# Resistor Color Band Calc vs SpoolStack

The clearest difference is in-app purchases: Resistor Color Band Calc at none against SpoolStack's 2. Resistor Color Band Calc also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). SpoolStack's advantage is ads (none vs shown) and update cadence (every 2 days vs every 2 weeks). On price there is nothing between them.

Both are free to download. SpoolStack sells 2 in-app purchases, starting at $4.99 per month. Resistor Color Band Calc asks for nothing beyond the download.

Resistor Color Band Calc ships an update every 2 weeks, SpoolStack every 2 days. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Resistor Color Band Calc | SpoolStack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Size | 51 MB | 13 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [博 彭](https://appshunter.io/developer/1293268076) | [Matthew Howell](https://appshunter.io/developer/1744641447) |

## What reviewers say

### Resistor Color Band Calc

[App page](https://appshunter.io/ios/app/resistor-color-band-calc/id6473075098)

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

**In-app purchases:** none


### SpoolStack

[App page](https://appshunter.io/ios/app/spoolstack/id6762043296)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SpoolStack Pro Monthly | $4.99 | per month |
| SpoolStack Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is Resistor Color Band Calc free?

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

### Is SpoolStack free?

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

### Do Resistor Color Band Calc or SpoolStack have ads?

Resistor Color Band Calc shows ads; SpoolStack does not.

### Which is updated more often, Resistor Color Band Calc or SpoolStack?

Resistor Color Band Calc ships an update every 2 weeks, and SpoolStack every 2 days. Most recently, Resistor Color Band Calc was updated on October 27, 2026 and SpoolStack on October 12, 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.*