# HgBarometer vs NB

HgBarometer and NB 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.

HgBarometer ships an update every 4 months, NB every 8 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | HgBarometer | NB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/hgbarometer/id1234010346/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 8 months |
| Monetization | Free | — |
| Size | 8 MB | 18 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Michael Matus](https://appshunter.io/developer/987936850) | [Steamrock Inc.](https://appshunter.io/developer/1705604272) |

## What reviewers say

### HgBarometer

[App page](https://appshunter.io/ios/app/hgbarometer/id1234010346)

This app assists users of mercury barometers by simplifying pressure calculations. It helps determine barometric pressure by accounting for meniscus height, instrument temperature, and local gravity. It also offers unit conversions and can be used to calibrate barometers.

**Highlights:** Simplifies mercury barometer pressure calculations, Accounts for meniscus height, temperature, and gravity, Supports multiple pressure units, Facilitates barometer calibration, Allows sharing of observations and results

**Features:** macOS Compatibility

**In-app purchases:** none


### NB

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

**In-app purchases:** none


## Frequently asked questions

### Is HgBarometer free?

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

### Is NB free?

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

### Do HgBarometer or NB have ads?

Neither HgBarometer nor NB shows ads.

### Which is updated more often, HgBarometer or NB?

HgBarometer ships an update every 4 months, and NB every 8 months. Most recently, HgBarometer was updated on October 29, 2026 and NB on October 27, 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.*