diff --git a/src/components/toolbox/pomodoro/button/button.module.css b/src/components/toolbox/pomodoro/button/button.module.css
new file mode 100644
index 0000000..6b7c628
--- /dev/null
+++ b/src/components/toolbox/pomodoro/button/button.module.css
@@ -0,0 +1,19 @@
+.button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 30px;
+  height: 30px;
+  font-size: var(--font-xsm);
+  color: var(--color-foreground);
+  cursor: pointer;
+  background-color: var(--color-neutral-100);
+  border: 1px solid var(--color-neutral-200);
+  border-radius: 4px;
+  outline: none;
+  transition: 0.2s;
+
+  &:hover {
+    background-color: var(--color-neutral-200);
+  }
+}
diff --git a/src/components/toolbox/pomodoro/button/button.tsx b/src/components/toolbox/pomodoro/button/button.tsx
new file mode 100644
index 0000000..5ecef5d
--- /dev/null
+++ b/src/components/toolbox/pomodoro/button/button.tsx
@@ -0,0 +1,19 @@
+import { Tooltip } from '@/components/tooltip';
+
+import styles from './button.module.css';
+
+interface ButtonProps {
+  icon: React.ReactElement;
+  onClick: () => void;
+  tooltip: string;
+}
+
+export function Button({ icon, onClick, tooltip }: ButtonProps) {
+  return (
+    <Tooltip content={tooltip} hideDelay={0} placement="bottom" showDelay={0}>
+      <button className={styles.button} onClick={onClick}>
+        {icon}
+      </button>
+    </Tooltip>
+  );
+}
diff --git a/src/components/toolbox/pomodoro/button/index.ts b/src/components/toolbox/pomodoro/button/index.ts
new file mode 100644
index 0000000..a039b75
--- /dev/null
+++ b/src/components/toolbox/pomodoro/button/index.ts
@@ -0,0 +1 @@
+export { Button } from './button';
diff --git a/src/components/toolbox/pomodoro/pomodoro.module.css b/src/components/toolbox/pomodoro/pomodoro.module.css
index 8f414f5..54351e5 100644
--- a/src/components/toolbox/pomodoro/pomodoro.module.css
+++ b/src/components/toolbox/pomodoro/pomodoro.module.css
@@ -1 +1,17 @@
-/* TODO */
+.control {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-top: 8px;
+
+  & .completed {
+    font-size: var(--font-xsm);
+    color: var(--color-foreground-subtle);
+  }
+
+  & .buttons {
+    display: flex;
+    column-gap: 4px;
+    align-items: center;
+  }
+}
diff --git a/src/components/toolbox/pomodoro/pomodoro.tsx b/src/components/toolbox/pomodoro/pomodoro.tsx
index 22c88c9..a61314c 100644
--- a/src/components/toolbox/pomodoro/pomodoro.tsx
+++ b/src/components/toolbox/pomodoro/pomodoro.tsx
@@ -1,10 +1,12 @@
-import { useState } from 'react';
+import { useState, useEffect, useRef, useMemo } from 'react';
+import { FaUndo, FaPlay, FaPause } from 'react-icons/fa/index';
 
 import { Modal } from '@/components/modal';
 import { Tabs } from './tabs';
 import { Timer } from './timer';
+import { Button } from './button';
 
-// import styles from './pomodoro.module.css';
+import styles from './pomodoro.module.css';
 
 interface PomodoroProps {
   onClose: () => void;
@@ -13,18 +15,84 @@ interface PomodoroProps {
 
 export function Pomodoro({ onClose, show }: PomodoroProps) {
   const [selectedTab, setSelectedTab] = useState('pomodoro');
+  const [running, setRunning] = useState(false);
+  const [timer, setTimer] = useState(10);
+  const interval = useRef<ReturnType<typeof setInterval> | null>(null);
 
-  const tabs = [
-    { id: 'pomodoro', label: 'Pomodoro' },
-    { id: 'short', label: 'Break' },
-    { id: 'long', label: 'Long Break' },
-  ];
+  const tabs = useMemo(
+    () => [
+      { id: 'pomodoro', label: 'Pomodoro', time: 60 },
+      { id: 'short', label: 'Break', time: 60 },
+      { id: 'long', label: 'Long Break', time: 60 },
+    ],
+    [],
+  );
+
+  useEffect(() => {
+    if (running) {
+      if (interval.current) clearInterval(interval.current);
+
+      interval.current = setInterval(() => {
+        setTimer(prev => prev - 1);
+      }, 1000);
+    } else {
+      if (interval.current) clearInterval(interval.current);
+    }
+  }, [running]);
+
+  useEffect(() => {
+    if (timer <= 0) {
+      if (interval.current) clearInterval(interval.current);
+
+      setRunning(false);
+    }
+  }, [timer]);
+
+  useEffect(() => {
+    const time = tabs.find(tab => tab.id === selectedTab)?.time || 10;
+
+    if (interval.current) clearInterval(interval.current);
+
+    setRunning(false);
+    setTimer(time);
+  }, [selectedTab, tabs]);
+
+  const toggleRunning = () => {
+    if (running) setRunning(false);
+    else if (timer <= 0) {
+      const time = tabs.find(tab => tab.id === selectedTab)?.time || 10;
+
+      setTimer(time);
+      setRunning(true);
+    } else setRunning(true);
+  };
+
+  const restart = () => {
+    if (interval.current) clearInterval(interval.current);
+
+    const time = tabs.find(tab => tab.id === selectedTab)?.time || 10;
+
+    setRunning(false);
+    setTimer(time);
+  };
 
   return (
     <Modal show={show} onClose={onClose}>
       <h1>Pomodoro Timer</h1>
       <Tabs selectedTab={selectedTab} tabs={tabs} onSelect={setSelectedTab} />
-      <Timer />
+      <Timer timer={timer} />
+
+      <div className={styles.control}>
+        <p className={styles.completed}>0 completed</p>
+        <div className={styles.buttons}>
+          <Button icon={<FaUndo />} tooltip="Restart" onClick={restart} />
+          <Button
+            icon={running ? <FaPause /> : <FaPlay />}
+            tooltip={running ? 'Pause' : 'Start'}
+            onClick={toggleRunning}
+          />
+        </div>
+      </div>
     </Modal>
   );
 }
diff --git a/src/components/toolbox/pomodoro/timer/timer.tsx b/src/components/toolbox/pomodoro/timer/timer.tsx
index 21aa1f5..81a25b2 100644
--- a/src/components/toolbox/pomodoro/timer/timer.tsx
+++ b/src/components/toolbox/pomodoro/timer/timer.tsx
@@ -1,5 +1,15 @@
+import { padNumber } from '@/helpers/number';
+
 import styles from './timer.module.css';
 
-export function Timer() {
-  return <div className={styles.timer}>25:00</div>;
+interface TimerProps {
+  timer: number;
+}
+
+export function Timer({ timer }: TimerProps) {
+  return (
+    <div className={styles.timer}>
+      {padNumber(Math.floor(timer / 60))}:{padNumber(timer % 60)}
+    </div>
+  );
 }
diff --git a/src/helpers/number.ts b/src/helpers/number.ts
new file mode 100644
index 0000000..e904111
--- /dev/null
+++ b/src/helpers/number.ts
@@ -0,0 +1,3 @@
+export function padNumber(number: number, maxLength: number = 2): string {
+  return number.toString().padStart(maxLength, '0');
+}