NB vs Royal Conversion Battery
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NB
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Official app for setting up the Steamrock NB-42 Digital Barometer using NFC.
Royal Conversion Battery
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The App is an easy-to-use device that visibly and effectively displays how long the battery's charge or discharge will last. It also calculates how much power the battery has versus how much charge is going out, while providing the approximate amount of time the battery will remain charged. There is a wide range of battery monitors, depending on the specific application. Some of the more identifiable monitors include RV battery monitors, marine battery monitors and car battery monitoring systems.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | NB | Royal Conversion Battery |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 43 MB |
| Age rating | 17+ | 4+ |
| Developer | Steamrock Inc. | Sterling Power |
In-app purchases
NB
No in-app purchases
Royal Conversion Battery
No in-app purchases
Questions
Is NB free?
Is Royal Conversion Battery free?
Do NB or Royal Conversion Battery have ads?
Which is updated more often, NB or Royal Conversion Battery?
Other comparisons
