# Perfboard > Electronics hobbyist reference and utility tools for calculations and data. (iPhone/iPad app by Soft Dorothy LLC.) - Source: https://appshunter.io/ios/app/perfboard/id465951871 (this page in markdown: same URL + `.md`) - Developer: [Soft Dorothy LLC](https://appshunter.io/developer/457535512) - Category: Reference, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 6 App Store ratings · 24 written reviews indexed - Age rating: 4+ - Requires: iOS 7.1 · 10 MB - Languages: American English - Released: 2011-09-23 - Data updated: 2026-06-04 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/perfboard/id465951871/reviews.md ## What is Perfboard? A utility and reference for the electronics hobbyist. Contains: • resistor color band utility • resistor series calculator • resistor parallel calculator • voltage divider • capacitor code tool • capacitor tolerance reference • capacitor series calculator • capacitor parallel calculator • L.E.D. voltage drop reference • L.E.D. limiting resistor calculator • Ohm's law calculator (with unique "slide rule mode") • ASCII table. Retina display and iPhone 5 & 6 support. A beautiful user interface. ## Key features - Resistor color band utility - Resistor and capacitor calculators - Voltage divider calculator - LED limiting resistor calculator - Ohm's law calculator - ASCII table ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Perfboard Professional Suite | $1.99 | one-time | ## Recent user reviews (10 of 24) All indexed reviews: https://appshunter.io/ios/app/perfboard/id465951871/reviews.md ### 5/5 — Abandoned? *2023-02-26, version 2.0.4* Been trying ti buy the paid version for a long time. Apple wont let me do it. I believe this app has been abandoned by its dev. Too bad, looks like its the best thing out there ### 3/5 — Why Perfboard? *2021-06-14, version 2.0.4* The app is very very basic. It’s a nice little app though that covers the very basics of Ohms Law. There’s a bit about resistor colour codes and caps. A nice touch is the info about LEDs and voltage dividers. To be fair; there’s enough info here for you to keep the magic smoke inside an LED and get it to light up, and in all honesty that’s where the journey begins. There’s no point in scaring people with circuit analysis, truth tables and sketches. ### 5/5 — Great! Except for 1 Ohm *2021-01-16, version 2.0.4* Very handy... Worth the small price to unlock other features. NOTE: There is one bug, the app reports a 1 ohm resistor as a 10k resistor... Only issue I have found.. ### 5/5 — Just the Job *2018-12-23, version 2.0.4* Just realised I had not written a review yet, but have to say it is just the job for me being a casual user of this stuff and never remembering the calculations as I have a head like a sieve. Very handy having the ability to do the calculations on the fly. I note it hasn’t been updated for a while, so I do hope it will continue to work. I’m on IOS 12.1.3 and it works fine. ### 5/5 — Very Nice *2018-07-23, version 2.0.4* This is a very cool app, I’ve purchased the Pro Version and I recommend you to do the same, you’ll get more useful tools that I am sure you’ll enjoy 😊 Keep up the good work!! @Ed Rivera ### 5/5 — Wow this is great! *2018-01-29, version 2.0.4* Cannot saw enough. As a hobby electronics builder I can not believe how well this app works. I use the LED and resistor function the most. ### 1/5 — Crashes on my iPod 5th gen *2016-01-05, version 2.0.4* Shows menu/home screen for split second then goes black. Same every time. Not yet Able to use the app ### 5/5 — Excellent app and creator (vaper friendly) *2015-06-06, version 2.0.2* I can't speak enough how well the app works and looks. Puts all others in the realm to shame. Another plus is now with a watts counter, coil builders can now build within safe limits. A must have for any vaper out there. This came as a suggestion to the creator who is more than willing to hear you out. Simply amazing! Highly recommended. ### 5/5 — Simple and useful *2013-10-29, version 2.0.1* Simplicity ### 5/5 — Very handy, good interface, works well *2013-02-24, version 1.1.0* I'll pick up electronics for a while, then get busy with other things, and not pick it up for a few months. This app is well designed, just enough reference information, and I found the LED voltage limit calculator really useful. ## Frequently asked questions about Perfboard ### What calculations does Perfboard offer? Perfboard offers calculations for resistor color bands, resistor and capacitor series/parallel values, voltage dividers, and LED limiting resistors. It also includes an Ohm's law calculator with a unique slide rule mode. ### Is Perfboard free to use? Yes, Perfboard is free to download and use. The app does have in-app purchases available. ### What devices does Perfboard support? Perfboard supports iPhone and iPod devices. It is optimized for Retina displays and larger screens like those on iPhone 5 and 6. ### How often is Perfboard updated? The latest version, 2.0.4, was released on November 25, 2015. Previous updates indicate a history of feature additions and compatibility improvements. ### What is the age rating for Perfboard? Perfboard has an age rating of 4+, making it suitable for a wide range of users, including younger hobbyists. ### Does Perfboard work offline? As a reference and utility tool, Perfboard's core functions are designed to work without an internet connection, making it useful in various environments. ### What is the user sentiment for Perfboard? Perfboard has received excellent user feedback, indicated by a perfect 5.0-star rating from 6 reviews. ### Can Perfboard help with component identification? Yes, Perfboard includes a resistor color band utility and capacitor code tool to help identify electronic components. ## Version history (last 5 releases) ### 2.0.4 — 2015-11-25 This app has been updated by Apple to display the Apple Watch app icon. General bug fixes. ### 2.0.3 — 2015-06-06 Added "power" (Watts) to Ohm's Law calculator. Fixed a potential crash in the Ohm's Law calculator. New "flat style" icon. ### 2.0.2 — 2014-05-14 • Address text layout issues with iOS7 ### 2.0.1 — 2013-04-01 Fixed Professional suite. ### 2.0.0 — 2013-03-25 An Ohm's Law calculator with a unique "slide rule mode" for entering the values. A suite of new Professional features include a voltage divider and series and parallel calculators for both resistors and capacitors. ## Apps similar to Perfboard | App | Rating | Price | Category | | --- | --- | --- | --- | | [Time calculator ( Converter )](https://appshunter.io/ios/app/time-calculator-converter/id919839640) | — | Free | Reference | | [inspectAR PCB Tools](https://appshunter.io/ios/app/inspectar-pcb-tools/id1478936899) | 3.4 (9) | Free | Reference | | [New Jersey Attorney](https://appshunter.io/ios/app/new-jersey-attorney/id853868760) | 4.5 (2) | Free | Reference | | [TdSE](https://appshunter.io/ios/app/tdse/id1483912060) | — | Free | Reference | | [Multimetco Catalog](https://appshunter.io/ios/app/multimetco-catalog/id1538018380) | 3.7 (3) | Free | Reference | | [CUE RetailX](https://appshunter.io/ios/app/cue-retailx/id1493148420) | — | Free | Reference | ## Related topics [capacitor](https://appshunter.io/ios/topics/capacitor) · [flux capacitor](https://appshunter.io/ios/topics/flux-capacitor) --- *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 2026-06-04.*