# Netzero for Powerwall vs CalaWater

The clearest difference is in-app purchases: CalaWater at none against Netzero for Powerwall's 2. CalaWater also leads on review sentiment (100% vs 90%). Netzero for Powerwall's advantage is ratings volume (801 vs 6) and update cadence (weekly vs every 2 weeks). On price, rating, ads and device support there is nothing between them.

Both are free to download. Netzero for Powerwall sells 2 in-app purchases, starting at $6.99 per month. CalaWater asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Netzero for Powerwall against 4.8 for CalaWater. That said, the two scores are not equally well evidenced: Netzero for Powerwall has 801 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 90% of Netzero for Powerwall's written reviews are positive against 100% of CalaWater's.

Netzero for Powerwall ships an update weekly, CalaWater every 2 weeks. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Netzero for Powerwall | CalaWater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (801 ratings)](https://appshunter.io/ios/app/netzero-for-powerwall/id6453293821/reviews) | **[4.8 (6 ratings)](https://appshunter.io/ios/app/calawater/id6670616817/reviews)** |
| Number of ratings | **801** | 6 |
| Positive reviews | 90.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Freemium | **Free** |
| Size | 61 MB | 59 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Netzero Labs, Inc](https://appshunter.io/developer/1725678179) | [Cala Systems, Inc.](https://appshunter.io/developer/1736816264) |

## What reviewers say

### Netzero for Powerwall

[App page](https://appshunter.io/ios/app/netzero-for-powerwall/id6453293821)

Automate your home energy system to maximize savings and monitor your Powerwall's health. Integrate with utility providers for dynamic pricing and receive alerts for solar or battery issues. Gain insights into energy production and use your device as a home energy dashboard.

**Highlights:** Powerwall automation and scheduling, Utility tariff integration, Solar production monitoring, Powerwall health alerts, Home energy dashboard, Advanced diagnostics

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Netzero Pro - Monthly | $6.99 | per month |
| Netzero Pro - Annual | $69.99 | per year |

**What reviewers like**

- 🚀 Indispensable for home energy nerds
- 🚀 Amazing Diagnostic Tool
- 🚀 Awesome app to extend Tesla capabilities
- 🚀 Outstanding
- 🚀 Great App + Great Support

**What reviewers complain about**

- 🐛 Something changed?
- 🔧 Good but needs more tariff options
- 🐛 May not be compatible with PW3
- 🐛 Difficult

**Reported bugs**

- May not be compatible with PW3
- Diagnostic screen stays black

**Requested features**

- stop battery charging?
- AND function on the conditionality


### CalaWater

[App page](https://appshunter.io/ios/app/calawater/id6670616817)

Monitor and control your intelligent heat pump water heater remotely. Track usage, optimize heating schedules for solar production or vacation, and ensure hot water availability. Receive ongoing system updates for improved performance.

**Highlights:** Track hot water usage patterns, Sync heating with solar production, View energy usage, Boost production on demand, Schedule vacation energy savings, Monitor real-time availability and performance, Configure system run times

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Netzero for Powerwall free?

Netzero for Powerwall is free to download, with in-app purchases available.

### Is CalaWater free?

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

### Which has better reviews, Netzero for Powerwall or CalaWater?

CalaWater is rated higher. Netzero for Powerwall averages 4.8 out of 5 from 801 ratings, while CalaWater averages 4.8 from 6 ratings.

### Do Netzero for Powerwall or CalaWater have ads?

Neither Netzero for Powerwall nor CalaWater shows ads.

### Which is updated more often, Netzero for Powerwall or CalaWater?

Netzero for Powerwall ships an update weekly, and CalaWater every 2 weeks. Most recently, Netzero for Powerwall was updated on October 27, 2026 and CalaWater on October 24, 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.*