# resistor code calculator+ vs Smart Photos Backup

The clearest difference is in-app purchases: resistor code calculator+ at none against Smart Photos Backup's 1. resistor code calculator+ also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). Smart Photos Backup's advantage is update cadence (every 5 days vs every 3 weeks). On price and ads there is nothing between them.

Both are free to download. Smart Photos Backup sells 1 one-off in-app purchase. resistor code calculator+ asks for nothing beyond the download.

resistor code calculator+ ships an update every 3 weeks, Smart Photos Backup every 5 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | resistor code calculator+ | Smart Photos Backup |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/resistor-code-calculator-plus/id6741751785/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 25 MB | 13 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [佳 黄](https://appshunter.io/developer/513202662) | [晓敏 蔡](https://appshunter.io/developer/1535305622) |

## What reviewers say

### resistor code calculator+

[App page](https://appshunter.io/ios/app/resistor-code-calculator-plus/id6741751785)

Quickly determine resistor values using the standard color-coding system. Ideal for electronics enthusiasts, students, and makers working on projects. Instantly calculates resistance without needing to memorize color codes.

**Highlights:** Calculates 3, 4, 5, and 6-band resistors, Easy-to-use interface, Industry-standard color codes, Instant value calculation, Reference for electronics projects

**In-app purchases:** none


### Smart Photos Backup

[App page](https://appshunter.io/ios/app/smart-photos-backup/id6794347585)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Photos Backup Pro | $1.99 | one-time |


## Frequently asked questions

### Is resistor code calculator+ free?

resistor code calculator+ is free to download, with no in-app purchases.

### Is Smart Photos Backup free?

Smart Photos Backup is free to download, with in-app purchases available.

### Do resistor code calculator+ or Smart Photos Backup have ads?

Neither resistor code calculator+ nor Smart Photos Backup shows ads.

### Which is updated more often, resistor code calculator+ or Smart Photos Backup?

resistor code calculator+ ships an update every 3 weeks, and Smart Photos Backup every 5 days. Most recently, resistor code calculator+ was updated on October 28, 2026 and Smart Photos Backup on October 31, 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.*