HeatWave vs iBarometer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HeatWave
This app monitors outdoor and indoor temperatures to alert you when to open or close your windows for optimal home climate control. It uses your HomePod's sensor and local weather forecasts to provide timely notifications, helping you save energy and stay comfortable without an air conditioner.
- Real-time indoor/outdoor temperature display
- Forecast-based opening/closing alerts
- 30-minute advance notifications
- Home screen widgets
- Privacy-first, no servers or tracking
- Multi-language support
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A heat wave's worst trick is making you feel powerless. HeatWave is the simple, beautiful way to take back control of your home's temperature — without an air conditioner. Most of us already know the trick: open the windows when it's cooler outside, shut them when it gets hotter. The problem is knowing exactly when. HeatWave watches the weather forecast for your location and your indoor temperature, then quietly pings you 30 minutes before the air outside is about to cross the air inside. Open up just before it gets cool. Shut up just before it gets warm. That's it. HOW IT WORKS HeatWave uses Apple Weather to fetch a fresh, accurate forecast for your exact location. It uses your HomePod's built-in temperature sensor via Apple's Shortcuts app to know how warm it is inside. A guided setup wizard walks you through everything in under five minutes — tap the shortcut once, point it at your HomePod, then schedule when it runs. The more often the shortcut runs, the more precise your alerts become. HeatWave suggests a sensible minimum (hourly between 7–10am and 6–9pm) and tells you how to fine-tune it further. ON THE DASHBOARD A single screen tells you everything you need to know: • A bold status card that says "Open the windows" or "Shut the windows" right now. • Side-by-side cards showing your live indoor and outdoor temperatures, with timestamps so you always know how fresh the data is. • A countdown to the next change — "Open in 1h 24m" — with the forecast temperature at that moment. • A 12-hour bar chart of upcoming outdoor temperatures so you can plan your day at a glance. WIDGETS FOR YOUR HOME SCREEN Add HeatWave to your home or lock screen and you may never need to open the app. Small, medium, and large widgets show the current recommendation, your inside/outside temperatures, and a live countdown to the next window change. Lock-screen accessory widgets (circular, rectangular, inline) keep an eye on things at a glance. NOTIFICATIONS THAT FIRE 30 MINUTES AHEAD Get a gentle ping half an hour before each crossover, with the projected outdoor temperature so you can decide if it's worth getting up for. A built-in buffer prevents flip-flop alerts when temperatures wobble. WHY HEATWAVE • No air conditioner needed — works with the windows you already have. • Saves electricity and protects you from heat exhaustion in countries unprepared for high temperatures. • Beautiful, friendly UI with subtle haptics and warm gradients. • Privacy-first: everything lives on your device. No accounts, no servers, no tracking. • Fully localised in six languages. REQUIREMENTS • HomePod mini or HomePod 2nd generation (for indoor temperature) • iPhone running iOS 17 or later • Apple Weather (WeatherKit) for outdoor forecasts A heat wave doesn't have to leave you sweating. With HeatWave, your home gets a head start every time the air outside changes. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
iBarometer
This app transforms your iPhone into a professional barometer, providing real-time atmospheric pressure readings and trend analysis. It includes historical graphs, altitude display, and a fishing activity score. It functions offline and offers advanced fishing predictions with a Pro upgrade.
- Real-time atmospheric pressure
- Trend indicator and rate of change
- Altitude display
- Historical pressure graphs
- Fishing activity score
- Offline functionality
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iBarometer turns your iPhone into a professional-grade barometer. Powered by the built-in pressure sensor, it delivers real-time atmospheric pressure readings with beautiful precision gauges and trend charts. KEY FEATURES • Real-time Pressure — Live atmospheric pressure in hPa, inHg, or mmHg with a stunning gauge display • Trend Indicator — See at a glance whether pressure is rising, falling, or stable with change rate tracking • Altitude Display — Absolute elevation above sea level and relative height changes • History Charts — Visualize pressure trends over 1H, 3H, 6H, 12H, or 24H periods • Fishing Activity Score — Know the best times to fish based on pressure patterns • Offline Ready — All readings work without internet, perfect for remote locations FOR FISHING ENTHUSIASTS Barometric pressure directly affects fish behavior. When pressure drops rapidly, fish feed aggressively — that's your window. iBarometer helps you spot those moments with real-time trend tracking and a simple fishing activity score. FOR OUTDOOR ADVENTURES Whether hiking, climbing, or just curious about the weather, iBarometer gives you the atmospheric data you need. Track approaching storms before they arrive with falling pressure alerts. Upgrade to Pro to unlock: • Fishing Prediction — Detailed bite forecast with species-specific tips and best time suggestions Works with iPhone 6 or later. No internet required for core features. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: iBarometer at none against HeatWave's 3. HeatWave's advantage is ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. HeatWave sells 3 one-off in-app purchases. iBarometer asks for nothing beyond the download.
HeatWave ships an update every 11 days, iBarometer every 9 days. The most recent releases landed on August 14, 2026 and September 13, 2026 respectively.
| Parameter | HeatWave | iBarometer |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Update frequency | Every 11 days | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 29 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Christopher Hefferman | 景珂 陈 |
Customer experience
HeatWave
iBarometer
In-app purchases
HeatWave
- Coffee Money Tip$2.99
- Pint Money Tip$4.99
- Dinner Money Tip$14.99
iBarometer
No in-app purchases









