Keyguard vs Hydraulic schemes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keyguard
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.
- QR code key management
- Vehicle key tracking
- Dealership inventory
- Agile administration
- Fast organization
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Keyguard es una aplicación especialmente diseñada para administrar las llaves de los vehículos en los concesionarios, permitiendo una ágil y rápida administración mediante la utilización de códigos QR.
Hydraulic schemes
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.
- 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
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This tool will allow you to create your own hydraulic scheme (heat, cold, air conditioning) quickly and easily, you simply have to select the symbol you want to use, drag and drop it in the desired position. Symbols: Valves: 2, 3 and 4-way, mixing, control, balancing, butterfly, gate, safety, overflow, non-return, thermostatic, pump, flowmeter, meter, flow switch, pressure gauge, air and dirty separator, drain, temperature probe, boiler, heat pump, indoor and outdoor unit, accumulator, inter-accumulator, heat and cold exchanger, collector, thermostat, radiator, underfloor heating, pressure reducer, filter, resistor, sleeve, tap, buffer tank, gas, solar panels, coil, oven, swimming pool, emitters. # BASIC Version # * You can create your scheme with the same symbols as the Version PRO * You can only work with a scheme although you can share it as an image, pdf or file * Once you create a scheme you will no longer be able to open another (they are not saved) # PRO Version # (1 - In-App Purchases) * You will be able to open, edit and save a scheme * Open in the following examples (link) ------------- * More examples: https://drive.google.com/drive/folders/1W6HFnDNsZAZonUlPn5tEPEnbZOuACjxN?usp=sharing
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Keyguard | Hydraulic schemes |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | — | 76.9% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.3 — better | 11.0 |
| Further details — not scored | ||
| Size | 22 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Miguel Maximiliano Vanzetti | Angel Martinez |
Customer experience
Keyguard
Hydraulic schemes
In-app purchases
Keyguard
No in-app purchases
Hydraulic schemes
- Remove ads, save/edit diagram$3.99









