diff --git a/src/App.tsx b/src/App.tsx
index 81e011f432..04512b7508 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,26 +1,263 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
 /* eslint-disable max-len */
 /* eslint-disable jsx-a11y/control-has-associated-label */
-import React from 'react';
+
+import React, { useEffect, useMemo, useRef } from 'react';
+
 import { UserWarning } from './UserWarning';
+import { USER_ID } from './api/todos';
+import { Todo } from './types/Todo';
+import { getTodos, addTodo, deleteTodo, updateTodo } from './api/todos';
 
-const USER_ID = 0;
+import { Header } from './components/Header';
+import { TodoList } from './components/TodoList';
+import { Footer } from './components/Footer';
+import { ErrorNotification } from './components/ErrorNotification';
+import { Filter } from './types/Filter';
+import { ErrorMessage } from './types/ErrorMessage';
 
 export const App: React.FC = () => {
+  const [todos, setTodos] = React.useState<Todo[]>([]);
+  const [error, setError] = React.useState<string | null>(null);
+  const [newTitle, setNewTitle] = React.useState('');
+  const [tempTodo, setTempTodo] = React.useState<Todo | null>(null);
+  const [isAdding, setIsAdding] = React.useState(false);
+  const [deleteIds, setDeleteIds] = React.useState<number[]>([]);
+  const [filter, setFilter] = React.useState<Filter>(Filter.All);
+  const [loadingIds, setLoadingIds] = React.useState<number[]>([]);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  const loadTodos = async () => {
+    try {
+      const data = await getTodos();
+
+      setTodos(data);
+    } catch {
+      setTodos([]);
+      setError(ErrorMessage.Load);
+    }
+  };
+
+  useEffect(() => {
+    setTimeout(loadTodos, 0);
+  }, []);
+
+  useEffect(() => {
+    if (!error) {
+      return;
+    }
+
+    const timer = setTimeout(() => setError(null), 3000);
+
+    return () => clearTimeout(timer);
+  }, [error]);
+
+  useEffect(() => {
+    inputRef.current?.focus();
+  });
+
+  const activeCount = todos.filter(t => !t.completed).length;
+  const hasCompleted = todos.some(t => t.completed);
+  const allCompleted = todos.length > 0 && activeCount === 0;
+
+  const visibleTodos = useMemo(() => {
+    switch (filter) {
+      case Filter.Active:
+        return todos.filter(t => !t.completed);
+      case Filter.Completed:
+        return todos.filter(t => t.completed);
+      default:
+        return todos;
+    }
+  }, [todos, filter]);
+
+  const handleAddTodo = async (e: React.FormEvent) => {
+    e.preventDefault();
+
+    const trimmed = newTitle.trim();
+
+    if (!trimmed) {
+      setError(ErrorMessage.EmptyTitle);
+
+      return;
+    }
+
+    const temp: Todo = {
+      id: 0,
+      title: trimmed,
+      completed: false,
+      userId: USER_ID,
+    };
+
+    setTempTodo(temp);
+    setIsAdding(true);
+
+    try {
+      const created = await addTodo({
+        title: trimmed,
+        completed: false,
+        userId: USER_ID,
+      });
+
+      setTodos(prev => [...prev, created]);
+      setNewTitle('');
+    } catch {
+      setError(ErrorMessage.Add);
+    } finally {
+      setTempTodo(null);
+      setIsAdding(false);
+    }
+  };
+
+  const handleDeleteTodo = async (id: number) => {
+    setDeleteIds(prev => [...prev, id]);
+
+    try {
+      await deleteTodo(id);
+      setTodos(prev => prev.filter(t => t.id !== id));
+    } catch {
+      setError(ErrorMessage.Delete);
+    } finally {
+      setDeleteIds(prev => prev.filter(x => x !== id));
+    }
+  };
+
+  const handleClearCompleted = async () => {
+    const completed = todos.filter(t => t.completed);
+
+    const results = await Promise.allSettled(
+      completed.map(t => deleteTodo(t.id)),
+    );
+
+    const okIds: number[] = [];
+
+    results.forEach((r, i) => {
+      if (r.status === 'fulfilled') {
+        okIds.push(completed[i].id);
+      }
+    });
+
+    setTodos(prev => prev.filter(t => !okIds.includes(t.id)));
+
+    if (results.some(r => r.status === 'rejected')) {
+      setError(ErrorMessage.Delete);
+    }
+  };
+
+  const handleToggleTodo = async (todo: Todo) => {
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    try {
+      const updated = await updateTodo(todo.id, {
+        completed: !todo.completed,
+      });
+
+      setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+    } catch {
+      setError(ErrorMessage.Update);
+    } finally {
+      setLoadingIds(prev => prev.filter(id => id !== todo.id));
+    }
+  };
+
+  const handleToggleAll = async () => {
+    const newStatus = !allCompleted;
+
+    const toUpdate = todos.filter(t => t.completed !== newStatus);
+
+    await Promise.all(
+      toUpdate.map(async todo => {
+        setLoadingIds(prev => [...prev, todo.id]);
+
+        try {
+          const updated = await updateTodo(todo.id, {
+            completed: newStatus,
+          });
+
+          setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+        } catch {
+          setError(ErrorMessage.Update);
+        } finally {
+          setLoadingIds(prev => prev.filter(id => id !== todo.id));
+        }
+      }),
+    );
+  };
+
   if (!USER_ID) {
     return <UserWarning />;
   }
 
+  const handleRename = async (todo: Todo, update: string) => {
+    const trimmed = update.trim();
+
+    if (trimmed === todo.title) {
+      return;
+    }
+
+    if (!trimmed) {
+      await handleDeleteTodo(todo.id);
+
+      return;
+    }
+
+    setLoadingIds(prev => [...prev, todo.id]);
+
+    try {
+      const updated = await updateTodo(todo.id, {
+        title: trimmed,
+      });
+
+      setTodos(prev => prev.map(t => (t.id === todo.id ? updated : t)));
+    } catch {
+      setError(ErrorMessage.Update);
+
+      throw new Error('Unable to update');
+    } finally {
+      setLoadingIds(prev => prev.filter(id => id !== todo.id));
+    }
+  };
+
   return (
-    <section className="section container">
-      <p className="title is-4">
-        Copy all you need from the prev task:
-        <br />
-        <a href="https://github.com/mate-academy/react_todo-app-add-and-delete#react-todo-app-add-and-delete">
-          React Todo App - Add and Delete
-        </a>
-      </p>
-
-      <p className="subtitle">Styles are already copied</p>
-    </section>
+    <div className="todoapp">
+      <h1 className="todoapp__title">todos</h1>
+
+      <div className="todoapp__content">
+        <Header
+          newTitle={newTitle}
+          setNewTitle={setNewTitle}
+          onSubmit={handleAddTodo}
+          isAdding={isAdding}
+          inputRef={inputRef}
+          allCompleted={allCompleted}
+          hasTodos={todos.length > 0}
+          onToggleAll={handleToggleAll}
+        />
+
+        <TodoList
+          todos={visibleTodos}
+          deleteIds={deleteIds}
+          loadingIds={loadingIds}
+          onDelete={handleDeleteTodo}
+          onToggle={handleToggleTodo}
+          onRename={handleRename}
+          tempTodo={tempTodo}
+          isAdding={isAdding}
+        />
+
+        {todos.length > 0 && (
+          <Footer
+            activeCount={activeCount}
+            filter={filter}
+            setFilter={setFilter}
+            hasCompleted={hasCompleted}
+            onClearCompleted={handleClearCompleted}
+          />
+        )}
+      </div>
+
+      <ErrorNotification error={error} onClose={() => setError(null)} />
+    </div>
   );
 };
diff --git a/src/api/todos.ts b/src/api/todos.ts
new file mode 100644
index 0000000000..9da09a5d52
--- /dev/null
+++ b/src/api/todos.ts
@@ -0,0 +1,23 @@
+import { Todo } from '../types/Todo';
+import { client } from '../utils/fetchClient';
+
+export const USER_ID = 4139;
+
+export const getTodos = () => {
+  return client.get<Todo[]>(`/todos?userId=${USER_ID}`);
+};
+
+export const addTodo = (todo: Omit<Todo, 'id'>) => {
+  return client.post<Todo>('/todos', {
+    ...todo,
+    userId: USER_ID,
+  });
+};
+
+export const deleteTodo = (id: number) => {
+  return client.delete(`/todos/${id}`);
+};
+
+export const updateTodo = (id: number, updates: Partial<Omit<Todo, 'id'>>) => {
+  return client.patch<Todo>(`/todos/${id}`, updates);
+};
diff --git a/src/components/ErrorNotification.tsx b/src/components/ErrorNotification.tsx
new file mode 100644
index 0000000000..2b2520905e
--- /dev/null
+++ b/src/components/ErrorNotification.tsx
@@ -0,0 +1,26 @@
+import React from 'react';
+
+type Props = {
+  error: string | null;
+  onClose: () => void;
+};
+
+export const ErrorNotification: React.FC<Props> = ({ error, onClose }) => {
+  return (
+    <div
+      data-cy="ErrorNotification"
+      className={`notification is-danger is-light has-text-weight-normal ${
+        error ? '' : 'hidden'
+      }`}
+    >
+      <button
+        data-cy="HideErrorButton"
+        type="button"
+        className="delete"
+        onClick={onClose}
+      />
+
+      {error}
+    </div>
+  );
+};
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
new file mode 100644
index 0000000000..f3cccb54f3
--- /dev/null
+++ b/src/components/Footer.tsx
@@ -0,0 +1,59 @@
+import React from 'react';
+import { Filter } from '../types/Filter';
+
+type Props = {
+  activeCount: number;
+  filter: Filter;
+  setFilter: (value: Filter) => void;
+  hasCompleted: boolean;
+  onClearCompleted: () => void;
+};
+
+const filters = [
+  { label: 'All', value: Filter.All, href: '#/' },
+  { label: 'Active', value: Filter.Active, href: '#/active' },
+  { label: 'Completed', value: Filter.Completed, href: '#/completed' },
+];
+
+export const Footer: React.FC<Props> = ({
+  activeCount,
+  filter,
+  setFilter,
+  hasCompleted,
+  onClearCompleted,
+}) => {
+  return (
+    <footer className="todoapp__footer" data-cy="Footer">
+      <span className="todo-count" data-cy="TodosCounter">
+        {activeCount} items left
+      </span>
+
+      <nav className="filter" data-cy="Filter">
+        {filters.map(f => (
+          <a
+            key={f.value}
+            href={f.href}
+            className={`filter__link ${filter === f.value ? 'selected' : ''}`}
+            onClick={e => {
+              e.preventDefault();
+              setFilter(f.value);
+            }}
+            data-cy={`FilterLink${f.label}`}
+          >
+            {f.label}
+          </a>
+        ))}
+      </nav>
+
+      <button
+        type="button"
+        className="todoapp__clear-completed"
+        data-cy="ClearCompletedButton"
+        disabled={!hasCompleted}
+        onClick={onClearCompleted}
+      >
+        Clear completed
+      </button>
+    </footer>
+  );
+};
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
new file mode 100644
index 0000000000..deeb5e5354
--- /dev/null
+++ b/src/components/Header.tsx
@@ -0,0 +1,49 @@
+import React from 'react';
+
+type Props = {
+  newTitle: string;
+  setNewTitle: (value: string) => void;
+  onSubmit: (e: React.FormEvent<HTMLFormElement>) => void;
+  isAdding: boolean;
+  inputRef: React.RefObject<HTMLInputElement>;
+  allCompleted: boolean;
+  hasTodos: boolean;
+  onToggleAll?: () => void;
+};
+
+export const Header: React.FC<Props> = ({
+  newTitle,
+  setNewTitle,
+  onSubmit,
+  isAdding,
+  inputRef,
+  allCompleted,
+  hasTodos,
+  onToggleAll,
+}) => {
+  return (
+    <header className="todoapp__header">
+      {hasTodos && (
+        <button
+          type="button"
+          className={`todoapp__toggle-all ${allCompleted ? 'active' : ''}`}
+          data-cy="ToggleAllButton"
+          onClick={onToggleAll}
+        />
+      )}
+
+      <form onSubmit={onSubmit}>
+        <input
+          data-cy="NewTodoField"
+          type="text"
+          className="todoapp__new-todo"
+          placeholder="What needs to be done?"
+          value={newTitle}
+          onChange={e => setNewTitle(e.target.value)}
+          disabled={isAdding}
+          ref={inputRef}
+        />
+      </form>
+    </header>
+  );
+};
diff --git a/src/components/TodoList.tsx b/src/components/TodoList.tsx
new file mode 100644
index 0000000000..9ee58cf8fb
--- /dev/null
+++ b/src/components/TodoList.tsx
@@ -0,0 +1,180 @@
+/* eslint-disable jsx-a11y/label-has-associated-control */
+import React from 'react';
+import { Todo } from '../types/Todo';
+
+type Props = {
+  todos: Todo[];
+  deleteIds: number[];
+  onDelete: (id: number) => Promise<void>;
+  tempTodo: Todo | null;
+  isAdding: boolean;
+  loadingIds: number[];
+  onToggle: (todo: Todo) => void;
+  onRename: (todo: Todo, newTitle: string) => Promise<void>;
+};
+
+export const TodoList: React.FC<Props> = ({
+  todos,
+  deleteIds,
+  onDelete,
+  tempTodo,
+  isAdding,
+  loadingIds,
+  onToggle,
+  onRename,
+}) => {
+  const [editingId, setEditingId] = React.useState<number | null>(null);
+  const [editedTitle, setEditedTitle] = React.useState('');
+
+  const handleEditStart = (todo: Todo) => {
+    setEditingId(todo.id);
+    setEditedTitle(todo.title);
+  };
+
+  const handleEditCancel = (todo: Todo) => {
+    setEditedTitle(todo.title);
+    setEditingId(null);
+  };
+
+  const handleEditSubmit = async (todo: Todo) => {
+    const trimmed = editedTitle.trim();
+
+    if (trimmed === todo.title) {
+      setEditingId(null);
+
+      return;
+    }
+
+    if (!trimmed) {
+      try {
+        await onDelete(todo.id);
+      } catch {
+        //
+      }
+
+      return;
+    }
+
+    try {
+      await onRename(todo, trimmed);
+
+      setEditingId(null);
+    } catch {
+      // keep opened
+    }
+  };
+
+  const handleEditKeyUp = (
+    e: React.KeyboardEvent<HTMLInputElement>,
+    todo: Todo,
+  ) => {
+    if (e.key === 'Escape') {
+      handleEditCancel(todo);
+    }
+
+    if (e.key === 'Enter') {
+      (e.target as HTMLInputElement).blur();
+    }
+  };
+
+  return (
+    <section className="todoapp__main" data-cy="TodoList">
+      {todos.map(todo => (
+        <div
+          key={todo.id}
+          data-cy="Todo"
+          className={`todo ${todo.completed ? 'completed' : ''}`}
+        >
+          <label className="todo__status-label">
+            <input
+              data-cy="TodoStatus"
+              type="checkbox"
+              className="todo__status"
+              checked={todo.completed}
+              onChange={() => onToggle(todo)}
+            />
+          </label>
+
+          {editingId === todo.id ? (
+            <input
+              data-cy="TodoTitleField"
+              type="text"
+              className="todo__title-field"
+              placeholder="Empty todo will be deleted"
+              value={editedTitle}
+              onChange={e => setEditedTitle(e.target.value)}
+              onBlur={() => handleEditSubmit(todo)}
+              onKeyUp={e => handleEditKeyUp(e, todo)}
+              autoFocus
+            />
+          ) : (
+            <span
+              data-cy="TodoTitle"
+              className="todo__title"
+              onDoubleClick={() => handleEditStart(todo)}
+            >
+              {todo.title}
+            </span>
+          )}
+
+          {editingId !== todo.id && (
+            <button
+              type="button"
+              className="todo__remove"
+              data-cy="TodoDelete"
+              onClick={() => onDelete(todo.id)}
+            >
+              ×
+            </button>
+          )}
+
+          <div
+            data-cy="TodoLoader"
+            className={`modal overlay ${
+              deleteIds.includes(todo.id) || loadingIds.includes(todo.id)
+                ? 'is-active'
+                : 'is-hidden'
+            }`}
+          >
+            <div className="modal-background has-background-white-ter" />
+            <div className="loader" />
+          </div>
+        </div>
+      ))}
+
+      {tempTodo && (
+        <div data-cy="Todo" className="todo">
+          <label className="todo__status-label">
+            <input
+              data-cy="TodoStatus"
+              type="checkbox"
+              className="todo__status"
+              disabled
+            />
+          </label>
+
+          <span data-cy="TodoTitle" className="todo__title">
+            {tempTodo.title}
+          </span>
+
+          <button
+            type="button"
+            className="todo__remove"
+            data-cy="TodoDelete"
+            onClick={() => onDelete(tempTodo.id)}
+          >
+            ×
+          </button>
+
+          <div
+            data-cy="TodoLoader"
+            className={`modal overlay ${isAdding ? 'is-active' : ''}`}
+          >
+            <div className="modal-background has-background-white-ter" />
+            <div className="loader" />
+          </div>
+        </div>
+      )}
+    </section>
+  );
+};
diff --git a/src/types/ErrorMessage.ts b/src/types/ErrorMessage.ts
new file mode 100644
index 0000000000..ec07b7f3d3
--- /dev/null
+++ b/src/types/ErrorMessage.ts
@@ -0,0 +1,7 @@
+export enum ErrorMessage {
+  Load = 'Unable to load todos',
+  Add = 'Unable to add a todo',
+  Delete = 'Unable to delete a todo',
+  EmptyTitle = 'Title should not be empty',
+  Update = 'Unable to update a todo',
+}
diff --git a/src/types/Filter.ts b/src/types/Filter.ts
new file mode 100644
index 0000000000..174408fd69
--- /dev/null
+++ b/src/types/Filter.ts
@@ -0,0 +1,5 @@
+export enum Filter {
+  All = 'all',
+  Active = 'active',
+  Completed = 'completed',
+}
diff --git a/src/types/Todo.ts b/src/types/Todo.ts
new file mode 100644
index 0000000000..3f52a5fdde
--- /dev/null
+++ b/src/types/Todo.ts
@@ -0,0 +1,6 @@
+export interface Todo {
+  id: number;
+  userId: number;
+  title: string;
+  completed: boolean;
+}
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
new file mode 100644
index 0000000000..708ac4c17b
--- /dev/null
+++ b/src/utils/fetchClient.ts
@@ -0,0 +1,46 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const BASE_URL = 'https://mate.academy/students-api';
+
+// returns a promise resolved after a given delay
+function wait(delay: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, delay);
+  });
+}
+
+// To have autocompletion and avoid mistypes
+type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
+
+function request<T>(
+  url: string,
+  method: RequestMethod = 'GET',
+  data: any = null, // we can send any data to the server
+): Promise<T> {
+  const options: RequestInit = { method };
+
+  if (data) {
+    // We add body and Content-Type only for the requests with data
+    options.body = JSON.stringify(data);
+    options.headers = {
+      'Content-Type': 'application/json; charset=UTF-8',
+    };
+  }
+
+  // DON'T change the delay it is required for tests
+  return wait(100)
+    .then(() => fetch(BASE_URL + url, options))
+    .then(response => {
+      if (!response.ok) {
+        throw new Error();
+      }
+
+      return response.json();
+    });
+}
+
+export const client = {
+  get: <T>(url: string) => request<T>(url),
+  post: <T>(url: string, data: any) => request<T>(url, 'POST', data),
+  patch: <T>(url: string, data: any) => request<T>(url, 'PATCH', data),
+  delete: (url: string) => request(url, 'DELETE'),
+};