# Grace Solar vs FourStage

The clearest difference is update cadence: Grace Solar at fortnightly against FourStage's every 4 months. Grace Solar also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Grace Solar ships an update fortnightly, FourStage every 4 months. The most recent releases landed on October 7, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Grace Solar | FourStage |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Size | 71 MB | 149 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [AHASOLAR TECHNOLOGIES LIMITED](https://appshunter.io/developer/1632224285) | [Vertical Axion, LLC](https://appshunter.io/developer/1697138155) |

## What reviewers say

### Grace Solar

[App page](https://appshunter.io/ios/app/grace-solar/id1489691070)

**In-app purchases:** none


### FourStage

[App page](https://appshunter.io/ios/app/fourstage/id6451203518)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Grace Solar free?

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

### Is FourStage free?

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

### Do Grace Solar or FourStage have ads?

Neither Grace Solar nor FourStage shows ads.

### Which is updated more often, Grace Solar or FourStage?

Grace Solar ships an update fortnightly, and FourStage every 4 months. Most recently, Grace Solar was updated on October 7, 2026 and FourStage on October 5, 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.*