Cumulo vs -40 Weather
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cumulo
This weather app helps you track forecasts for specific times and locations important to your daily routine. Set up custom "Spotlights" for events like your commute or morning jog and view hourly forecasts around those times. Widgets provide at-a-glance information directly on your home screen.
- Tag custom "Spotlights" for routine events
- Label specific locations
- View hourly forecasts around spotlighted times
- Home screen widgets for at-a-glance info
- Privacy-focused, no personal data retained
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Spotlight when and where you most consistently need to know the weather! Q: Will I need an umbrella for my commute home from work? A: Glance at Cumulo before you leave the house. Q: Will it be cool enough for a morning jog? A: Glance at Cumulo before bed. KEY FEATURES – Tag your Spotlights for clarity (i.e. Commute home) – Label locations for simplicity (I.e. Work) – See the hour before and after your spotlit time for a quick comparison – Add Widgets to your home screen for maximum at-a-glance usage PRIVACY Cumulo does not retain any of your personal information. It does not require your location or have access to any of your private information. SUPPORT Please reach out with any questions, concerns or feature requests. If you enjoy the app, please leave a review and let me know!
-40 Weather
This app displays temperatures in both Celsius and Fahrenheit simultaneously, eliminating the need for manual conversion. It features a professional-grade radar that draws weather maps directly on your device, offering smooth animations and detailed storm tracking for the US and Canada. You can also access forecasts, alerts, air quality, and marine conditions.
- Dual temperature scales (Celsius & Fahrenheit)
- On-device radar with animated maps
- Storm tracks and warning areas
- Swipeable city forecasts
- Hourly, daily, and extended forecasts
- Air quality and pollen forecasts
- Marine conditions and tides
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-40 is the one temperature where Celsius and Fahrenheit are exactly equal. It is also a weather app that shows you both scales at once, so you never have to convert, with radar built the way the professionals build it. BOTH SCALES, ALWAYS Every temperature appears in °C and °F side by side. Choose which one leads in Settings. RADAR THAT RUNS ON YOUR PHONE Most weather apps show you radar. -40 Weather runs it. Instead of downloading finished pictures of the weather, the app downloads compact radar data built from NOAA measurements and draws the map on your device. Pan and zoom instantly, watch a smooth animated loop, and see where storms are heading next. Storm tracks, warning areas and storm reports are layered on top, and you can zoom in for high-resolution detail. Covers the United States and Canada. YOUR CITIES, ONE SWIPE APART Save as many places as you like and swipe between them. Add your current location or search for any city in the world. FORECASTS AT A GLANCE Current conditions, feels-like, highs and lows, a 7-day forecast, hourly detail, wind, precipitation, and sun and moon times. First light and last light show the usable daylight before sunrise and after sunset. Morning, midday and evening cards suggest what the weather feels like, from sweater weather to beach weather. ONE TAP TO THE DETAILS Tiles on the home page show live values and open hourly, precipitation, wind, moon, air quality and pollen, and the Field Guide. WEATHER ALERTS See active alerts from the National Weather Service right on the main screen, with optional notifications. AIR QUALITY AND POLLEN Check air quality and a 5-day pollen forecast covering tree, grass and weed pollen. ON THE WATER Marine conditions, tides, and estimated fishing windows for coastal and inland waters near you. These are estimates and are not for navigation. BUILT TO SIP YOUR BATTERY Location uses a coarse fix instead of constant GPS tracking, and weather alerts arrive by push instead of the app checking in on a timer. DYNAMIC ISLAND AND LIVE ACTIVITIES Optionally keep the current temperature on your Lock Screen and in the Dynamic Island. MADE YOUR WAY Pick a color theme, including one that shifts with the temperature, and choose metric or imperial units. The bottom bar uses Liquid Glass on iOS 26. Works on iPhone and iPad. Weather data comes from OpenWeather, the National Weather Service and NOAA, Open-Meteo, Google and other sources listed in Settings. Forecasts and alerts are for general information and are not a substitute for official warnings.
Screenshots
Verdict
The clearest difference is in-app purchases: -40 Weather at none against Cumulo's 1. On price, rating, ratings volume and ads 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. Cumulo sells 1 one-off in-app purchase. -40 Weather asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Cumulo against 5.0 for -40 Weather. Both are backed by a comparable volume of ratings — 3 and 2 respectively.
| Parameter | Cumulo | -40 Weather |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | 2 |
| Update frequency | — | Every 5 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Jessica Linden | Jacob Egly |
In-app purchases
Cumulo
- Make It Rain$2.99
-40 Weather
No in-app purchases









