This app was mentioned in 5 comments, with an average of 1.40 upvotes
Are you vaping off the shelf liquid or mixing your own? If you gradually reduce your nic by say 0.5mg/ml every week or two, I don't think you'd notice much difference.
You could get some USP or BP grade PG or VG and dilute down what you have using the mixing section of this app https://play.google.com/store/apps/details?id=org.boggi.esig
I began buying a bulk order from this guy, along the lines of this:
Extremely good service and good value to get you started off. You will need to add some flavours to that order, but he has a load of Hanseng ones to get you started.
Edit: Just noticed he has a range of flavours at the bottom the page linked above.
I have moved on to buying flavours and nicotine separately as I know exactly what I need.
Depending on what device you have I recommend a mixing calculator. If you have Android then this is what I use:
If you aren't using Android then there are a few great sites that do the same job, google them.
With regard to recipes. I mainly stick to one/two flavours at a time. The side bar here is superb, a great array and very straightforward to make. It of course all depends on your tastes.
In general, DIY is a larger investment at the start, but in the long run its much more economical. From a personal perspective, it would really bug me paying for liquid, that is the essentially the same quality/ingredients that I use, but at a massive markup.
If you have any other questions I'd be happy to answer, if I can.
I get my pg and vg from amazon, quart size bottles(personally I get 3, a bottle of pg and vg I mix 50/50, then a quart of vg I use to bump my vg up to 70%). 10ml and 1ml syringes from amazon, glass droppers for some flavorings as well(some flavorings don't come with a dropper top), also got my 10 and 30ml bottles from amazon, I mix on smaller scale(like 10-30ml) so I use syringes for pg and vg and measure flavorings and nicotine in drops(I use a 10ml bottle full of nicotine, works good. Just make sure to mark it or something, as would be bad to drip it or fill a tank with it). Nicotine I get from nude nicotine(I use 100mg 50/50), flavorings from bullcityflavors
If you have android, this ejuice calculator works pretty nice and is simple
I use this app for android that works nice for both mixing juice as well as changing mix ratios and such. Been using it for awhile and I like it. Not sure if there's any good apps on apple though. It's got the "simple" tab at the top of the app for one flavor quick ejuice mixing, then has got the "Mixer" tab for mixing different liquids like raising or diluting nicotine or a flavor and has got other uses as well. I used the mixer tab for finding out how to get 70% vg when using my premixed 50/50 pg/vg(just 4ml vg, 6ml premix per 10ml) as i've been making 50/50 for stuff like my subtank and goliath and was dripping it for awhile too until I started liking 70 vg for dripping and my tf rta so used that part of the app to keep my 50/50 premix but be able to bring up the vg % if I want. Simple tab is great for making ejuice quick and easy
This is the one is use. It's nice and simple and let's you store recipes. The only thing that I don't like is that the advanced calculator requires that you put at least 2% water in the recipe, but since it's by weight I just add that to my VG so it's not a big deal. The simple calculator doesn't do that so my guess is that it's a coding error.