1. Home
  2. 📊 Productivity
  3. CRUMB
CRUMB

CRUMB

Interactive Circuit Simulation

138 ratings
33 reviews
#127 in paid Productivity
📚 Education
📊 Productivity
$7.99

Details

  • Released
  • Updated
  • March 15, 2023
  • August 29, 2022

Features

Developer

Vital Group Limited
✨Promote your app ✨
CRUMB screenshot #1 for iPhone
CRUMB screenshot #2 for iPhone
CRUMB screenshot #3 for iPhone
CRUMB screenshot #4 for iPhone
iphone
ipad
📉no. 127
Charts↘︎
📌Ready
Reviews summary↘︎
⭐33
Reviews↘︎
📝1+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦w/o updates
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

Explore and build electronic circuits in an interactive 3D environment. Learn circuit basics, experiment with components, and analyze performance with built-in tools without the risk of damaging real parts.

✓Interactive 3D circuit construction
✓Wide selection of electronic components
✓Study transistors and audio filtering
✓Program EEPROMs
✓Built-in oscilloscope and analysis views
✓Prototype analysis before real-world construction
Show original description

What users say

Summarized from real user reviews of CRUMB. Based on 138 reviews and a 4.4/5 average, it highlights the 15 positives and 38 negatives reviewers mention most about this Productivity app.

Positive things

  • 👍Great for beginners
  • 💡Good for learning new skills
  • ✨Simple to put things together
  • 🎨Great graphics
  • 🧩Plenty of components
  • 🚀Fantastic simulator
  • ✅Intuitive interface
  • 💯Well-implemented simulation tool
  • 🌟Amazing for learning electronics
  • 📱Great for on-the-go circuit design
  • 🚀Next level circuit design
  • 💯Well-made app
  • 👍Best simulator
  • 👍Outstanding STEM app
  • 💡Great value for cost

Negative things

  • ❌Very limited components
  • ❌Lacks modern components
  • 🐛Crashing frequently
  • 🐛App crashes when using corners
  • 🐛Crashing on Mac
  • ❌Terrible program design
  • ❌Fighting the program
  • ❌Limited logic chips
  • ❌No way to expand chip availability
  • ❌Beta release feel
  • ❌No power supply option
  • ❌No tutorials
  • ❌Doesn't work for professionals
  • ❌Lacks basic beginner tools
  • ❌Math doesn't add up
  • ❌Calculations don't match real life
  • ❌Beginners beware
  • ❌Needed amplifier, not available
  • 🐛Bugs need fixing
  • 🐛Component images don't rotate
  • 🐛Power rails backwards
  • 🐛Program counters don't reset
  • 🐛EEPROM corrupts data
  • 🐛Transistor images lock
  • 🐛Buttons/switches react unintentionally
  • ❌App crashes with too many components
  • ❌Limited memory capacity
  • ❌Rotation broken on app version
  • ❌Clunky interface
  • ❌Difficult component placement
  • ❌Not worth the price
  • ❌UI is subpar
  • ❌No manual included
  • ❌Touch controls flaky
  • ❌Tedious on phone/iPad
  • ❌Weird rotations/positions
  • ❌Not intuitive dip switch
  • ❌No refund option
See all reviews

What's New in CRUMB

1.0.3

August 29, 2022

Version 1.0.3 Updates: · Camera touch controls · Undo/Remove Point functionality when creating wired components · Breadboards and Power Rail can be snapped together · The Scope window can now be moved around the screen Bug Fixes: · LED and Capacitor bodies now correct orientation on first point · Power Supply outline after rotation · LED simulation oscillation fix

More

Charts

Top Paid

📉 127-22

Productivity

This app dropped -22 positions in Productivity chart.

Last updated on October 14, 2026.

User reviews

Most RecentHighest RatedLowest Rated

CRUMB

“Very” limited in the number of devices available.
I am not impressed. In fact I want my money back.
12345Cowboy1234512345Cowboy12345

Would improve is you put modern components

Would like to see implementation of Texas Instruments IC or LTC series to.
Trini_591Trini_591

Been crashing a lot recently

I find that the app crashes when using the “corners” option on jumper wires
FREEŻAFREEŻA

Just what I was looking for.

As an absolute beginner hungry for a new hobby and after a lot of searching I think I have found the perfect space to learn a new skill. I love the simplicity of putting things together and seeing how they react. The graphics are great and there are plenty of components to play with. This is a great resource and I’m very grateful to the guy who put it together.
Show more
dustyaxedustyaxe

Terrible program design

I feel like I’m fighting the program instead of using it!!!
Simair1Simair1
See 28 more reviews

Developer apps

TETRON
TETRON

Hex-Block puzzle game

🎮 Games

(3)

Free
In-App Purchases
See developer apps

User experience

🐞

Reported Bugs

11 issues

App crashes when using the “corners” option on jumper wires

Bug

Experienced some crashing on Mac

Bug

Component images do not rotate

Bug

Power rails are backwards related to real life breadboards

Bug

Program counters (74HC161) do not reset to 0 on a reset signal

Bug

74HC245 enable pin should be labeled active low but it’s not

Bug

EEPROM sometimes corrupts the data saved in the HEX editor

Bug

Many components, most commonly the transistor, lock their image in place even if deleted

Bug

Buttons and switches will react to touching the screen even when not touching the component location

Bug

Rotation is broken on the app version

Bug

UI can be a little flaky at times

Bug
✨

Requested Features

31 requests

Implement modern components (TI IC, LTC series)

Feature

Add 12 segment display

Feature

Add Arduino and other microcontrollers

Feature

Add a spot to code Arduino/microcontrollers

Feature

Allow custom wire colors

Feature

Create circuit boards with custom colors

Feature

Add pre-made circuit boards

Feature

Ability to create custom electronic components from circuits

Feature

Improve corner-to-corner wire mode for breadboard/power rail connection

Feature

Add snap rotations and positions

Feature

Add CD4511 component

Feature

Add oscilloscope

Feature

Add signal generator

Feature

Add BJT transistors

Feature

Add op amp

Feature

Add MOSFETs

Feature

Add transformers

Feature

Add relays

Feature

Add AC power supply

Feature

Add music player for amplifier learning

Feature

Add more examples of classic circuits

Feature

Simulation pausing

Feature

Add hotkeys to desktop version

Feature

Add resistance monitoring view

Feature

Allow push buttons to be placed across rails

Feature

Add 'Show Pins' view to app version

Feature

Add schematic feature

Feature

Add manual

Feature

Add more functions and components

Feature

Add more examples

Feature

PC integration

Feature

FAQ

What does CRUMB do?

CRUMB is an interactive 3D electronic circuit simulator. It allows users to build and experiment with electronic circuits without the need for physical components or the risk of damage. It's designed for both learning the basics and for enthusiasts to prototype and analyze designs.

What are the key features of CRUMB?

Key features include interactive 3D circuit construction, a wide selection of components, the ability to study complex components like transistors and audio filters, and even program EEPROMs. It also provides built-in analysis tools like an oscilloscope to visualize circuit behavior.

Is CRUMB free to use?

Yes, CRUMB is available for free. The application does not have any in-app purchases or advertisements, making it a completely free tool for users.

Who is CRUMB designed for?

CRUMB is suitable for a broad audience. Beginners can use it to learn and understand the fundamental principles of electronic interactivity. Enthusiasts can leverage it to analyze and perfect circuit prototypes before committing to real-world construction.

Can I use CRUMB to test complex circuits?

Yes, CRUMB supports the study of complex circuits, including transistors and audio filtering. It also allows for the programming of EEPROMs to run basic programs, enabling users to test and analyze more advanced functionalities.