Gronu: OLED Stopwatch & Timer
In-app purchases
50+
Downloads
Everyone
info
About this app
Experience time with elegance.
Gronu is a minimalist stopwatch and countdown timer app built for people who value precision and clean aesthetics. Whether you're timing a workout, an interval training session, a cooking session, or a deep-work sprint, Gronu delivers a high-contrast, distraction-free timer experience that puts your time front and centre.
🌑 PURE BLACK OLED THEME
Gronu features a true Pure Black theme built specifically for OLED and AMOLED screens. Deep blacks, no wasted light, extended battery life — an OLED stopwatch that looks as good as it performs. Also available in Light mode.
⏱️ HIGH-PRECISION STOPWATCH
A full-featured lap timer with satisfying, responsive controls. Start, stop, and record laps with ease. Lap history lets you review every split at a glance — ideal for running, swimming, cycling, or any workout where splits matter.
⏲️ VERSATILE COUNTDOWN TIMER
Set custom countdown timer presets and choose your preferred alarm sound. A clear visual progress ring keeps you aware of remaining time without needing to glance at the numbers. Never miss the end of a session.
🛡️ ABSOLUTE PRIVACY
No tracking. No data collection. No internet connection required. Just a clean, fast timer app that does exactly what it says.
🛰️ LIGHTWEIGHT & SMOOTH
Gronu is lightweight on system resources with large, accessible buttons for easy one-handed control — in the gym, the kitchen, or anywhere else.
Who is Gronu for?
Anyone who wants a precise, distraction-free stopwatch and interval timer without the clutter of ads, accounts, or unnecessary features. If your phone's default clock feels clunky and every other timer app has too much going on, Gronu is the answer.
Control your time with Gronu. Clean. Simple.
———
時間を、エレガントに体験する。
Gronu（グロヌ）は、精度とミニマルな美しさを追求した、ストップウォッチ＆カウントダウンタイマーアプリです。トレーニング、インターバル走、料理、深い集中作業——あらゆる場面で、時間をシンプルかつ正確に計測します。
🌑 ピュアブラック OLEDテーマ
OLEDおよびAMOLED画面向けに設計された、真の純黒テーマ。余分な光を一切使わず、バッテリー消費を抑えながら、美しく高コントラストな表示を実現します。
⏱️ 高精度ストップウォッチ
ラップタイマー機能付き。スタート・ストップ・ラップ記録を快適な操作感で。ランニング・水泳・サイクリングなど、スプリットタイムが重要なあらゆるシーンに対応します。
⏲️ 多用途カウントダウンタイマー
カスタムプリセットとアラーム音を設定可能。ビジュアルプログレスリングで残り時間を直感的に把握できます。
🛡️ 完全プライベート
追跡なし。データ収集なし。インターネット接続不要。シンプルに、ただ時間を計るだけのアプリです。
Grontを使って、時間をコントロールしよう。クリーン。シンプル。
Gronu is a minimalist stopwatch and countdown timer app built for people who value precision and clean aesthetics. Whether you're timing a workout, an interval training session, a cooking session, or a deep-work sprint, Gronu delivers a high-contrast, distraction-free timer experience that puts your time front and centre.
🌑 PURE BLACK OLED THEME
Gronu features a true Pure Black theme built specifically for OLED and AMOLED screens. Deep blacks, no wasted light, extended battery life — an OLED stopwatch that looks as good as it performs. Also available in Light mode.
⏱️ HIGH-PRECISION STOPWATCH
A full-featured lap timer with satisfying, responsive controls. Start, stop, and record laps with ease. Lap history lets you review every split at a glance — ideal for running, swimming, cycling, or any workout where splits matter.
⏲️ VERSATILE COUNTDOWN TIMER
Set custom countdown timer presets and choose your preferred alarm sound. A clear visual progress ring keeps you aware of remaining time without needing to glance at the numbers. Never miss the end of a session.
🛡️ ABSOLUTE PRIVACY
No tracking. No data collection. No internet connection required. Just a clean, fast timer app that does exactly what it says.
🛰️ LIGHTWEIGHT & SMOOTH
Gronu is lightweight on system resources with large, accessible buttons for easy one-handed control — in the gym, the kitchen, or anywhere else.
Who is Gronu for?
Anyone who wants a precise, distraction-free stopwatch and interval timer without the clutter of ads, accounts, or unnecessary features. If your phone's default clock feels clunky and every other timer app has too much going on, Gronu is the answer.
Control your time with Gronu. Clean. Simple.
———
時間を、エレガントに体験する。
Gronu（グロヌ）は、精度とミニマルな美しさを追求した、ストップウォッチ＆カウントダウンタイマーアプリです。トレーニング、インターバル走、料理、深い集中作業——あらゆる場面で、時間をシンプルかつ正確に計測します。
🌑 ピュアブラック OLEDテーマ
OLEDおよびAMOLED画面向けに設計された、真の純黒テーマ。余分な光を一切使わず、バッテリー消費を抑えながら、美しく高コントラストな表示を実現します。
⏱️ 高精度ストップウォッチ
ラップタイマー機能付き。スタート・ストップ・ラップ記録を快適な操作感で。ランニング・水泳・サイクリングなど、スプリットタイムが重要なあらゆるシーンに対応します。
⏲️ 多用途カウントダウンタイマー
カスタムプリセットとアラーム音を設定可能。ビジュアルプログレスリングで残り時間を直感的に把握できます。
🛡️ 完全プライベート
追跡なし。データ収集なし。インターネット接続不要。シンプルに、ただ時間を計るだけのアプリです。
Grontを使って、時間をコントロールしよう。クリーン。シンプル。
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
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What’s new
⏱️All Gronu PRO features are now FREE for everyone.
⏱️Added Tip Jar. A small tip helps to support development and future updates.
⏱️Gronu PRO adds HIIT Timer, Focus Mode, Stopwatch+, and Multi-Timer.
⏱️It also unlocks templates, focus history, custom colors, and advanced sharing.
⏱️Added Tip Jar. A small tip helps to support development and future updates.
⏱️Gronu PRO adds HIIT Timer, Focus Mode, Stopwatch+, and Multi-Timer.
⏱️It also unlocks templates, focus history, custom colors, and advanced sharing.
App support
About the developer
UMEMURA WESLEY
gamublocks@gmail.com
1-2-2, UMEDA, KITA-KU
OSAKA EKIMAE NO.2 BLDG. 12-12
OSAKA, 大阪府 530-0001
Japan
+81 80-9487-0461
