# Hydraulic Engineer vs Lists

The clearest difference is review sentiment: Lists at 100% against Hydraulic Engineer's 25%. Lists also leads on price (Free vs $4.99) and update cadence (every 3 weeks vs every 6 months). Hydraulic Engineer's advantage is rating (4.0 vs 2.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Lists is free to download; Hydraulic Engineer costs $4.99 up front. Hydraulic Engineer sells 1 one-off in-app purchase and Lists sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Hydraulic Engineer holds the better App Store score, 4.0 against 2.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews complicate that: 25% of Hydraulic Engineer's written reviews are positive against 100% of Lists's, so the app with the better star average is not the one people write more warmly about.

Hydraulic Engineer ships an update every 6 months, Lists every 3 weeks. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Hydraulic Engineer | Lists |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/lists-nested-lists-and-more/id6471313799/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 19 MB | 248 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Kairoos Solutions SL](https://appshunter.io/developer/978066434) |

## What reviewers say

### Hydraulic Engineer

[App page](https://appshunter.io/ios/app/hydraulic-engineer/id410465591)

This comprehensive calculator app offers over 1,000 hydraulic engineering formulas across 13 categories. It includes temperature conversions, reference tables, and the ability to save and share calculations. Works offline and supports both US Customary and SI Metric units.

**Highlights:** Over 1,000 hydraulic formulas, 13 specialized calculator categories, Temperature scale converters, Professional reference tables, Save and share calculations, Works offline, US Customary and SI Metric units

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydraulic Pro | $3.99 | one-time |


### Lists

[App page](https://appshunter.io/ios/app/lists-nested-lists-and-more/id6471313799)

Organize thoughts, plan projects, and write notes with an intuitive outliner. Features multi-level outlining, rich text formatting, and an optional AI assistant for content generation and translation. Seamlessly syncs across devices and offers export options.

**Highlights:** Multi-level outlining, Rich-text formatting, Optional AI assistant, Seamless cross-device sync, Export to PDF, Word, HTML, Password protection for folders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All including AI | $1.99 | per month |
| Outliner Lifetime Pro Upgrade | $3.99 | one-time |


## Frequently asked questions

### Is Hydraulic Engineer free?

Hydraulic Engineer costs $4.99, and also offers in-app purchases.

### Is Lists free?

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

### Which has better reviews, Hydraulic Engineer or Lists?

Hydraulic Engineer is rated higher. Hydraulic Engineer averages 4.0 out of 5 from 1 ratings, while Lists averages 2.5 from 2 ratings.

### Do Hydraulic Engineer or Lists have ads?

Neither Hydraulic Engineer nor Lists shows ads.

### Which is updated more often, Hydraulic Engineer or Lists?

Hydraulic Engineer ships an update every 6 months, and Lists every 3 weeks. Most recently, Hydraulic Engineer was updated on September 26, 2026 and Lists on September 28, 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.*