OPark vs Project Engineer

OPark lets user pay for parking at participating parking locations across Australia.

Project Engineer is a complete engineering toolkit for iPhone and iPad: hundreds of technical calculators across the disciplines you actually use, in one clean, fast, results-focused app. No more juggling spreadsheets, textbooks, lookup tables, and one-off websites. Enter your inputs and get clear, instantly readable results, with the theory and equations behind every answer. INSTANT METRIC ↔ IMPERIAL Switch any input or result between metric and imperial units with a single tap. No re-typing, no manual conversions. Every value updates on the spot. BUILT FOR REAL ENGINEERING WORK Project Engineer spans civil, structural, environmental, mechanical, electrical and more, for example: - Manning's equation for pipe and open-channel flow - Hydraulics, hydrology & stormwater - Structural steel, reinforced concrete & connections - Geotechnical, foundations & retaining walls - Thermodynamics, heat transfer & fluid mechanics - Roads, traffic & geometric design - Electrical, building services & acoustics - Mathematics, numerical methods & statistics - Solar position & PV sizing …and many more, with new calculators on the way. SEE THE WORKING Every calculator includes a theory section with the governing equations, variable definitions and reference sources, so you can see exactly how a result was reached and check it against your own working. LIVE-DATA TOOLS (PREMIUM) A standout you won't find in ordinary calculator apps: calculators that pull real-world climate and environmental data from live sources to give site-specific results, including rainwater tank sizing, irrigation demand, reservoir yield and pond-level exceedance. Turn textbook formulas into answers grounded in the real conditions at your location. DESIGNED FOR CLARITY & SPEED - Instant metric/imperial switching on every value - A consistent, distraction-free layout so the answer is always front and centre - Fast, on-device calculations - Save your results and sync them across devices - Mark favourites for the tools you use most SIMPLE, FAIR PLANS - Free: a selection of calculators to get started - Pro: the full standard library, unlimited saved results, favourites, and cloud sync - Premium: everything in Pro, plus live-data tools and early access to new features WHO IT'S FOR Practising engineers, designers, drafters, technicians, and engineering students who want dependable calculations without the clutter, at the desk or in the field. Project Engineer is a calculation aid. Results should be checked and applied by a suitably qualified person in line with the relevant codes and standards. Project Engineer continues to improve based on your feedback. Have a request or spotted something? Reach us anytime through the in-app contact form. Subscriptions are auto-renewable and billed through your Apple ID; they renew unless cancelled at least 24 hours before the period ends, and you can manage or cancel anytime in your device settings. Terms of Service: https://projectengineer.app/terms Privacy Policy: https://projectengineer.app/privacy