# NB vs Royal Conversion Battery

NB and Royal Conversion Battery are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NB ships an update every 8 months, Royal Conversion Battery every 12 months. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | NB | Royal Conversion Battery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 12 months |
| Size | 18 MB | 43 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Steamrock Inc.](https://appshunter.io/developer/1705604272) | [Sterling Power](https://appshunter.io/developer/1639822244) |

## What reviewers say

### NB

[App page](https://appshunter.io/ios/app/nb-42-barometer/id6503903082)

**In-app purchases:** none


### Royal Conversion Battery

[App page](https://appshunter.io/ios/app/royal-conversion-battery/id6740916550)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NB free?

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

### Is Royal Conversion Battery free?

Royal Conversion Battery is free to download, with no in-app purchases.

### Do NB or Royal Conversion Battery have ads?

Neither NB nor Royal Conversion Battery shows ads.

### Which is updated more often, NB or Royal Conversion Battery?

NB ships an update every 8 months, and Royal Conversion Battery every 12 months. Most recently, NB was updated on October 27, 2026 and Royal Conversion Battery on October 28, 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.*