What are some alternatives?
When comparing RNI Films and Filtron, you can also consider the following products
infltr - Discover Infinite Filters for every Picture!
CSSGram - Recreate Instagram filters with CSS filters and blend mode
Helium Core - A case that turns your iPhone into a real filmmaking tool 🎥
BitCam - The world's most advanced camera for your pocket computer
Microsoft Pix - Take better photos with the intelligent app from Microsoft.
Carbon - Create and share beautiful images of your source code.