# Roll Alarm vs WATTSTUNDE NOVA

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.

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.

## The numbers

| Metric | Roll Alarm | WATTSTUNDE NOVA |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | — | 14.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 55 MB | 9 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stevens Marketing Limited](https://appshunter.io/developer/1467103925) | [WATTSTUNDE GmbH](https://appshunter.io/developer/1469009647) |

## What reviewers say

### Roll Alarm

[App page](https://appshunter.io/ios/app/roll-alarm/id1473896487)

**Features:** macOS Compatibility

**In-app purchases:** none


### WATTSTUNDE NOVA

[App page](https://appshunter.io/ios/app/wattstunde-nova/id6480045065)

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.

**Highlights:** Bluetooth 5.0 BLE connectivity, Monitor voltage, current, temperature, Track cycle life, Real-time data display, Connect to one battery at a time

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Roll Alarm free?

Roll Alarm costs $1.99, with no in-app purchases.

### Is WATTSTUNDE NOVA free?

WATTSTUNDE NOVA is free to download, with no in-app purchases.

### Do Roll Alarm or WATTSTUNDE NOVA have ads?

Neither Roll Alarm nor WATTSTUNDE NOVA shows ads.

### Which is updated more often, Roll Alarm or WATTSTUNDE NOVA?

Roll Alarm ships an update every 27 months, and WATTSTUNDE NOVA every 3 weeks. Most recently, Roll Alarm was updated on October 20, 2026 and WATTSTUNDE NOVA on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*