# PV Master vs iEMS

The clearest difference is in-app purchases: iEMS at none against PV Master's 4. iEMS also leads on iOS requirement (13.0 vs 17.0). PV Master's advantage is update cadence (every 8 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. PV Master sells 4 in-app purchases, starting at $4.99 per month. iEMS asks for nothing beyond the download.

PV Master ships an update every 8 days, iEMS every 4 months. Both last shipped on September 16, 2026.

## The numbers

| Metric | PV Master | iEMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (23 ratings)](https://appshunter.io/ios/app/pv-master-solar-panel-system/id396636193/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 17.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 25 MB | 41 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BigBalli Consulting llc](https://appshunter.io/developer/363765325) | [Shenzhen ZTE Software Co., Ltd.](https://appshunter.io/developer/1863573894) |

## What reviewers say

### PV Master

[App page](https://appshunter.io/ios/app/pv-master-solar-panel-system/id396636193)

This app helps you harness solar energy by providing accurate solar data, weather integration, and tools to optimize your solar panel setup. It offers comprehensive calculators for energy needs, panel requirements, and battery storage, along with guides and a glossary for informed decisions.

**Highlights:** Accurate solar data based on location, Weather data integration, Solar potential insights, Panel positioning tool, Comprehensive energy calculators, Guides, FAQs, and glossary

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Unlock | $4.99 | per month |
| Yearly | $49.99 | per year |
| Location Solar Panel Data | $0.99 | one-time |
| Lifetime | $59.99 | one-time |


### iEMS

[App page](https://appshunter.io/ios/app/iems/id6450133373)

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

**In-app purchases:** none


## Frequently asked questions

### Is PV Master free?

PV Master is free to download, with in-app purchases available.

### Is iEMS free?

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

### Do PV Master or iEMS have ads?

Neither PV Master nor iEMS shows ads.

### Which is updated more often, PV Master or iEMS?

PV Master ships an update every 8 days, and iEMS every 4 months. Most recently, PV Master was updated on September 16, 2026 and iEMS on September 16, 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.*