It looks like they need a little bit of fertilizer.

Unfortunately your post is lacking in information...where are they planted, how much sunlight, what medium, when did you fertilize, etc If you can provide more specific information you can get help...

If still in that cup they seriously need a better medium and some fertilizer.

SCG

Pansies are one of my favorite annuals. The colors and varieties are beautiful. My experience with them has always been challenging. I don't feel I've yet mastered growing them but I try every year. I think my expectations are too high. I search the internet every year to see possible tips from others who are also starting pansies at home. Your seedling looks healthy to me. The leaves are not curled or yellow. Pansies grow slow, real slow. They also like to be grown in a cool environment. You may not think your seedling is a success but google pansy seedlings and images and look at how seedlings from other home growers look. They look similar. Most seedlings grown at home not by professionals look similar to the ones I've grown and what I see on the internet. Also, google pansy societies and see how the seedlings of members look and what tips they have. I had to remind myself that pansies from nurseries and garden centers in the spring may have been grown under conditions that home growers don't use. Many growers use growth regulator and chemicals to get those large healthy looking plants we buy in the spring and fall. I am also trying some again this fall but I started with some old and new seeds and don't know if any will germinate. As long as you provide the correct temperature, enough hours of light, and fertilize, you should have healthy seedlings in the spring Post again on how your seedlings do. I would enjoy seeing them.

Here is a link that might be useful: Bloom Where You're Planted-Urban Gardening in Philly

I just realized after reading your post again that you started your seeds in he summer. It's difficult to keep pansies cool enough during this time. I guess you started them for this fall. How did they do? Did you plant them out? If you start some for spring you may want to start earlier than suggested to give them a longer time to grow.