Roll Alarm vs WATTSTUNDE NOVA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Roll Alarm
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This roll alarm allows you to mount your device on a ride-on lawnmower, boat, excavator, caravan or any other type of machine, and set the limit for how much tilt is allowed before it becomes unsafe. As the machine tilts and gets closer to the limit you set, you will get a visual and audio alarm to warn you.
WATTSTUNDE NOVA
Monitor your WATTSTUNDE Smart Lithium Battery via Bluetooth 5.0 BLE. View real-time voltage, current, temperature, and cycle life data for your LiFePO4 battery within a 5-meter range. Connect to a single battery at a time for detailed performance insights.
- Bluetooth 5.0 BLE connectivity
- Monitor voltage, current, temperature
- Track cycle life
- Real-time data display
- Connect to one battery at a time
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This APP is only for WATTSTUNDE Smart Lithium Batttery which based on bluetooth 5.0 BLE technology 1.WATTSTUNDE NOVA is used for monitoring Lithium battery. 2. Measuring distance no more than 5m. 3. The APP only can connect one LiFePO4 battery every time. 4. This APP can monitoring voltage, current, temperature and cycle life, etc
Screenshots
Verdict
The clearest difference is price: WATTSTUNDE NOVA at Free against Roll Alarm's $1.99. WATTSTUNDE NOVA also leads on update cadence (every 3 weeks vs every 27 months) and iOS requirement (11.0 vs 15.0). On ads, in-app purchases 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
WATTSTUNDE NOVA is free to download; Roll Alarm costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Roll Alarm ships an update every 27 months, WATTSTUNDE NOVA every 3 weeks. The most recent releases landed on October 20, 2026 and October 11, 2026 respectively.
| Parameter | Roll Alarm | WATTSTUNDE NOVA |
|---|---|---|
| Price | $1.99 | Free — better |
| Positive reviews | — | 14.8% of reviews |
| Update frequency | Every 27 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Stevens Marketing Limited | WATTSTUNDE GmbH |
In-app purchases
Roll Alarm
No in-app purchases
WATTSTUNDE NOVA
No in-app purchases
Questions
Is Roll Alarm free?
Is WATTSTUNDE NOVA free?
Do Roll Alarm or WATTSTUNDE NOVA have ads?
Which is updated more often, Roll Alarm or WATTSTUNDE NOVA?
Other comparisons
