# Solar APP vs Resistor

The clearest difference is review sentiment: Resistor at 50% against Solar APP's 0%. Resistor also leads on in-app purchases (none vs 2) and iOS requirement (13.0 vs 16.0). Solar APP's advantage is rating (4.5 vs 3.0) and update cadence (every 4 months vs every 16 months). On price, ads and device support there is nothing between them.

Both are free to download. Solar APP sells 2 in-app purchases, starting at $9.99 per month. Resistor asks for nothing beyond the download.

Solar APP holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Solar APP has 46 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 0% of Solar APP's written reviews are positive against 50% of Resistor's, so the app with the better star average is not the one people write more warmly about.

Solar APP ships an update every 4 months, Resistor every 16 months. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Solar APP | Resistor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (46 ratings)](https://appshunter.io/ios/app/solar-app-pv-solar-calculator/id6451967917/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625/reviews) |
| Number of ratings | **46** | 3 |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 4 months** | Every 16 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 17 MB | 22 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Igor Ilijovski](https://appshunter.io/developer/1492982127) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### Solar APP

[App page](https://appshunter.io/ios/app/solar-app-pv-solar-calculator/id6451967917)

This tool provides comprehensive solar energy analysis, including system design, battery storage optimization, and real-time utility price tracking. Generate detailed PDF reports for your solar projects to make informed decisions and maximize savings.

**Highlights:** PDF Report Generation, Battery Storage System Optimization, Ultimate Solar Analysis, Optimal Power Calculation, Utility Consumption and Price Analysis

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Solar APP Premium 1 Month | $9.99 | per month |
| Solar APP Premium 12 Months | $39.99 | per year |


### Resistor

[App page](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625)

This application simplifies electronic circuit calculations with tools for series/parallel resistance, LED current limiting, and three-phase circuit conversions. It also features a resistor color code decoder for quick component identification.

**Highlights:** Series/parallel resistor calculator, LED series resistor calculator, Star-delta and delta-star converters, Resistor color code decoder, Intuitive interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Solar APP free?

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

### Is Resistor free?

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

### Which has better reviews, Solar APP or Resistor?

Solar APP is rated higher. Solar APP averages 4.5 out of 5 from 46 ratings, while Resistor averages 3.0 from 3 ratings.

### Do Solar APP or Resistor have ads?

Both Solar APP and Resistor show ads.

### Which is updated more often, Solar APP or Resistor?

Solar APP ships an update every 4 months, and Resistor every 16 months. Most recently, Solar APP was updated on November 3, 2026 and Resistor 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.*