Coil Genius is a tool to calculate coils of wire around a cylindrical rod/bit, e.g. to be used in RBAs (rebuildable atomizers).


- Visual coil editor
- Keyboard-less design
- Supports SI (metric) and USCS (imperial) units
- Shows resistance, wire length, surface, coil width & weight
- Kanthal, Nichrome, Stainless, Titanium & Nickel wires
- Single/Dual/Triple/Quad coils
- Parallel/Twisted wire (two strands)
- AWG or mm (diameter) wire sizes
- Power simulation
- Set voltage/amperage range supported by your Mod in settings
- Shows voltage & amperage at coil
- Displays heat-up rate and heat flux
- Adjust temperature for temperature sensing coils (Titanium/Nickel)
- Save your favorite coils for later use
- Share your coils via Mail, Twitter, Facebook, ...
- Custom Wire Types (In-App Purchase)

What's New

Version 2.4

Minor changes

Ratings and Reviews

The Essential Coil Building App

RazorQueen Ulka

I’ve been using this app for some time and in building for temp control mode. It’s all I use and works great. I got some new wire once that wasn't in the app, but I researched its properties and added into the app. I consider it an essential app for coil building. I like the interface. It’s easy to use and gives all the specs in a clean fashion.

Developer Response




Had been using FireWrap but it didn't have the wire types I needed such as nickel200. This app has nickel200 and many others. Haven't found the need for the in-app purchase of custom wire types so don't let the in-app purchase in the description scare you from buying this app. It is fully functional from what I can tell for the initial $2 price. Very friendly interface after a couple settings adjustments to suit my needs such as increasing amperage threshold, wire size from mm to awg, and voltage threshold. Easy to understand and use for my dual and quad coil builds. So far the app has been spot on with its measurements after checking my builds on an ohm meter. This app is a must have if you build sub ohm coils. Surprised there are no other reviews yet as this app is purely awesome and people should rate it as such.

A must have App

Today's Vapor

I've been using this app for about 3 months and I use it every day. I'm a compulsive rebuilder so even good coils get switched out in favor of an even better one, hopefully. This app really helps to take the guesswork out of the planning phase. I use Steam Engine on the computer and for more complex builds, but this in many ways improves on that. It is very simple and intuitive to use, plus it automatically calculates Ohms law while you tweak your coil preference. This is extremely helpful when building for a mech mod. It is also very accurate, so I don't get any surprises when I put my deck on the tester.
Thank you for this essential tool.


Bugan IT Consulting UG (haftungsbeschraenkt)
15.4 MB
Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, German
Age Rating
Rated 4+
© 2015 Odysseus Software GmbH
In-App Purchases
  1. Custom Wire Types $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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