# HydroCalc Plus vs HelloTimer

The clearest difference is price: HelloTimer at Free against HydroCalc Plus's $3.99. HelloTimer also leads on update cadence (daily vs every 3 weeks). HydroCalc Plus's advantage is device support (3 vs 1). On rating, review sentiment, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for HydroCalc Plus against 5.0 for HelloTimer. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

HydroCalc Plus ships an update every 3 weeks, HelloTimer daily. The most recent releases landed on October 4, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | HydroCalc Plus | HelloTimer |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/hellotimer-all-in-one-timer/id6741063591/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 34 MB | 28 MB |
| Requires iOS | **15.1** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [海峰 陈](https://appshunter.io/developer/561392212) |

## What reviewers say

### 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 |


### HelloTimer

[App page](https://appshunter.io/ios/app/hellotimer-all-in-one-timer/id6741063591)

This app helps you build focus and rhythm with versatile timer functions. It supports multiple timers, background running, and real-time progress display on your lock screen or in a floating window. Track your time investment with detailed statistics for improved productivity.

**Highlights:** Multiple countdown and count-up timers, Dynamic Island and Lock Screen integration, Floating window mode (Picture-in-Picture), Background timer operation, Save and track timer sessions, Chart-based time statistics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TimerPlus Lifetime Unlock | $2.99 | one-time |


## Frequently asked questions

### Is HydroCalc Plus free?

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

### Is HelloTimer free?

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

### Which has better reviews, HydroCalc Plus or HelloTimer?

HydroCalc Plus and HelloTimer are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do HydroCalc Plus or HelloTimer have ads?

Neither HydroCalc Plus nor HelloTimer shows ads.

### Which is updated more often, HydroCalc Plus or HelloTimer?

HydroCalc Plus ships an update every 3 weeks, and HelloTimer daily. Most recently, HydroCalc Plus was updated on October 4, 2026 and HelloTimer on October 3, 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.*