# i.Solar vs Construction Calc

The clearest difference is in-app purchases: i.Solar at none against Construction Calc's 1. i.Solar also leads on update cadence (weekly vs every 2 months) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Construction Calc sells 1 one-off in-app purchase. i.Solar asks for nothing beyond the download.

i.Solar ships an update weekly, Construction Calc every 2 months. The most recent releases landed on October 10, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | i.Solar | Construction Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (9 ratings)](https://appshunter.io/ios/app/isolar/id1632580672/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free | — |
| Size | 51 MB | 15 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Trusted UPS Manufacturing Company](https://appshunter.io/developer/1632202346) | [Alona Nesterenko](https://appshunter.io/developer/1890650834) |

## What reviewers say

### i.Solar

[App page](https://appshunter.io/ios/app/isolar/id1632580672)

Monitor your inverters remotely with real-time data and control capabilities. This app allows for daily data tracking, command sending, and remote device management.

**Highlights:** Daily data monitoring, Real-time data enquiry, Command sending, Remote device control

**Features:** Vision Pro support

**In-app purchases:** none


### Construction Calc

[App page](https://appshunter.io/ios/app/construction-calc-toolbox/id6792015651)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $7.99 | one-time |


## Frequently asked questions

### Is i.Solar free?

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

### Is Construction Calc free?

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

### Do i.Solar or Construction Calc have ads?

Neither i.Solar nor Construction Calc shows ads.

### Which is updated more often, i.Solar or Construction Calc?

i.Solar ships an update weekly, and Construction Calc every 2 months. Most recently, i.Solar was updated on October 10, 2026 and Construction Calc on October 11, 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.*