# GridMind Power vs SunStem

The clearest difference is in-app purchases: SunStem at none against GridMind Power's 2. SunStem also leads on iOS requirement (17.0 vs 26.0). GridMind Power's advantage is update cadence (every 2 days vs weekly). On price, ads and device support there is nothing between them.

Both are free to download. GridMind Power sells 2 in-app purchases, starting at $2.99 per month. SunStem asks for nothing beyond the download.

GridMind Power ships an update every 2 days, SunStem weekly. Both last shipped on October 28, 2026.

## The numbers

| Metric | GridMind Power | SunStem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/gridmind-power/id6760313965/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | Freemium | — |
| Size | 26 MB | 7 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Scott Brant](https://appshunter.io/developer/1882781093) | [Dmitriy Motorin](https://appshunter.io/developer/1495533596) |

## What reviewers say

### GridMind Power

[App page](https://appshunter.io/ios/app/gridmind-power/id6760313965)

Gain full insight and control over your home's energy system, including solar panels, battery storage, and EV charging. Monitor real-time power flow, optimize battery usage for peak rates, and track financial gains and solar production forecasts.

**Highlights:** Real-time power flow visualization, Smart peak optimization for battery export, EV charging monitoring and control, Financial tracking of energy earnings, 7-day solar production forecasting, Customizable automation rules

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GridMind Pro | $2.99 | per month |
| GridMind Pro (Annual) | $29.99 | per year |


### SunStem

[App page](https://appshunter.io/ios/app/sunstem-solar-calculator/id6787007719)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GridMind Power free?

GridMind Power is free to download, with in-app purchases available.

### Is SunStem free?

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

### Do GridMind Power or SunStem have ads?

Neither GridMind Power nor SunStem shows ads.

### Which is updated more often, GridMind Power or SunStem?

GridMind Power ships an update every 2 days, and SunStem weekly. Most recently, GridMind Power was updated on October 28, 2026 and SunStem on October 28, 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.*