# HydroCalc Plus vs Habit Tracker & Capybara

The clearest difference is price: Habit Tracker & Capybara at Free against HydroCalc Plus's $6.99. Habit Tracker & Capybara also leads on update cadence (every 9 days vs every 3 weeks). HydroCalc Plus's advantage is iOS requirement (15.1 vs 18.0). On rating, review sentiment, ratings volume and ads there is nothing between them.

Habit Tracker & Capybara is free to download; HydroCalc Plus costs $6.99 up front. HydroCalc Plus sells 4 one-off in-app purchases and Habit Tracker & Capybara sells 3 in-app purchases, starting at $1.99 per month. 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 Habit Tracker & Capybara. 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, Habit Tracker & Capybara every 9 days. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | HydroCalc Plus | Habit Tracker & Capybara |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/habit-tracker-and-capybara-kapy/id6748405563/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 | **Every 9 days** |
| Monetization | Paid | **Freemium** |
| Size | 34 MB | 38 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [David Manso](https://appshunter.io/developer/1645844109) |

## 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 |


### Habit Tracker & Capybara

[App page](https://appshunter.io/ios/app/habit-tracker-and-capybara-kapy/id6748405563)

Build gentle routines and track progress towards your goals with a charming, stress-free habit tracker. Earn rewards for completing tasks and maintain cozy streaks with visual habit cards and home screen widgets. This app transforms self-improvement into a mindful and rewarding experience.

**Highlights:** Gentle routine building, Visual habit cards, Progress streaks, Personalized rewards, Home screen widgets, Built-in templates, Reminders

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kapy PRO Monthly | $1.99 | per month |
| Kapy PRO Yearly | $6.99 | per year |
| Kapy PRO Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is HydroCalc Plus free?

HydroCalc Plus costs $6.99, and also offers in-app purchases.

### Is Habit Tracker & Capybara free?

Habit Tracker & Capybara is free to download, with in-app purchases available.

### Which has better reviews, HydroCalc Plus or Habit Tracker & Capybara?

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

### Do HydroCalc Plus or Habit Tracker & Capybara have ads?

Neither HydroCalc Plus nor Habit Tracker & Capybara shows ads.

### Which is updated more often, HydroCalc Plus or Habit Tracker & Capybara?

HydroCalc Plus ships an update every 3 weeks, and Habit Tracker & Capybara every 9 days. Most recently, HydroCalc Plus was updated on October 21, 2026 and Habit Tracker & Capybara on October 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.*