# TVS Diode Array Product Selector vs Hydraulic

The clearest difference is review sentiment: TVS Diode Array Product Selector at 100% against Hydraulic's 50%. TVS Diode Array Product Selector also leads on rating (5.0 vs 4.2) and in-app purchases (none vs 2). Hydraulic's advantage is update cadence (every 6 weeks vs every 6 months) and ratings volume (16 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Hydraulic sells 2 one-off in-app purchases. TVS Diode Array Product Selector asks for nothing beyond the download.

TVS Diode Array Product Selector holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Hydraulic has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of TVS Diode Array Product Selector's written reviews are positive against 50% of Hydraulic's.

TVS Diode Array Product Selector ships an update every 6 months, Hydraulic every 6 weeks. The most recent releases landed on September 30, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | TVS Diode Array Product Selector | Hydraulic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tvs-diode-array-product-selector/id438716133/reviews)** | [4.2 (16 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews) |
| Number of ratings | 1 | **16** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 24 MB |
| Requires iOS | **8.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Littelfuse, Inc.](https://appshunter.io/developer/503818127) | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) |

## What reviewers say

### TVS Diode Array Product Selector

[App page](https://appshunter.io/ios/app/tvs-diode-array-product-selector/id438716133)

This app helps you find the right TVS Diode Array for your electronic circuits. It asks a few questions about your application to recommend the best product for ESD and lightning surge protection. You can also request samples and access datasheets.

**Highlights:** Product recommendation based on application needs, Sample requests, View product information and characteristics, Download datasheets, Access design resources

**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 TVS Diode Array Product Selector free?

TVS Diode Array Product Selector 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, TVS Diode Array Product Selector or Hydraulic?

TVS Diode Array Product Selector is rated higher. TVS Diode Array Product Selector averages 5.0 out of 5 from 1 ratings, while Hydraulic averages 4.2 from 16 ratings.

### Do TVS Diode Array Product Selector or Hydraulic have ads?

Neither TVS Diode Array Product Selector nor Hydraulic shows ads.

### Which is updated more often, TVS Diode Array Product Selector or Hydraulic?

TVS Diode Array Product Selector ships an update every 6 months, and Hydraulic every 6 weeks. Most recently, TVS Diode Array Product Selector was updated on September 30, 2026 and Hydraulic on September 23, 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.*