
CoolGuard: Phone Temperature
Overheating & battery alerts
About
This app monitors your phone's temperature, providing alerts and tips to prevent overheating. It also functions as a nightstand clock with weather updates and battery health insights.
What's New in CoolGuard
1.4
November 11, 2026
What's new in 1.4: • Smart Wake: your alarm rings when you start to stir, within a window you choose before the set time (10–30 minutes) — using the microphone on iPhone, or your wrist movement on Apple Watch in the last half hour of the window. It always wakes you by the set time. Which mode is available varies by country, and in some countries neither is available yet • Alarms: choose the days and add a label; where the watch mode is available, you can also choose whether your watch, your phone or both wake you • Sleep Log: in Sleep Mode, your phone measures the sound of movement and — where available — snoring through the night; with Apple Watch, it also shows your sleep stages and heart rate. The sound is analyzed in real time on your phone; nothing is recorded • New Apple Watch app: vibrating alarms and Smart Wake — where the watch mode is available • Battery Care: an alert when your charge drops below the level you choose, plus the recommended charging range; your setting now also appears on the app's main screen. It alerts even with the app closed if you set up an automation for it in Shortcuts • 7-day weather forecast from the Outdoor Temperature tile, and an hourly UV band along the sun's path — with data from Apple Weather • Smarter widget: a 24-hour timeline with an hourly forecast, refreshed only when something changes • Tap the alarm on the clock tile to open your alarms, or tap the clock to show an analog clock in the large circle • Better VoiceOver support and proofread translations in all 50 languages Thanks for your feedback — it's shaping the app!
MoreSubscriptions & In-App Purchases
$0.99
Small tip
A coffee-sized tip to support development
Developer apps
FAQ
What is CoolGuard's primary function?
CoolGuard's main purpose is to monitor your iPhone's temperature, alerting you to overheating conditions and providing advice on how to cool it down. It also serves as a nightstand clock and displays weather information.
How does CoolGuard display the phone's heat level?
CoolGuard shows the live heat level on its main screen using a color-coded ring, indicating one of four official thermal levels: Normal, Slightly Warm, Hot, and Critical. It also offers quick tips based on the current level.
Can CoolGuard alert me if my phone gets too hot?
Yes, CoolGuard offers customizable alerts, including push notifications and sound alerts, based on the heat level you choose. It also supports background monitoring with Live Activities on the Lock Screen and in the Dynamic Island.
Does CoolGuard have a night mode?
Yes, CoolGuard features a Sleep Mode that displays a dark screen with just the clock and outdoor temperature in your chosen size and color. It includes burn-in protection features like slow pixel drift and dimming.
What kind of weather information does CoolGuard provide?
CoolGuard displays the outdoor temperature, including today's and tomorrow's highs and lows. It also features a 'weather face' on the ring that visually represents the sun and moon's travel from sunrise to sunset.
Does CoolGuard have ads?
No, CoolGuard is designed to be private and does not contain any ads. It also does not require accounts or analytics, ensuring your Heat Log data remains on your phone.
How can I support CoolGuard's development?
While CoolGuard is free to use, you can support its ongoing development by making a voluntary tip through one-time in-app purchases, with options for $0.99, $2.99, or $9.99.
What devices does CoolGuard support?
CoolGuard is available for Apple Watch, iPhone, and iPad, offering a range of features tailored to each device, including Lock Screen widgets for iPhones.








