# SolarAlign Pro vs Resistor Decoder

The clearest difference is in-app purchases: Resistor Decoder at none against SolarAlign Pro's 2. Resistor Decoder also leads on update cadence (every 9 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SolarAlign Pro sells 2 in-app purchases, starting at $4.99 per month. Resistor Decoder asks for nothing beyond the download.

SolarAlign Pro ships an update monthly, Resistor Decoder every 9 days. The most recent releases landed on October 5, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | SolarAlign Pro | Resistor Decoder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Size | 29 MB | 72 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +17 | 4+ |
| Developer | [Edry Garcia](https://appshunter.io/developer/1843024177) | [ESDEV Teknoloji](https://appshunter.io/developer/1693053468) |

## What reviewers say

### SolarAlign Pro

[App page](https://appshunter.io/ios/app/solaralign-pro-sun-and-tilt/id6761153513)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $29.99 | per year |


### Resistor Decoder

[App page](https://appshunter.io/ios/app/resistor-decoder/id6786609623)

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

**In-app purchases:** none


## Frequently asked questions

### Is SolarAlign Pro free?

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

### Is Resistor Decoder free?

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

### Do SolarAlign Pro or Resistor Decoder have ads?

Neither SolarAlign Pro nor Resistor Decoder shows ads.

### Which is updated more often, SolarAlign Pro or Resistor Decoder?

SolarAlign Pro ships an update monthly, and Resistor Decoder every 9 days. Most recently, SolarAlign Pro was updated on October 5, 2026 and Resistor Decoder on September 30, 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.*