# SolarZero vs Swim Legion

The clearest difference is iOS requirement: Swim Legion at 15.0 against SolarZero's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SolarZero ships an update monthly, Swim Legion every 3 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SolarZero | Swim Legion |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 35.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 22 MB | 8 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [solarZero Limited](https://appshunter.io/developer/1283894275) | [NZ Marketing Group Limited](https://appshunter.io/developer/1431905765) |

## What reviewers say

### SolarZero

[App page](https://appshunter.io/ios/app/solarzero/id6504657190)

Monitor and optimize your home's solar energy system with real-time data on energy generation and usage. Track carbon savings, access energy-saving modes, and refer friends to the service.

**Highlights:** Real-time energy generation and usage data, Energy import/export status updates, Carbon savings and footprint tracking, Hot water energy saving mode, Refer-a-Friend program

**In-app purchases:** none


### Swim Legion

[App page](https://appshunter.io/ios/app/swim-legion/id6745898001)

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

**In-app purchases:** none


## Frequently asked questions

### Is SolarZero free?

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

### Is Swim Legion free?

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

### Do SolarZero or Swim Legion have ads?

Neither SolarZero nor Swim Legion shows ads.

### Which is updated more often, SolarZero or Swim Legion?

SolarZero ships an update monthly, and Swim Legion every 3 weeks. Most recently, SolarZero was updated on November 4, 2026 and Swim Legion on October 30, 2026.

---

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