# Combi Valve Sizer vs Hydraulic schemes

The clearest difference is review sentiment: Hydraulic schemes at 77% against Combi Valve Sizer's 0%. Hydraulic schemes also leads on update cadence (every 2 weeks vs every 9 months). Combi Valve Sizer's advantage is price (Free vs $0.99) and in-app purchases (none vs 1). On ads and device support there is nothing between them.

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

Combi Valve Sizer ships an update every 9 months, Hydraulic schemes every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Combi Valve Sizer | Hydraulic schemes |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-schemes/id1602894931/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | **76.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 50 MB | 10 MB |
| Requires iOS | **7.0** | 11.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [Angel Martinez](https://appshunter.io/developer/1446956865) |

## What reviewers say

### Combi Valve Sizer

[App page](https://appshunter.io/ios/app/combi-valve-sizer/id504270106)

This app simplifies the selection of specific HVAC components. It guides users through choosing the correct valve and actuator, calculates flow rates, and assists with presetting and commissioning. Users can also tag components and download reports.

**Highlights:** Guided valve and actuator selection, Valve sizing and flow calculation, Valve presetting calculation, Tagging valve location and designation, Commissioning check with reports, Data sheet downloads, Report sharing

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Combi Valve Sizer free?

Combi Valve Sizer is free to download, with no in-app purchases.

### Is Hydraulic schemes free?

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

### Do Combi Valve Sizer or Hydraulic schemes have ads?

Neither Combi Valve Sizer nor Hydraulic schemes shows ads.

### Which is updated more often, Combi Valve Sizer or Hydraulic schemes?

Combi Valve Sizer ships an update every 9 months, and Hydraulic schemes every 2 weeks. Most recently, Combi Valve Sizer was updated on October 25, 2026 and Hydraulic schemes on October 25, 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.*