# SolarCalc vs Voltbox

The clearest difference is in-app purchases: SolarCalc at none against Voltbox's 1. SolarCalc also leads on update cadence (every 2 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Voltbox sells 1 one-off in-app purchase. SolarCalc asks for nothing beyond the download.

SolarCalc ships an update every 2 days, Voltbox every 3 months. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | SolarCalc | Voltbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 months |
| Size | 31 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mustafa CALISKANOZTURK](https://appshunter.io/developer/6791932527) | [GABRIELE CHESI](https://appshunter.io/developer/6793043905) |

## What reviewers say

### SolarCalc

[App page](https://appshunter.io/ios/app/solarcalc-pv-panel-and-battery/id6797648664)

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

**In-app purchases:** none


### Voltbox

[App page](https://appshunter.io/ios/app/voltbox-pv-installer-toolkit/id6798591811)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $8.99 | one-time |


## Frequently asked questions

### Is SolarCalc free?

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

### Is Voltbox free?

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

### Do SolarCalc or Voltbox have ads?

Neither SolarCalc nor Voltbox shows ads.

### Which is updated more often, SolarCalc or Voltbox?

SolarCalc ships an update every 2 days, and Voltbox every 3 months. Most recently, SolarCalc was updated on October 31, 2026 and Voltbox on November 6, 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.*