Hydraulic Engineer vs Lists
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hydraulic Engineer
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.
- 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
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HYDRAULIC ENGINEER is the most comprehensive hydraulic engineering calculator available on the App Store, featuring over 1,000 formulas across 13 specialized calculator categories, 8 temperature scale converters, and 8 professional reference tables. CALCULATOR CATEGORIES - Actuator Formulas — cylinder force, stroke, speed, and rod calculations - Fluid Power — pressure, flow, horsepower, and torque calculations - Pump Laws — affinity laws for speed, flow, pressure, and power - Vehicle Drive — drive speed, tractive effort, gradeability, and drawbar pull - Hydraulic Tubing — wall thickness, burst pressure, and working pressure - Cylinder Calculations — extend/retract speed, rod end area, and cycle times - Thermal Hydraulics — heat generation, reservoir cooling, heat exchangers, and energy to heat fluid - Oil Velocity & Pressure Loss — pipe velocity, pressure drop per foot, and total system losses - Pipe Flow — Reynolds number, Darcy-Weisbach head loss, laminar friction, and orifice flow - Accumulator Sizing — discharge volume, precharge pressure, adiabatic and isothermal gas volumes - Reservoir Sizing — open/closed circuit sizing, cylinder-based sizing, and oil weight calculations - AC/DC Electrical — Ohm's law, power, resistance, inductance, and motor selection - Area Formulas — 60 geometric area calculations for every common shape 700+ CONVERSION FORMULAS Pressure, horsepower, BTU, flow rates, linear measure, square measure, cubic measure, liquid measure, weights, watts, power, HVAC, metric, sand-to-volume, and fraction conversions. 8 TEMPERATURE SCALES Convert between Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, and Romer — 56 conversion formulas covering every combination. 8 PROFESSIONAL REFERENCE TABLES - Pipe Schedule (Schedule 40 & 80) - ISO Viscosity Grades - Recommended Flow Velocities - Hydraulic Hose Sizing (SAE) - JIC Thread Sizes - Pipe Roughness Values - O-Ring Sizes (AS568) - Wire Rope Working Load Limits KEY FEATURES - Save and share any calculation result - Share reference tables - Calculation history - Favorites for quick access to your most-used formulas - Switch between US Customary and SI Metric units - Dual-unit display shows both US and metric values simultaneously - Dark mode optimized interface - Works offline — no internet connection required PREMIUM UPGRADE Unlock sharing, advanced calculator sections, and unlimited history with a one-time lifetime purchase — no subscriptions. HYDRAULIC ENGINEER is designed for working hydraulic engineers, technicians, maintenance professionals, and engineering students. If there are formulas or reference tables you'd like to see added, just use the built-in feedback feature to let us know.
Lists
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.
- Multi-level outlining
- Rich-text formatting
- Optional AI assistant
- Seamless cross-device sync
- Export to PDF, Word, HTML
- Password protection for folders
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Lists is a user-friendly app designed for everyone who enjoys simplicity when it comes to organizing thoughts, planning projects, making lists, and writing notes. Whether you're a writer, student, project manager, or anyone who consistently works on intricate tasks, our app will help boost your productivity and streamline your ideas. Main Key Features: - User-friendly Interface: Designed for easy use, Lists comes with an intuitive interface where you can navigate, make entries, and review your created outline with ease. - Multi-level Outlining: Lists allows creating notes with multiple levels of detail; you can drill down to as many sub-levels as you want. - Optional AI Assistant to generate content for lists, summaries, essays, translations, blog posts, poems, emails, songs, quizzes, tests, memos, recipes, and so much more. - Rich-text formatting: Bold, italic, underline, highlight, subscript/superscript, alignment, line and paragraph spacing, first-line indent, page breaks, footnotes, comments, text and paper color, etc. - Create unlimited notebooks, folders and nested subfolders. - Protect individually your folders/notebooks with a password, very useful for iPads with more than one user in office, classroom or home. - Seamless Sync: Syncs effortlessly across all your iOS devices, making your outlines available anytime, anywhere. - Customizable Themes: Personalize your experience with a variety of themes and make the space truly yours. - Integrated Search: Find specific information quickly and easily using our state-of-the-art search and filter feature. - Export & Import Options: Need your outlines in other formats? Export to PDF, Word, HTML, and more. You can also import data from other formats. Lists presents you with a canvas for your thoughts, providing the perfect platform to plot your narrative, plan your project, or just jot down your thoughts in a clear and concise way. If you so choose, the included AI Assistant can perform tasks for you: • Easily generate automatically lists, summaries, essays, blog posts, poems, emails, songs, quizzes, tests, memos, recipes, and so much more. • Ask anything to our smart AI assistant, it's got your answers. • Nail perfect writing with built-in spell checking and grammar fixes. • Boost your vocab with a killer dictionary full of definitions, synonyms, and antonyms. • Make your writing better by analyzing sentence structures with no sweat. • Use the handy translation feature which supports heaps of languages, solving any language issues. • Talk and write in over 50 languages with our handy assistant. • Spin up travel plans, recipes, step-by-step guides, quizzes, tests, memos, essays, histories, poems, you name it. • Speech Recognition: Talk or type, either way we have smooth conversations. Try Lists today to bring clarity to your thoughts and productivity to your day! Privacy Policy http://www.noteswriter.com/Kairoos_Privacy_Policy.html EULA https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This app requires users to have a subscription to unlock all the features after a 3-day risk-free trial.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Hydraulic Engineer | Lists |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | 2.5 (2 ratings) |
| Positive reviews | 25.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 | 16.4 — better |
| Further details — not scored | ||
| Size | 19 MB | 248 MB |
| Age rating | 4+ | 4+ |
| Developer | Historycentral.com | Kairoos Solutions SL |
Customer experience
Hydraulic Engineer
Lists
In-app purchases
Hydraulic Engineer
- Hydraulic Pro$3.99
Lists
- Unlock All including AI3 Days trial$1.991 Month
- Outliner Lifetime Pro Upgrade$3.99









