# Keyguard vs Hydraulic schemes

The clearest difference is price: Keyguard at Free against Hydraulic schemes's $0.99. Keyguard also leads on in-app purchases (none vs 1). Hydraulic schemes's advantage is rating (5.0 vs 3.0) and update cadence (every 2 weeks vs every 2 months). On ratings volume, ads, device support and iOS requirement there is nothing between them.

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

Hydraulic schemes holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Keyguard ships an update every 2 months, Hydraulic schemes every 2 weeks. The most recent releases landed on November 2, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Keyguard | Hydraulic schemes |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/keyguard/id1402767401/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-schemes/id1602894931/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 76.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 22 MB | 10 MB |
| Requires iOS | **10.3** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Miguel Maximiliano Vanzetti](https://appshunter.io/developer/1353370420) | [Angel Martinez](https://appshunter.io/developer/1446956865) |

## What reviewers say

### Keyguard

[App page](https://appshunter.io/ios/app/keyguard/id1402767401)

This app streamlines vehicle key management for dealerships using QR codes. It offers a quick and agile system for tracking and organizing keys, improving operational efficiency.

**Highlights:** QR code key management, Vehicle key tracking, Dealership inventory, Agile administration, Fast organization

**Features:** macOS Compatibility

**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 Keyguard free?

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

### Is Hydraulic schemes free?

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

### Which has better reviews, Keyguard or Hydraulic schemes?

Hydraulic schemes is rated higher. Keyguard averages 3.0 out of 5 from 1 ratings, while Hydraulic schemes averages 5.0 from 1 ratings.

### Do Keyguard or Hydraulic schemes have ads?

Neither Keyguard nor Hydraulic schemes shows ads.

### Which is updated more often, Keyguard or Hydraulic schemes?

Keyguard ships an update every 2 months, and Hydraulic schemes every 2 weeks. Most recently, Keyguard was updated on November 2, 2026 and Hydraulic schemes on November 12, 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.*