Thortful
What I love about Thorful as a designer, is that I can see my sales each day to keep track, to see if a card is likely to sell or if it's time to remove it and make space for something new. You're given five slots to start with, which you can then email to ask for more spaces if your cards start selling. It's then down to their discretion whether they give you more slots and if so how many. They've always been pretty quick to respond by email and lovely, but I do wish there was an option on the website to quickly request extra slots to save admin for us and them, so hopefully that option will come one day. In terms of sales, these can be easily tracked as a whole and by individual designs, so it's really easy to keep track and this helps decide what things work for future designs. I love that you can update a design easily and delete cards you want to remove from sale with the click of a button, though they do take up space in the background once deleted, so you may have to email to sort that too. Payment is always quick and easy, though PayPal take a chunk so hopefully bank transfer will be an option at some point too. The negatives for me are the waiting times for having cards reviewed for the site. Currently I've had some cards sat there for 6 plus weeks, and sometimes they are set to profile only which means they will not show up on the main site for searches. This is fine, but sometimes you wait weeks to hear your design has been rejected and it really slows down the opportunity to design more and of course earn money for ourselves as well as them. The site is super busy and successful which is amazing, so I'm sure they will speed up over time too as they grow and invest more into the website. I often ucards from there and the quality is incredible, so it's highly recommended as a seller and designer. See my Thortful cards by clicking here.
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Wuzci
I only signed up for Wuzci a few weeks ago, so I'm still counting sales on one hand! So far though, as a designer, it's a lovely site to use, easy to upload designs and very quick to authorize them which I love! Sales can be tracked easily and although I'm yet to be paid, I hear from other designers that they've never had issues. The site is very user friendly and shows me what I need to, so - so far so good. I really hope this is a successful site for my designs, as the cards are square as opposed to rectangular which I find a lot nicer to design for. As a buyer, this is a subscription based site, so I don't know if this will be good sales wise or not? I'll update soon with how things are going, but if you're a designer I'd recommend getting into Wuzci and giving it a try. See my Wuzci cards by clicking here.