# Hydraulic schemes vs PHD Actuator Sizing

The clearest difference is price: PHD Actuator Sizing at Free against Hydraulic schemes's $0.99. PHD Actuator Sizing also leads on in-app purchases (none vs 1). Hydraulic schemes's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.6). On rating, ratings volume, update cadence and ads there is nothing between them.

PHD Actuator Sizing is free to download; Hydraulic schemes costs $0.99 up front. Hydraulic schemes sells 1 one-off in-app purchase. PHD Actuator Sizing asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Hydraulic schemes against 5.0 for PHD Actuator Sizing. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Hydraulic schemes ships an update every 2 weeks, PHD Actuator Sizing every 3 weeks. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Hydraulic schemes | PHD Actuator Sizing |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-schemes/id1602894931/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/phd-actuator-sizing/id6759474917/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 1 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Angel Martinez](https://appshunter.io/developer/1446956865) | [Krishna Meruva](https://appshunter.io/developer/1864409993) |

## What reviewers say

### Hydraulic schemes

[App page](https://appshunter.io/ios/app/hydraulic-schemes/id1602894931)

Easily design hydraulic, heating, cooling, and air conditioning schematics. Drag and drop symbols to quickly build your diagrams. Save and edit your work with the PRO version.

**Highlights:** Create hydraulic schemes, Drag and drop symbol placement, Extensive symbol library, Save and edit schemes (PRO), Export as image or PDF, Multiple HVAC system support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads, save/edit diagram | $3.99 | one-time |


### PHD Actuator Sizing

[App page](https://appshunter.io/ios/app/phd-actuator-sizing/id6759474917)

This engineering tool helps automation professionals quickly size servo motors for industrial applications. It allows users to input motion profiles and automatically calculates torque and inertia for accurate motor selection. Generate detailed reports and verify performance against motor specifications.

**Highlights:** Select from full actuator lineup, Input motion profiles, Automatic RMS torque calculations, Inertia ratio verification, Peak torque and speed checks, Exportable sizing reports

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic schemes free?

Hydraulic schemes costs $0.99, and also offers in-app purchases.

### Is PHD Actuator Sizing free?

PHD Actuator Sizing is free to download, with no in-app purchases.

### Which has better reviews, Hydraulic schemes or PHD Actuator Sizing?

Hydraulic schemes and PHD Actuator Sizing are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Hydraulic schemes or PHD Actuator Sizing have ads?

Neither Hydraulic schemes nor PHD Actuator Sizing shows ads.

### Which is updated more often, Hydraulic schemes or PHD Actuator Sizing?

Hydraulic schemes ships an update every 2 weeks, and PHD Actuator Sizing every 3 weeks. Most recently, Hydraulic schemes was updated on November 7, 2026 and PHD Actuator Sizing on October 31, 2026.

---

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