For info , this mail I sent to Zappiti since they seem to through the years to ignore the need for acceptable subtitles:
Hi Zappiti.

In most of Northern Europe, subtitles are used on all foreign films, perhaps 80 percent of films shown. I have written to you before on this topic, and there have been posts on your forum, about subtitles on Zappiti. My inquiries have not led to anything, nor the posts that have been on your forum. Subtitles on Zappiti are actually useless. You can not see them at the different backgrounds of the movies. A dark background or white font with a black outline is missing. I have now myself downloaded a third-party app for my Zappiti, a foreign media player, which has a LOT of options with subtitles, dark background and loads of possibilities. It works fine on Zappiti. So it CAN be done with a Zappiti. But the downside is a lousy user interface compared to the Zappiti media player. One have to surf around in the stupid Android environment.

It simply cannot be right that you do not want to solve this problem. You have a fantastic product, but with the huge disadvantage that no efforts have been made to create subtitles that are as good as on all the cheap Android devices, the ones that cost 30-40 euros. Please inform the developers on this issue. I expect a response to this inquiry!

Best wishes