 < BRIGHTNESS_THRESHOLD)
     {
@@ -52,3 +44,54 @@ QColor Tools::getForegroundColor(QColor background)
         return QColor(BLACKCOLOR, BLACKCOLOR, BLACKCOLOR);
     }
 }
+
+const QString Tools::getSaveFilePath() {
+    QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
+    if (!QDir(path).exists())
+    {
+        QDir().mkpath(path);
+    }
+
+    path += "/data/";
+    if (!QDir(path).exists())
+    {
+        QDir().mkpath(path);
+    }
+    path += FILENAME;
+    return QDir::cleanPath(path);
+}
+
+bool Tools::isSaveFileExist()
+{
+    return QFile::exists(Tools::getSaveFilePath());
+}
+
+bool Tools::writeSaveToFile(QJsonDocument doc)
+{
+    bool success = false;
+    QFile *f = new QFile(getSaveFilePath());
+    if (f->open(QIODevice::WriteOnly))
+    {
+        f->write(doc.toJson());
+        f->close();
+        success = true;
+    }
+    delete f;
+    return success;
+}
+
+bool Tools::readSaveFile(QJsonDocument &doc) {
+    QFile* file = new QFile(getSaveFilePath());
+    if (!file->open(QIODevice::ReadOnly))
+    {
+        file->close();
+        delete file;
+        return false;
+    }
+    QString json = QString(file->readAll());
+    file->close();
+    delete file;
+
+    doc = QJsonDocument::fromJson(json.toUtf8());
+    return true;
+}
diff --git a/src/tools.h b/src/tools.h
index 97e0e22..86ca753 100644
--- a/src/tools.h
+++ b/src/tools.h
@@ -2,14 +2,21 @@
 #define TOOLS_H
 
 #include <QColor>
+#include <QJsonDocument>
 
 class Tools
 {
 public:
     Tools();
 
-    static QColor getRandomColor();
-    static QColor getForegroundColor(QColor background);
+    static const QColor getRandomColor();
+    static const QColor getForegroundColor(QColor background);
+    static bool isSaveFileExist();
+    static bool writeSaveToFile(QJsonDocument doc);
+    static bool readSaveFile(QJsonDocument &doc);
+
+private:
+    static const QString getSaveFilePath();
 
 };