Comparison

iCircuit vs Sketch Simply

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

Head to head
About

iCircuit

Design and simulate analog and digital electronic circuits in real-time. This app offers a comprehensive component library, built-in test equipment, and the ability to create custom elements. It's ideal for learning, prototyping, and validating designs without physical components.

Highlights
  • Real-time circuit simulation
  • Extensive component library (300+)
  • Built-in test equipment (multimeter, oscilloscope)
  • Programmable Arduino and PIC microcontroller support
  • Custom element creation and sharing
  • Audio simulation
Features
Read full description

iCircuit is the premier iPhone and iPad app for designing, simulating, and learning analog and digital electronics. Its advanced simulation engine provides real-time, always-on analysis so your circuits stay powered and live, just like working with real components. Use it like a CAD tool: add components, wire them up, and set their properties. But iCircuit is unlike typical CAD apps because it is always simulating. You do not stop to take a measurement or spend time configuring reports. Instead, you just play with the circuit as you normally would, with the power on. Build circuits with over 300 components, from simple resistors and LEDs to programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32), Raspberry Pi Pico boards running real MicroPython and CircuitPython, PIC microcontrollers, and 60 4000/7400-series digital ICs (more available with Pro). Connect elements, adjust values, and instantly see the results. BUILT-IN TEST EQUIPMENT • Multimeter: Probe any point to read voltage, current, and power • Oscilloscope: Track multiple signals with touch-controlled time scale, stacked/unstacked views, FFT analysis, and Bode plots • Gauges: Visualize voltages, currents, and frequencies directly in your circuit • Signal generators and configurable sources EXTENSIVE COMPONENT LIBRARY • Raspberry Pi Pico and Pico 2 running genuine MicroPython and CircuitPython firmware • Programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32) • Programmable PIC microcontrollers (assembly and HEX files, more available with Pro) • Power: Voltage regulators (78xx, LM317), sources, dependent sources, power jacks, and simulated antennas • Analog: Resistors, capacitors, inductors, diodes, BJTs, MOSFETs, thermistors, triodes, and tetrodes • Digital: Logic gates (AND, OR, NAND, NOR, XOR), JK and D flip-flops, and 60 4000/7400-series ICs (180+ available with Pro) • ADCs and DACs • Sensors and displays: LEDs, 7-segment, NeoPixels, matrix displays, thermistors • Electromechanical: Motors, servos, SPST/SPDT and DPST/DPDT switches, push buttons, relays, and speakers SPICE, VERILOG, AND VHDL Import vendor SPICE models and subcircuits and use them as components. Write Verilog or VHDL in the HDL element and wire it to the rest of your circuit. CREATE CUSTOM ELEMENTS Build sub-circuits and custom elements to componentize your designs and create reusable modules. Share your custom elements with others via the iCircuit Gallery. AUDIO SIMULATION Hear your circuits. Speakers, buzzers, and microphones produce real audio output. Perfect for students learning electronics, hobbyists prototyping projects, and engineers validating designs, all without burning out a single component. ABOUT ICIRCUIT PRO (OPTIONAL) iCircuit is a complete app with a one-time purchase. iCircuit Pro is optional and adds extra components (including more PICs and a larger 4000/7400 IC library) and helps fund ongoing development. Pro is not required for core simulation or everyday circuit design. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sketch Simply

This app serves as a digital sketchbook for brainstorming, rough designs, and idea recording. It offers Apple Pencil support to prevent accidental touch drawings and automatically backs up and synchronizes sketches across devices via iCloud. Archived books can be shared as PDFs or used for collaboration.

Highlights
  • Digital sketchbook for ideas and designs
  • Apple Pencil support for precise drawing
  • Automatic iCloud backup and synchronization
  • Share sketches as images or PDF archives
  • Collaborative whiteboard feature via AirPlay
  • Draw in color with an in-app purchase
Features
Read full description

Use SkBk for brainstorming, rough design sketches and making a record of your ideas. Indicate if you're using an Apple Pencil in order to avoid inadvertent hand, wrist, knuckle and finger touch drawings. With an iCloud account, your sketches and archives will be backed up automatically. You'll never lose your sketches. Archived books can be shared to other PDF reading apps. What's more, with an iCloud enabled account, your sketches and archives will be synchronized across all your iCloud enabled devices. Use Air Play on your iPad or iPhone to an Apple TV and use it as a white board for collaboration. Then share the images or pages with the collaborators and others. Features: Draw on a single page in portrait, or on two pages at once in landscape orientation. Undo prior strokes. Defaults automatically to use iCloud to back up and synchronize your sketch book across devices. This preference can be turned off in the Settings app. Indicate the use of the Apple Pencil for improved drawing, eliminating unintended strokes between hand touches and the Apple Pencil touches. Share your drawings as images, your pages¹ with other SkBk users, and your archives¹ with other people or PDF capable apps. Draw in color¹. Menu of options: - Share an image. - Share a page. - Enable Undo. - Draw in color.¹ - Archive a book of sketches as a PDF document. Books can have up to 122 pages. - View and manage book archives. Books can be individually shared¹ and removed from the archives. Footnotes: 1) Selecting color drawing requires a one time in app purchase.

Screenshots

iCircuit4 screens
Sketch Simply4 screens

Verdict

The call

The clearest difference is price: Sketch Simply at $0.99 against iCircuit's $12.99. Sketch Simply also leads on update cadence (every 11 days vs every 4 weeks). iCircuit's advantage is rating (3.9 vs 3.6) and ratings volume (146 vs 5). On ads, in-app purchases, device support and iOS requirement 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 costs $12.99 and Sketch Simply $0.99 up front. iCircuit sells 2 in-app purchases, starting at $1.99 per month and Sketch Simply sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

iCircuit holds the better App Store score, 3.9 against 3.6. That said, the two scores are not equally well evidenced: iCircuit has 146 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 61% of iCircuit's written reviews are positive against 50% of Sketch Simply's.

UpkeepUpdate frequency

iCircuit ships an update every 4 weeks, Sketch Simply every 11 days. The most recent releases landed on November 1, 2026 and October 18, 2026 respectively.

Scorecard6 real differences · 4 level
iCircuit versus Sketch Simply: the parameters behind the verdict, then further details
ParameteriCircuitSketch Simply
Price$12.99$0.99 — better
Rating3.9 (146 ratings) — better3.6 (5 ratings)
Positive reviews61.1% of reviews — better50.0% of reviews
Number of ratings146 — better5
Update frequencyEvery 4 weeksEvery 11 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.0
Further details — not scored
Size179 MB1 MB
Age rating4+4+
DeveloperKrueger Systems, Inc.Montiel Mobile, LLC

Customer experience

iCircuit

All ratings135 ratings
Positive68.1%
Neutral4.4%
Negative27.4%
Written reviews682 reviews
Positive61.1%
Neutral12.6%
Negative26.2%

Sketch Simply

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Bugs and requests

iCircuit

Reported bugs

4 issues
  • Oscilloscope and meter functions not working properly
  • Saving and loading circuits can be unreliable
  • Inconsistent behavior when rotating/flipping components
  • Crashes when working with larger or more complex circuits

Requested features

5 requests
  • More components (e.g. transformers, triodes, MOSFETs)
  • Ability to create custom components
  • Frequency domain analysis (Bode plots, FFT)
  • Improved wiring and component placement controls
  • Better support for AC circuits and motors

Sketch Simply

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

iCircuit

Subscriptions2
  • iCircuit Pro (Monthly)$1.991 Month
  • iCircuit Pro (Yearly)$14.991 Year
1 purchases

Sketch Simply

One-time1
  • Draw in Color$2.99

Questions

Is iCircuit free?
iCircuit costs $12.99, and also offers in-app purchases.
Is Sketch Simply free?
Sketch Simply costs $0.99, and also offers in-app purchases.
Which has better reviews, iCircuit or Sketch Simply?
iCircuit is rated higher. iCircuit averages 3.9 out of 5 from 146 ratings, while Sketch Simply averages 3.6 from 5 ratings.
Do iCircuit or Sketch Simply have ads?
Neither iCircuit nor Sketch Simply shows ads.
Which is updated more often, iCircuit or Sketch Simply?
iCircuit ships an update every 4 weeks, and Sketch Simply every 11 days. Most recently, iCircuit was updated on November 1, 2026 and Sketch Simply on October 18, 2026.

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