Cumulus vs Graf IoT
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Cumulus
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Mit der App werden die Messwerte von THIES Clima Wetterstationen angezeigt und verwaltet. Die App ermΓΆglicht den Zugriff auf aktuelle und gespeicherte Messwerte. Γber die Gruppenverwaltung ist es mΓΆglich eigene, private Netzwerke zu erstellen und zu verwalten.
Graf IoT
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GRAF IoT shows you how much water is in your system at any time and alerts you before it gets critical. The app connects to your GRAF BlueLevel and GRAF ARCOS devices and brings level, volume and system status together on one dashboard. You get a notification when the level runs too low or too high. The built-in weather forecast shows you the rainfall heading for your site. FEATURES β’ Fill level and remaining volume in litres and percent β’ Alerts for critical fill levels β’ Weather forecast for the location of your system β’ Level height and device status for every system β’ All devices on one central dashboard β’ Device data, assignment and location at a glance β’ Light and dark mode For cisterns and rainwater systems with GRAF BlueLevel and for retention and infiltration systems with GRAF ARCOS. A connected GRAF device is required to use the app.
Screenshots
Verdict
The clearest difference is in-app purchases: Graf IoT at none against Cumulus's 6. Graf IoT also leads on update cadence (monthly vs every 2 months). Cumulus's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Cumulus sells 6 one-off in-app purchases. Graf IoT asks for nothing beyond the download.
Cumulus ships an update every 2 months, Graf IoT monthly. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.
| Parameter | Cumulus | Graf IoT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Monthly β better |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad, iPod β better | iPhone |
| Requires iOS | 15.0 β better | 16.0 |
| Further details β not scored | ||
| Size | 180 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Adolf Thies GMBH & CO. KG | Otto Graf GmbH Kunststofferzeugnisse |
In-app purchases
Cumulus
- 12 months archiving period$8.99
- 24 months archiving period$15.99
- 1 year event handling$84.99
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- Buy 10 users$139.99
- Buy 20 users$179.99
- Buy 50 users$299.99
Graf IoT
No in-app purchases









