# Compare Flow vs Hydraulic

The clearest difference is in-app purchases: Compare Flow at none against Hydraulic's 2. Compare Flow also leads on rating (4.6 vs 4.2). Hydraulic's advantage is update cadence (every 6 weeks vs every 32 months) and ratings volume (16 vs 5). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Hydraulic sells 2 one-off in-app purchases. Compare Flow asks for nothing beyond the download.

Compare Flow holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 5 and 16 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

Compare Flow ships an update every 32 months, Hydraulic every 6 weeks. The most recent releases landed on September 17, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Compare Flow | Hydraulic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/compare-flow/id581217854/reviews)** | [4.2 (16 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews) |
| Number of ratings | 5 | **16** |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 24 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iENGINEERING Corporation](https://appshunter.io/developer/419618955) | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) |

## What reviewers say

### Compare Flow

[App page](https://appshunter.io/ios/app/compare-flow/id581217854)

This application helps engineers and designers evaluate the hydraulic flow capacity of various non-pressure sewer pipe types. It allows for comparisons between different pipe geometries and materials, including concrete, thermoplastic, and metal options.

**Highlights:** Manning's Formula calculation, Compare hydraulic flow capacity, Evaluate pipe geometry alternatives, Compare pipe material options, Supports concrete, thermoplastic, and metal pipes, Circular, elliptical, arch, and box sections

**Features:** macOS Compatibility

**In-app purchases:** none


### Hydraulic

[App page](https://appshunter.io/ios/app/hydraulic-calculator/id612615039)

Perform essential hydraulic calculations for cylinders, pumps, and fluid lines. Solve for forces, speeds, torque, power, and pressure drop. Supports metric and imperial units, with advanced features unlocked via in-app purchase.

**Highlights:** Cylinder force and speed calculations, Pump displacement, flow, and pressure calculations, Hydraulic line fluid velocity and pressure drop, Orifice flow and pressure calculations, Speed, torque, and power calculations, Metric and imperial unit support, Copy results to clipboard

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $7.99 | one-time |
| Pro Version | $7.99 | one-time |


## Frequently asked questions

### Is Compare Flow free?

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

### Is Hydraulic free?

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

### Which has better reviews, Compare Flow or Hydraulic?

Compare Flow is rated higher. Compare Flow averages 4.6 out of 5 from 5 ratings, while Hydraulic averages 4.2 from 16 ratings.

### Do Compare Flow or Hydraulic have ads?

Neither Compare Flow nor Hydraulic shows ads.

### Which is updated more often, Compare Flow or Hydraulic?

Compare Flow ships an update every 32 months, and Hydraulic every 6 weeks. Most recently, Compare Flow was updated on September 17, 2026 and Hydraulic on June 4, 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.*