# Password Guard vs HydroCalc Plus

The clearest difference is review sentiment: HydroCalc Plus at 100% against Password Guard's 38%. HydroCalc Plus also leads on ads (none vs shown). Password Guard's advantage is price (Free vs $3.99) and iOS requirement (9.0 vs 15.1). On update cadence, in-app purchases and device support there is nothing between them.

Password Guard is free to download; HydroCalc Plus costs $3.99 up front. Password Guard sells 1 one-off in-app purchase and HydroCalc Plus sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Password Guard ships an update monthly, HydroCalc Plus every 3 weeks. The most recent releases landed on September 16, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | Password Guard | HydroCalc Plus |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 37.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 23 MB | 34 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexandr Lobanov](https://appshunter.io/developer/448738599) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Password Guard

[App page](https://appshunter.io/ios/app/password-guard/id537138395)

Securely store all your login credentials in an encrypted vault, protected by a master password. Generate strong, unique passwords for each account and manage your data with features like backup and theft protection.

**Highlights:** Encrypted password vault, Built-in password generator, Theft protection, Database backup, Text encrypter/decrypter, Password history

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Password Guard Premium | $0.99 | one-time |


### HydroCalc Plus

[App page](https://appshunter.io/ios/app/hydrocalc-plus/id578807688)

A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.

**Highlights:** Friction head loss calculation (Hazen-Williams), US and SI unit support, Extensive pipe material library, Fittings and valves database, Inverse calculation mode, Real-time results (velocity, losses)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Power Calculator | $1.99 | one-time |
| System Curve Generator | $1.99 | one-time |
| Pipe Database | $1.99 | one-time |
| Industrial Fluids Pack | $2.99 | one-time |


## Frequently asked questions

### Is Password Guard free?

Password Guard is free to download, with in-app purchases available.

### Is HydroCalc Plus free?

HydroCalc Plus costs $3.99, and also offers in-app purchases.

### Do Password Guard or HydroCalc Plus have ads?

Password Guard shows ads; HydroCalc Plus does not.

### Which is updated more often, Password Guard or HydroCalc Plus?

Password Guard ships an update monthly, and HydroCalc Plus every 3 weeks. Most recently, Password Guard was updated on September 16, 2026 and HydroCalc Plus on August 31, 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.*