Comparison

iCircuit 3D vs School Practice Lock

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

Head to head
About

iCircuit 3D

Design, build, and test electronic circuits in a realistic 3D environment. This app offers a virtual workbench with over 150 simulated parts and tools to experiment with circuits, diagnose issues, and visualize component behavior.

Highlights
  • 3D virtual workbench
  • Real-time circuit simulation
  • 150+ physically simulated parts
  • Realistic component behavior
  • Magic smoke failure simulation
  • Import custom 3D models
  • Symbolic component library
Features
Currently charting
Read full description

iCircuit 3D gives you an endless virtual workbench to design, build, and test electronics projects in 3D. It combines the robust real-time, always-on simulation engine of iCircuit with modern 3D rendering and physics on iOS and macOS. Do not let the availability of physical parts limit your creativity. Choose from an expansive library of 150+ physically and electronically simulated parts and over 1,000 reference boards to plan layouts, wire circuits, test ideas, and iterate fast. It also includes the full standard component library from the original iCircuit, so you can switch between realistic parts and symbolic circuit elements whenever you want. When powered, LEDs light up realistically, DC motors spin, and speakers make noise. Watch current flow along your simulated wires. See pinouts and color codes directly on components. Tap any part to view live values like voltage and current, then change parameters instantly. If you miswire something or overstress a component, magic smoke will billow from the point of failure so you can quickly diagnose and fix the problem. Add reference photos to the environment, import your own 3D models to mount projects onto, or use Blocks to build enclosures, panels, and simple structures. FEATURES • Tons of resistors, capacitors, and LEDs • Multiple breadboards and wiring elements • Diodes, BJTs, MOSFETs • DC power supplies • Waveform generators (AC, square, sawtooth) • Batteries (AA, AAA, 18650, coin cells, and more) • Switches (SPST, SPDT) • Buzzers and speakers • DC motors and servos • Programmable Arduino elements • The full symbolic iCircuit library (standard components included) • 1,000+ reference circuit boards for layout planning (not fully simulated) • Import board layouts from Eagle (imported layouts are for wiring/layout reference and do not simulate) • Import custom 3D models to attach your projects to, and simulate their behavior on the workbench • Import images for reference or documentation and place them as physical photographs HOW IT WORKS Add parts to the 3D workbench and they land on the table with gravity. Drag parts around, then draw wires between ports to connect them. When a circuit is completed, it starts simulating immediately. Wires stay connected as you move parts, so you can build tidy panels and enclosures, or leave parts scattered like a real bench. iCircuit 3D was designed for fun and exploration, with plenty more to discover as you build. I hope you enjoy this new take on circuit software.

About

School Practice Lock

Practice unlocking combination locks virtually before tackling real ones. Features include setting custom combinations, a helpful guide, and augmented reality to interact with your actual lock.

Highlights
  • Set any combination
  • Helpful unlocking guide
  • AR mode for actual locks
  • Virtual lock practice
Features
Read full description

We've created the ultimate solution for unlocking those tricky combination locks. Now, you can practice on our app before having your own! Features Include: -Set any combination -Helpful guide on how to unlock -*NEW* Use AR to unlock your ACTUAL lock! Get this app today and start unlocking like a pro.

Screenshots

iCircuit 3D4 screens
School Practice Lock4 screens

Verdict

The call

The clearest difference is price: School Practice Lock at $0.99 against iCircuit 3D's $12.99. School Practice Lock also leads on review sentiment (67% vs 41%). iCircuit 3D's advantage is rating (4.1 vs 1.9) and update cadence (every 8 months vs every 50 months). On ads, in-app purchases and monetization model 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

iCircuit 3D costs $12.99 and School Practice Lock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

iCircuit 3D holds the better App Store score, 4.1 against 1.9. That said, the two scores are not equally well evidenced: iCircuit 3D has 72 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 41% of iCircuit 3D's written reviews are positive against 67% of School Practice Lock's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iCircuit 3D ships an update every 8 months, School Practice Lock every 50 months. The most recent releases landed on November 3, 2026 and November 11, 2026 respectively.

Scorecard8 real differences · 3 level
iCircuit 3D versus School Practice Lock: the parameters behind the verdict, then further details
ParameteriCircuit 3DSchool Practice Lock
Price$12.99$0.99 — better
Rating4.1 (72 ratings) — better1.9 (10 ratings)
Positive reviews40.8% of reviews66.7% of reviews — better
Number of ratings72 — better10
Update frequencyEvery 8 months — betterEvery 50 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#195 — better—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size142 MB4 MB
Age rating4+4+
DeveloperKrueger Systems, Inc.Contractor Pro Software LLC

Customer experience

iCircuit 3D

All ratings72 ratings
Positive75.0%
Neutral8.3%
Negative16.7%
Written reviews49 reviews
Positive40.8%
Neutral14.3%
Negative44.9%

School Practice Lock

All ratings10 ratings
Positive20.0%
Neutral0.0%
Negative80.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Bugs and requests

iCircuit 3D

Reported bugs

21 issues
  • Wheels fly upwards when attached
  • Crashes often
  • Components flip, turn or move easily
  • Wrong component added when tapping
  • App freezes when creating templates
Show 16 more
  • Settings don't apply to new projects
  • Drops components on workspace
  • Components respond randomly to signals
  • Difficult to select components
  • Select wrong component
  • Details appear multiple times
  • Context sensitive menus are hit or miss
  • Teases out of the application
  • Needs bug fixes
  • Ability to sort, filter, and search for components
  • App crashes when rearranging wires
  • Object inference not set to an instance of object
  • Zener diode smokes
  • Constant crashes
  • Autosave feature barely works
  • Program locks up

Requested features

27 requests
  • Add search function for vertical mode
  • Fix buggy wheels when attaching
  • Improve camera angle control
  • Add option to follow moving objects
  • Add option to hold objects in place
Show 22 more
  • Improve 7-segment display behavior
  • Add Snap To Grid option
  • Option to turn off fake physics
  • Add Arduino implementation that works
  • Add multimeter tool
  • Allow adding own components
  • Add double throw relays
  • See voltage and current across components
  • Raspberry Pi simulation
  • Add components to circuit boards
  • Rotate components
  • Link Wikipedia to info
  • Add Teensy boards
  • Add serial console output
  • Add MIDI interface to iOS
  • Lock components onto the desk
  • Improve movement of components
  • Add a free version with limited use
  • Export and import projects between 2D and 3D apps
  • Share projects like on GitHub
  • View lists of top projects
  • Competitions and similar options

School Practice Lock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iCircuit 3D

No in-app purchases

None

School Practice Lock

No in-app purchases

Questions

Is iCircuit 3D free?
iCircuit 3D costs $12.99, with no in-app purchases.
Is School Practice Lock free?
School Practice Lock costs $0.99, with no in-app purchases.
Which has better reviews, iCircuit 3D or School Practice Lock?
iCircuit 3D is rated higher. iCircuit 3D averages 4.1 out of 5 from 72 ratings, while School Practice Lock averages 1.9 from 10 ratings.
Do iCircuit 3D or School Practice Lock have ads?
Neither iCircuit 3D nor School Practice Lock shows ads.
Which is updated more often, iCircuit 3D or School Practice Lock?
iCircuit 3D ships an update every 8 months, and School Practice Lock every 50 months. Most recently, iCircuit 3D was updated on November 3, 2026 and School Practice Lock on November 11, 2026.

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