# CRUMB — Interactive Circuit Simulation > Interactive 3D electronic circuit simulator for learning and prototyping. (iPhone/iPad app by Vital Group Limited.) - Source: https://appshunter.io/ios/app/crumb/id1639868071 (this page in markdown: same URL + `.md`) - Developer: [Vital Group Limited](https://appshunter.io/developer/1355662516) - Category: Productivity, Education - Price: $7.99 - Rating: 4.40/5 from 138 App Store ratings · 33 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 496 MB - Languages: English - Released: 2023-03-15 - Data updated: 2026-08-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/crumb/id1639868071/reviews.md ## What is CRUMB? 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 ## Key features - 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 ## Chart rankings - #127 in Top Paid · Productivity (US App Store) ## Recent user reviews (10 of 33) All indexed reviews: https://appshunter.io/ios/app/crumb/id1639868071/reviews.md ### 1/5 — CRUMB *2026-01-30, version 1.0.3* “Very” limited in the number of devices available. I am not impressed. In fact I want my money back. ### 1/5 — Would improve is you put modern components *2026-01-24, version 1.0.3* Would like to see implementation of Texas Instruments IC or LTC series to. ### 2/5 — Been crashing a lot recently *2025-09-18, version 1.0.3* I find that the app crashes when using the “corners” option on jumper wires ### 5/5 — Just what I was looking for. *2025-08-18, version 1.0.3* 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. ### 1/5 — Terrible program design *2025-08-09, version 1.0.3* I feel like I’m fighting the program instead of using it!!! ### 2/5 — Let down *2025-06-10, version 1.0.3* There are limited, single-category logic chips available with no way to expand the availability of different types of chips. This product seems more like a Beta release than a charge to use product. ### 5/5 — Fantastic simulator despite a few quirks *2025-01-13, version 1.0.3* I’ve been using this simulator to follow the Ben Eater 8 bit computer series and I absolutely love this app. There’s a few quirks that you may run into but the fixes are rather straightforward at least for the iPad version. I’ve experienced some crashing on Mac which has been frustrating but overall, I’m in love! ### 2/5 — Need improvements *2024-09-22, version 1.0.3* Can’t plug power supply, no tutorials how to use it ### 5/5 — Can you add a 12 segment display? *2024-04-26, version 1.0.3* Seven segment display is fine, but it can’t support letters ### 5/5 — Great App but it was abandoned *2024-04-12, version 1.0.3* Great app but no updates or fixes in over a year ## Frequently asked questions about CRUMB ### 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. ## Version history (last 3 releases) ### 1.0.3 — 2022-08-29 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 ### 1.0.1 — 2022-08-17 Category change: Utilities to Productivity ### 1.0 — 2022-08-16 No release notes. ## Apps similar to CRUMB | App | Rating | Price | Category | | --- | --- | --- | --- | | [BLE Scanner 4.0 – Bluetooth LE](https://appshunter.io/ios/app/ble-scanner-40-bluetooth-le/id1221763603) | 4.3 (615) | Free | Productivity | | [Electronics Engineer Helper](https://appshunter.io/ios/app/electronics-engineer-helper/id896429646) | 4.8 (432) | Free | Productivity | | [SLD \| Electrical diagrams](https://appshunter.io/ios/app/sld-electrical-diagrams/id1534899128) | 4.1 (132) | $1.99 | Productivity | | [Network Toolbox Net security](https://appshunter.io/ios/app/network-toolbox-net-security/id651691453) | 4.6 (3,303) | Free | Productivity | | [Electrical Engineering: Quiz](https://appshunter.io/ios/app/electrical-engineering-quiz/id1330321712) | 4.9 (11) | Free | Productivity | | [Flexcil Note & Good PDF Reader](https://appshunter.io/ios/app/flexcil-note-and-good-pdf-reader/id1531466462) | 4.4 (391) | Free | Productivity | ## More apps by Vital Group Limited - [TETRON](https://appshunter.io/ios/app/tetron/id1481483851) All apps by Vital Group Limited: https://appshunter.io/developer/1355662516 ## Related topics [crumb](https://appshunter.io/ios/topics/crumb) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*