What are some alternatives?
When comparing Lenka and RNI Films, you can also consider the following products
Carbon - Create and share beautiful images of your source code.
infltr - Discover Infinite Filters for every Picture!
Hueless - High-quality black & white photos from your phone
Filtron - Create and share your own photo filters on Mac & iPhone
TinType by Hipstamatic - Create vintage self portraits w/ Hipstamatic's new photo app
CSSGram - Recreate Instagram filters with CSS filters and blend mode