# Inrock HDD HydroCalc vs Einpro

The clearest difference is update cadence: Einpro at every 3 days against Inrock HDD HydroCalc's every 6 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Inrock HDD HydroCalc ships an update every 6 months, Einpro every 3 days. The most recent releases landed on October 3, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Inrock HDD HydroCalc | Einpro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/inrock-hdd-hydrocalc/id6741412479/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 51 MB | 48 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Inrock Drilling Systems](https://appshunter.io/developer/1794059592) | [Einlogica Solutions Private Limited](https://appshunter.io/developer/1762129938) |

## What reviewers say

### Inrock HDD HydroCalc

[App page](https://appshunter.io/ios/app/inrock-hdd-hydrocalc/id6741412479)

This app helps Horizontal Directional Drilling professionals optimize hydraulic energy for efficient cuttings removal. It calculates key parameters to improve tool cleaning, reduce wear, and maximize bearing life. Features include comprehensive calculations, side-by-side case comparisons, and dynamic charting.

**Highlights:** Comprehensive hydraulic calculations, Side-by-side case comparisons, Dynamic charting and summaries, Unit conversion flexibility, User-friendly three-screen interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Einpro

[App page](https://appshunter.io/ios/app/einpro/id6748364522)

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

**In-app purchases:** none


## Frequently asked questions

### Is Inrock HDD HydroCalc free?

Inrock HDD HydroCalc is free to download, with no in-app purchases.

### Is Einpro free?

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

### Do Inrock HDD HydroCalc or Einpro have ads?

Neither Inrock HDD HydroCalc nor Einpro shows ads.

### Which is updated more often, Inrock HDD HydroCalc or Einpro?

Inrock HDD HydroCalc ships an update every 6 months, and Einpro every 3 days. Most recently, Inrock HDD HydroCalc was updated on October 3, 2026 and Einpro on October 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*