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CRUMB

by Vital Group Limited

  • Productivity
  • Paid
  • Zombie
  • Small & simple · 90
View on the App Store
Rating
4.4
144 ratings · US storefront
Top 91%among 116 Productivity apps
Last update
Aug 29, 2022
Version 1.0.3
Size
520 MB
Category
Productivity
Tracked since
Oct 10, 2026

Estimated revenue

A model estimate with a likely range, not a reported figure.

No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.

How this estimate is made

Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.

Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.

Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.

Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.

Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.

Full method

Screenshots

As shown on the App Store listing.

About this app

Text from the App Store listing.

CRUMB offers an easy to use and interactive introduction to electronic circuits

Fully realised in 3D, you can construct prototype circuits as you would at the workbench without the risk of terminal component failure or the hassle of ordering individual components

CRUMB comes with a great selection of components to allow you to jump straight in to creating prototype circuits

With the catalogue available, it is possible to study the workings of transistors & audio filtering, all the way to programming an EEPROM to run a basic program

For the beginner, it is possible to learn and understand the basics of interactivity, and for the enthusiast it is possible to analyse and perfect prototypes before constructing real world models

Using the built in oscilloscope and analysis views, it is possible to see clearly the interaction between components from within the wires themselves

Through community feedback and suggestion, there will be many more components and features added. For a full feature list and development schedule please visit the website http://www.crumbsim.com

What’s new

Release notes for the latest version, as written by the developer.

v1.0.3

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

Rank history

Daily position in the Ecuador charts. #1 is at the top.

Best rank
#1
Current rank
#1
Days charting
7 of 7

On the charts today

Small & simple score

How realistic it is for a small team to build something like this.

90/100

Small & simple

  • Developer size100% · 25

    Developer: 1 app on the charts

  • Audience size100% · 20

    Ratings: 144

  • App size0% · 10

    Size: 520 MB

  • Price model100% · 15

    Price model: paid

  • Demand proof100% · 30

    Best rank #1, 21 countries

An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2

How the score works

Version history

  • 1.0.3LatestReleased Aug 29, 2022