# Hydrostatic Pressure Calc vs CORE Calculator App

The clearest difference is price: CORE Calculator App at Free against Hydrostatic Pressure Calc's $2.99. CORE Calculator App also leads on update cadence (every 3 months vs every 31 months) and ratings volume (11 vs 1). Hydrostatic Pressure Calc's advantage is in-app purchases (none vs 3). On rating, ads, device support and iOS requirement there is nothing between them.

CORE Calculator App is free to download; Hydrostatic Pressure Calc costs $2.99 up front. CORE Calculator App sells 3 in-app purchases, starting at $4.99 per month. Hydrostatic Pressure Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Hydrostatic Pressure Calc against 5.0 for CORE Calculator App. That said, the two scores are not equally well evidenced: CORE Calculator App has 11 ratings behind it against 1, so its average is the more settled of the two.

Hydrostatic Pressure Calc ships an update every 31 months, CORE Calculator App every 3 months. The most recent releases landed on October 12, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Hydrostatic Pressure Calc | CORE Calculator App |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrostatic-pressure-calc/id1420384357/reviews) | [5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews) |
| Number of ratings | 1 | **11** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 3 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 148 MB |
| Requires iOS | **13** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [AsInt Inc.](https://appshunter.io/developer/1438397626) |

## What reviewers say

### Hydrostatic Pressure Calc

[App page](https://appshunter.io/ios/app/hydrostatic-pressure-calc/id1420384357)

Quickly calculate hydrostatic pressure at any depth with this physics tool. It offers instant results, supports various units, and displays the relevant formulas for reference. Optimized for ease of use and accuracy.

**Highlights:** Instant hydrostatic pressure calculation, Supports multiple input units, Includes hydrostatic pressure formulas, Results are copyable, High precision up to 16 decimal places, Lightweight and optimized

**Features:** macOS Compatibility

**In-app purchases:** none


### CORE Calculator App

[App page](https://appshunter.io/ios/app/core-calculator-app/id1447118499)

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

**Highlights:** Tmin calculations, MAWP calculations, Corrosion rate calculations, Remaining life determination, Construction material information, Damage mechanism identification

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Materials Lookup | $4.99 | per month |
| Damage Mech Screener | $9.99 | per month |
| Materials Lookup | $5.99 | one-time |


## Frequently asked questions

### Is Hydrostatic Pressure Calc free?

Hydrostatic Pressure Calc costs $2.99, with no in-app purchases.

### Is CORE Calculator App free?

CORE Calculator App is free to download, with in-app purchases available.

### Which has better reviews, Hydrostatic Pressure Calc or CORE Calculator App?

Hydrostatic Pressure Calc and CORE Calculator App are both rated 5.0 out of 5 on the App Store, from 1 and 11 ratings respectively.

### Do Hydrostatic Pressure Calc or CORE Calculator App have ads?

Neither Hydrostatic Pressure Calc nor CORE Calculator App shows ads.

### Which is updated more often, Hydrostatic Pressure Calc or CORE Calculator App?

Hydrostatic Pressure Calc ships an update every 31 months, and CORE Calculator App every 3 months. Most recently, Hydrostatic Pressure Calc was updated on October 12, 2026 and CORE Calculator App on October 17, 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.*