Comparison

Circuitry vs Engine Room Simulator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Circuitry

Build and simulate electronic circuits in an intuitive 3D environment. This app offers lightning-fast analysis and a user-friendly interface, making complex engineering accessible. Circuits are saved as documents for easy sharing and management across devices.

Highlights
  • 3D circuit building
  • GPU-accelerated analysis
  • Intuitive 3D interface
  • Document-based circuit files
  • Component placement and connection
  • Resistor, voltage source, light bulb components
Features
Read full description

Welcome to Circuitry - the world's first and only 3D circuit builder! INSANELY FAST Circuitry uses an optimized, GPU-accelerated network analysis algorithm that will blow your mind. It can calculate the voltages and currents of even the largest circuits in the blink of an eye - an insanely fast blinking eye! SUPER DUPER EASY TO USE While most circuit simulators are stuck in the stone age when it comes to usability, Circuitry takes you on a time-travel journey to the future. Its' 3D interface and intuitive controls will instantly feel familiar - no lengthy tutorials required. DOCUMENT-BASED Every circuit you build in Circuitry is a file. That way, they integrate perfectly into your existing files and can be used exactly the same way: you can duplicate and modify them, share them, and they are available to you on all your devices. HOW TO USE: 1. Place components by dragging from the toolkit to the canvas. 2. Connect components by tapping the sides of the components in cabling mode. 3. Delete or modify components by long pressing on them. AVAILABLE COMPONENTS: - Resistor - Voltage source - Light bulb

About

Engine Room Simulator

This app offers a high-fidelity simulation for marine engineering training. It allows users to practice shipboard engine-room procedures, from safety training to full voyage simulation, with clear guidance and feedback. Ideal for cadets, students, and seafarers to build practical skills anytime, anywhere.

Highlights
  • High-fidelity marine engineering simulation
  • PPE safety training and induction
  • Generator synchronization and startup
  • Full voyage simulation
  • Guided and assessment learning modes
  • Offline practice capability
Features
Read full description

Engine Room Simulator - ERS is a high-fidelity marine engineering training simulator for marine cadets, marine students, seafarers, and seamen who want to practice shipboard engine-room procedures with professional precision - anytime, anywhere, on mobile. Step into a realistic engine room and learn how a ship's machinery comes to life. From PPE safety training to generator synchronization to full voyage simulation, ERS turns complex marine engineering operations into repeatable, hands-on practice and onboard familiarization. MARITIME TRAINING, STEP BY STEP Work through guided engine room training modules with clear procedures, on-screen guidance, and instant feedback. This interactive training simulator builds from the fundamentals to full-plant operation - ideal for maritime education, competency training, and seafarer training. Practice the core shipboard systems: - PPE safety training and engine room safety induction - Emergency diesel generator cold-ship startup - Diesel Generator 1 and 2 starting - Diesel generator synchronization and paralleling - Seawater system and central seawater distribution - Freshwater system and cooling water system (LT/HT) - Lube oil system management - Fuel oil system pretreatment and service - Starting air system compressors and receivers - Boiler and steam plant operation - Marine diesel engine and engine startup training - Secure propulsion and propulsion control FULL VOYAGE SIMULATION Bring it all together in the Voyage Simulation hub - a connected engine room sandbox where shipboard systems and marine auxiliary systems operate at the same time. Perform system alignment training, manage the plant, handle electrical interlocks, and run the vessel like a real watchkeeping marine engineer. SAFETY FIRST, EVERY TIME Shipboard safety is built in. Complete your PPE and safety checks to unlock training modules, then gear up again every time you enter the engine room - just like real shipboard discipline. GUIDED AND ASSESSMENT LEARNING - Guided mode: a step-by-step narrator, on-screen pointers, and input gating help you learn each procedure correctly. - Assessment mode: an operations assessment with scoring and mistake tracking, unlocked once you complete the guided walkthrough. WHY ENGINE ROOM SIMULATOR - Built for marine cadets, marine engineering students, and working seafarers - Realistic P&ID-style shipboard system diagrams with pan and zoom - Authentic engine room operations, alarms, and trainer feedback - Premium, distraction-free full-screen interface - Practice marine engineering offline, on your own schedule - Repeatable drills and simulator practice to build muscle memory before you board Whether you are preparing for sea time, studying as a marine cadet, refreshing watchkeeping skills, or learning how a ship engine works, Engine Room Simulator - ERS is a complete marine simulator and ship systems simulator that gives you a safe, hands-on environment to learn, practice, and master engine room operations. ERS PRO Unlock the full marine engineering training experience, including all system modules and the complete Voyage Simulation, with ERS Pro. A yearly subscription and a one-time lifetime purchase are available. PRO OPTIONS • Pro Yearly: 1 year, auto-renewable subscription • Pro Lifetime: one-time purchase • Pro unlocks unlimited local saves and Pro-only features/components SUBSCRIPTION TERMS • Price is shown in your local currency before purchase • Payment is charged to your Apple ID at confirmation • Yearly Pro renews automatically unless canceled at least 24 hours before the end of the current period • Manage or cancel anytime in Apple ID account settings Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://electrosim.simlearningtech.com/privacy-policy

Screenshots

Circuitry4 screens
Engine Room Simulator4 screens

Verdict

The call

The clearest difference is rating: Engine Room Simulator at 4.8 against Circuitry's 3.9. Engine Room Simulator also leads on update cadence (every 3 weeks vs every 4 months). Circuitry's advantage is in-app purchases (none vs 2) and ratings volume (156 vs 4). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Engine Room Simulator sells 2 in-app purchases, starting at $9.99 per year. Circuitry asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Engine Room Simulator holds the better App Store score, 4.8 against 3.9. That said, the two scores are not equally well evidenced: Circuitry has 156 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

Circuitry ships an update every 4 months, Engine Room Simulator every 3 weeks. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

Scorecard6 real differences · 4 level
Circuitry versus Engine Room Simulator: the parameters behind the verdict, then further details
ParameterCircuitryEngine Room Simulator
PriceFreeFree
Rating3.9 (156 ratings)4.8 (4 ratings) — better
Positive reviews51.4% of reviews—
Number of ratings156 — better4
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size35 MB174 MB
Age rating4+4+
DeveloperRaffael KaehnLouie Juera

Customer experience

Circuitry

All ratings155 ratings
Positive68.4%
Neutral12.9%
Negative18.7%
Written reviews37 reviews
Positive51.4%
Neutral13.5%
Negative35.1%

Engine Room Simulator

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Circuitry

Reported bugs

6 issues
  • App crashes on launch
  • App doesn't work after download
  • Blank white screen on opening
  • App won't open, only shows a folder
  • Lights won't turn on
Show 1 more
  • Cannot close circuits properly

Requested features

14 requests
  • Add more components (diodes, transistors, capacitors, inductors, speakers, microphones, resistors, switches, LEDs, displays, transformers)
  • Add labels/names for components
  • Add intensity and voltage for cables
  • Add undo/redo buttons
  • Add tutorials or guidance videos
Show 9 more
  • Allow moving placed components
  • Add polarity for components
  • Add graphical representation of current flow
  • Add export of 2D schematic
  • Support DC and AC circuits
  • Allow use of virtual meters
  • Add oscilloscope function (graph vs time)
  • Improve UI intuitiveness
  • Add sample circuits

Engine Room Simulator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Circuitry

No in-app purchases

2 purchases

Engine Room Simulator

Subscriptions1
  • ERS Pro Yearly3 Days trial$9.991 Year
One-time1
  • ERS Pro Lifetime$19.99

Questions

Is Circuitry free?
Circuitry is free to download, with no in-app purchases.
Is Engine Room Simulator free?
Engine Room Simulator is free to download, with in-app purchases available.
Which has better reviews, Circuitry or Engine Room Simulator?
Engine Room Simulator is rated higher. Circuitry averages 3.9 out of 5 from 156 ratings, while Engine Room Simulator averages 4.8 from 4 ratings.
Do Circuitry or Engine Room Simulator have ads?
Neither Circuitry nor Engine Room Simulator shows ads.
Which is updated more often, Circuitry or Engine Room Simulator?
Circuitry ships an update every 4 months, and Engine Room Simulator every 3 weeks. Most recently, Circuitry was updated on October 21, 2026 and Engine Room Simulator on October 28, 2026.

Other comparisons