# VSP vs SolarZero

The clearest difference is review sentiment: SolarZero at 36% against VSP's 11%. SolarZero also leads on update cadence (monthly vs every 3 months). VSP's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

VSP ships an update every 3 months, SolarZero monthly. The most recent releases landed on September 14, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | VSP | SolarZero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.2 (18 ratings)](https://appshunter.io/ios/app/vsp/id1364393567/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 11.1% of reviews | **35.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 103 MB | 22 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [D T S Limited](https://appshunter.io/developer/1359605100) | [solarZero Limited](https://appshunter.io/developer/1283894275) |

## What reviewers say

### VSP

[App page](https://appshunter.io/ios/app/vsp/id1364393567)

This VoIP softphone connects to the VSP Platform, requiring an administrator-generated account for login. It allows enterprises and operators to manage softphone settings and configurations. Emergency call functionality is limited and not intended for such use.

**Highlights:** VoIP softphone client, VSP Platform integration, Administrator account required, Enterprise provisioning, Softphone settings management, Limited emergency call handling

**Features:** macOS Compatibility, Siri integration

**In-app purchases:** none


### 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


## Frequently asked questions

### Is VSP free?

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

### Is SolarZero free?

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

### Do VSP or SolarZero have ads?

Neither VSP nor SolarZero shows ads.

### Which is updated more often, VSP or SolarZero?

VSP ships an update every 3 months, and SolarZero monthly. Most recently, VSP was updated on September 14, 2026 and SolarZero on September 8, 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.*