This app was mentioned in 3 comments, with an average of 1.33 upvotes
My eJuice Lab seems to be well reviewed, and the developer is a regular here on this subreddit.
This post by him is currently on the front page of the sub...
I'll throw my hat into the mix I've created an android app that has most of the features requested above, including inventory tracker which will also state if you haven't got enough of a concentrate before you start mixing
saves recipes
gives notifications when steeping is done
calc by weight & volume
Fully adjustable base & nic ratio
Few other features too and future features I'm currently working on
https://play.google.com/store/apps/details?id=com.sjhdevelopment.shaunharrison.myejuiceapp
I'll throw my hat into the mix I've created an android app which has some pretty useful features,
including inventory tracker which will also state if you haven't got enough of a concentrate before you start mixing
saves recipes
gives notifications when steeping is done
calc by weight & volume
Fully adjustable base & nic ratio
Few other features too and future features I'm currently working on
https://play.google.com/store/apps/details?id=com.sjhdevelopment.shaunharrison.myejuiceapp