What's the best camera app for iphone 4

I just got an iphone 4. I used the default camera to take some pics and was not very pleased with the picture quality. I looked on line at some sample pics from iphone 4 and the quality looks better than what I'm getting.

Will an app give me better picture quality or just more features? If it will give better quality which one is the best that is fairly cheap or free.

Instagram.

Retrica or cam wow, I use them all the time

The best thing that will increase your image quality is you. Your decisions of the lighting will have a dramatic influence on image quality. You need to be conscious of both the quality of the light and the quantity. Quality of light is referring to the direction, whether the light is hard (i.e. Bright sunny day) or soft (overcast day or during sunrise or sunset). The best time to photograph outside is during the golden hours of sunrise and sunset. Because phones use such small sensors, they have small pixels which are notorious for producing images with a lot of noise and for having very low dynamic range. Therefore you need to make sure you photograph under conditions with an ample amount of light AND make sure to use the lowest ISO setting possible. Increasing the ISO is best way to get a ton of ugly noise in your shots. High-ISO images also produce lower contrast, and lower color quality, too. Another thing that improves image quality is composition. Look up the Rule of Thirds and use that as a guide for composing your images. While not a perfect solution, the Rule of Thirds is probably the quickest and easiest way to improve the look of your images. Cameras within phones often cost about $8- that's it! So it's no wonder why it can be so difficult to get good image quality, but it's not impossible as you've seen. Because of the simple design and low-quality of cameras in smartphones *(even the $1,000 iPhone X uses a $25 camera), you have to cognizant of its capabilities and its shortcomings. As I've always said, 80% of what goes into making a great photo happens outside of the camera. Look for great and ample lighting, use the Rule of Thirds as a starting point in your composition, and you'll see a dramatic improvement in your photos regardless what device you're using.